ENG: Diagnose a Check Engine Light and S/D4 errors.

[aero]

After 19,000 threads about how to do this, I decided there was a need for one of these. I thought there was one.. but I dunno. Motion to sticky ... mods if you wanna change the thread title to "how to .... " that would be kew.. i forgot to add that.

1. If your check engine light is on, start by going to your passenger side kickpanel.
There should be a blue connector w/2 wires to it like the one pictured below.


Put a paper clip, wire, connector in it to connect the two prongs.

2. Put the key in the ignition, and turn the key 2 clicks to the acc on, where all the lights light up on the dash.

3. You will now watch how many times the CEL light blinks.

a long blink = 10
a short blink = 1
It will repeat after all the codes are done.

4. Compare to this list to see what the problem is:

1 O2A - Oxygen sensor #1
2 O2B - Oxygen sensor #2
3 MAP - manifold absolute pressure sensor
4 CKP - crank position sensor
5 MAP - manifold absolute pressure sensor
6 ECT - water temperature sensor
7 TPS - throttle position sensor
8 TDC - top dead centre sensor
9 CYP - cylinder sensor
10 IAT - intake air temperature sensor
12 EGR - exhaust gas recirculation lift valve
13 BARO - atmospheric pressure sensor
14 IAC (EACV) - idle air control valve
15 Ignition output signal
16 Fuel injectors
17 VSS - speed sensor
19 Automatic transmission lockup control valve
20 Electrical load detector
21 VTEC spool solenoid valve
22 VTEC pressure valve
23 Knock sensor
30 Automatic transmission A signal
31 Automatic transmission B signal
36 traction control found on JDM ecu's
41 Primary oxygen sensor heater
43 Fuel supply system
45 Fuel system too rich or lean
48 LAF - lean air fuel sensor
54 CKF - crank fluctuation sensor
58 TDC sensor #2
61 Primary oxygen sensor
63 Secondary oxygen sensor
65 Secondary oxygen sensor heater
71 random misfire cylinder 1
72 random misfire cylinder 2
73 random misfire cylinder 3
74 random misfire cylinder 4
80 Exhaust Gas Recirculation insufficient flow detected
86 ECT Sensor (Engine Coolant Temperature) circuit range / performance problem
90 Evaporative Emission Control System leak detected in the fuel tank area
91 Fuel Tank Pressure Sensor low input
92 Evaporative Emission Control System insufficient purge flow



Resetting ECU

1. Disconnect Negative battery terminal (never only take off the positive, cuz it can kill the battery when it grounds all the power out, if left for a while)

2. Look in the Underhood fuse box, find the "Hazard" Fuse. Pull it out.

3. Let the car sit for 10-15 minutes

4. Reattach neg battery terminal and put fuse back in

5. Restart car w/nothing on (radio, lights, a/c) and just let it run for a few minutes.

6. Turn off, and then it should be good to go.

---------------------------------------------------------------------------

TCU Error codes are indicated by the "S" light on 90-91 models, and the "D4" light on 92-93 models. The codes can be read in the same way as the ECU codes with the paperclip method by counting the flashes of these lights. DO NOT replace the TCU without first checking the error codes. If the TCU is doing its job, the S/D4 light is indicating a properly reported code, and a new TCU will not fix your problem.
The error codes are as follows:

0-Transmission control unit (TCU) faulty.
1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

__________________________________________
ABS Error codes

I did a Google on ABS codes and all sources online seem to be incomplete. So here it goes, hopefully this is sticky-worthy. Note: the page numbers are as found in the Helms P/N 61SV405.

Also, it appears that these codes are the same for all pre-1998 Honda ABS/ALB systems. *1998+ Honda ABS systems use a different set of codes.

I’m pretty familiar with code 1-0, so I put a little extra info there.


Code 0-0

Symptom: ABS indicator light does not come on when ignition switch is turned ON

Probable Cause:
1. Blown Back-up Lights/Meter Lights (10A) fuse
2. Open circuit between the Back-up Lights/Meter Lights (10A) fuse and ABS indicator light
3. Blown ABS indicator light bulb
4. Open circuit between ABS indicator light bulb and ABS control unit
5. Open circuit between ABS control unit and body ground
6. Poor body ground
7. Faulty ABS control unit

Refer to page 19-64

Code 0-0

Symptom: ABS indicator light does not go off after engine is started

Probable Cause:
1. Blown R/C Mirror (7.5A) fuse
2. Open circuit between the Under-dash Fuse/Relay box and ABS control unit.
3. Open circuit between the battery and Under-hood ABS Fuse/Relay box
4. Blown ABS B2 (15A) fuse
5. Open circuit inside the Under-hood ABS Fuse/Relay box
6. Open circuit between the Under-hood ABS Fuse/Relay box and ABS control unit
7. Faulty Alternator
8. Open circuit between the alternator and ABS control unit
9. Short to body ground in the WARN circuit between the ABS indicator light and ABS control unit
10. Faulty ABS control unit

Refer to page 19-66

Code 1-0

Diagnosis: ABS pump motor over-run
The ABS indicator light is turned ON when the pump motor relay ON signal is detected for more than 40 seconds while the ABS is not functioning

Diagnostic Period: Initial & Individual

Possible Cause:
1. Air mixed in the ABS brake fluid; look for foamy fluid in reservoir
2. Pressure Switch stuck OFF; see if the pump comes on and runs until the light comes on without stopping where cause #5, 6, 7, 8, and 9 are not present
3. Open in circuit between the pressure switch and ASBS control unit
4. Open circuit in the P-SW circuit between the pressure switch and body ground, or a poor ground
5. Drop in pump discharge volume; look for pools of fluid under modulator
6. Leaking outlet valve; same as #5
7. Leaking relief valve; look for reservoir volume to drop and then gradually rise to its original level, triggering the pump to kick back on
8. ABS brake fluid leakage; same as #5
9. Faulty ABS control unit; same as #2 or if ABS Indicator Light comes on quicker than 40 seconds

Solutions (each number below corresponds to a Possible Cause above):
1. Bleed the system with fresh fluid
2. Remove ABS Modulator, remove back panel, clean bourdon tube switch.
3. Repair open with solder and shrink wrap
4. Same as #3
5. Replace failing seals
6. Same as #5
7. Replace the relief valve; good luck, I've got the same problem and have yet to find a good replacement
8. Same as #5
9. Replace the ABS control unit with known working unit and see if there is a change in the diagnosis

Refer to page 19-69

Code 1-2

Diagnosis: Pump Motor
The ABS indicator light is turned on when battery voltage is detected at the MCK terminal while the pump motor relay OFF signal is detected; OR the ABS indicator light is turned on when zero volts is detected at the MCK terminal while the pump motor relay ON signal is detected.

Diagnostic Period: Initial & Regular

Probable Cause:
1. Open circuit or short to body ground between the R/C Mirror (7.5A) fuse and Under-hood ABS Fuse/Relay box
2. Open circuit or short to body ground in the PMR circuit inside the Under-hood ABS fuse/Relay box
3. Faulty pump motor relay
4. Open circuit or short to body ground in the PMR circuit between the Under-hood ABS Fuse/Relay box and ABS control unit
5. Open circuit between the battery and Under-hood ABS Fuse/Relay box
6. Blown ABS Motor (40A) fuse
7. Blown ABS Unit (10A) fuse
8. Open circuit or short to body ground in the motor drive circuit and MCK circuit inside the Under-hood ABS Fuse/Relay box
9. Open circuit or short to body ground in the MCK circuit between the Under-hood ABS Fuse/Relay box and ABS control unit
10. Open circuit or short to body ground between the Under-hood ABS Fuse/Relay box and pump motor
11. Faulty pump motor
12. Open circuit between the pump motor and body ground or poor ground
13. Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the MCK circuit
2. Intermittent interruption in the pump motor relay drive circuit
3. Intermittent interruption in the pump motor drive circuit

Refer to page 19-71

Code 1-3

Diagnosis: High pressure leakage
The ABS indicator light is turned on when the frequent ON/OFF cycle of the pressure switch signal is detected, that is during the engine in motion. The count is erased when the ABS functions.

Diagnostic Period: Regular

Probable Cause:
1. Leaking outlet valve
2. Leaking relief valve
3. Poor contact in pressure switch circuit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the pressure switch
2. Intermittent interruption in the pressure switch circuit

Refer to page 19-77

Code 1-4

Diagnosis: Pressure switch
The ABS indicator light is turned on when the pressure switch ON signal is always detected at every initial diagnosis. The count is erased when the ABS control unit detects the pressure switch OFF signal.

Diagnostic Period: Initial

Probable Cause:
1. Short to body ground between the ABS control unit and pressure switch
2. Pressure switch stuck ON
3. Faulty ABS control unit

Refer to page 19-79

Code 1-8

Diagnosis: High pressure system
This diagnosis is performed when the pressure switch is OFF at the initial diagnosis. The pump motor is operated to turn the pressure switch ON, and then the solenoid valve is momentarily activated. The ABS indicator light is turned on if the pressure switch signal changes from ON to OFF.

Diagnostic Period: Initial

Probable Cause:
1. Accumulator gas leakage
2. Changed relief valve set pressure
3. Rear outlet solenoid valve late to close
4. Changed pressure switch set pressure

Probable Cause When Symptom Does Not Reappear:
1. The ABS indicator light may not come on in normal climate when it comes on in very cold climate.

Refer to page 19-80

Code 2-1

Diagnosis: Parking brake
The ABS indicator light is turned on when the parking brake ON signal is detected for more than 30 seconds while driving.

Diagnostic Period: Regular

Probable Cause:
1. Low fluid level in the master cylinder reservoir
2. Open circuit between the Back-up Lights/Meter Lights (10A) fuse and brake system light
3. Blown brake system light bulb
4. Open circuit or short to body ground between the brake system light and ABS control unit
5. Parking brake switch stuck ON
6. Short to body ground between the brake system light and parking brake switch
7. Brake fluid level switch stuck ON
8. Short to body ground between the brake system light and brake fluid level switch
9. Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Driving with the parking brake applied – (No problem)

Refer to page 19-81

Code 3-1

Diagnosis: Right-front Pulser
The ABS indicator light is turned on when the wheel sensor signal is periodically missing during driving.

Diagnostic Period: Regular

Probable Cause:
1. Chipped pulser gear
2. Improperly installed wheel sensor

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor

Refer to page 19-85

Code 3-2

Diagnosis: Left-front Pulser
The ABS indicator light is turned on when the wheel sensor signal is periodically missing during driving.

Diagnostic Period: Regular

Probable Cause:
1. Chipped pulser gear
2. Improperly installed wheel sensor

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor

Refer to page 19-85

Code 3-4

Diagnosis: Right-rear Pulser
The ABS indicator light is turned on when the wheel sensor signal is periodically missing during driving.

Diagnostic Period: Regular

Probable Cause:
1. Chipped pulser gear
2. Improperly installed wheel sensor

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor

Refer to page 19-85

Code 3-8

Diagnosis: Left-rear Pulser
The ABS indicator light is turned on when the wheel sensor signal is periodically missing during driving.

Diagnostic Period: Regular

Probable Cause:
1. Chipped pulser gear
2. Improperly installed wheel sensor

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor

Refer to page 19-85

Code 3-12

Diagnosis: Different diameter tire
The ABS indicator light may be turned on while driving when one, two or three different diameter tires are installed. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Regular

Probable Cause:
1. Different diameter tire installed

Probable Cause When Symptom Does Not Reappear: (No problem)

Refer to page 19-85

Code 4-1

Diagnosis: Right-front wheel sensor
The ABS indicator light is turned on when the wheel sensor signal is missing at speeds of 6 mph (10 km/h) or more. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Individual & Regular

Probable Cause:
1. Open circuit, internal short or short to body ground in the wheel sensor
2. Open circuit or short to body ground in the positive (+) wire between the wheel sensor and ABS control unit
3. Open circuit or short to body ground in the negative (-) wire between the wheel sensor and ABS control unit
4. Positive (+) wire shorted to the negative (-) wire between the wheel sensor and ABS control unit
5. Lose connector or poor contact of terminals
6. Improper wheel sensor air gap
7. Faulty ABS control unit
8. Missing pulser
9. Modulator does not decrease pressure properly

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Wheel spin of both front wheels (only for Code 4-8)) – (No problem)
3. The transmission downshifted excessively (only for Code 4-1 and 4-2) – (No problem)

Refer to page 19-86

Code 4-2

Diagnosis: Left-front wheel sensor
The ABS indicator light is turned on when the wheel sensor signal is missing at speeds of 6 mph (10 km/h) or more. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Individual & Regular

Probable Cause:
1. Open circuit, internal short or short to body ground in the wheel sensor
2. Open circuit or short to body ground in the positive (+) wire between the wheel sensor and ABS control unit
3. Open circuit or short to body ground in the negative (-) wire between the wheel sensor and ABS control unit
4. Positive (+) wire shorted to the negative (-) wire between the wheel sensor and ABS control unit
5. Lose connector or poor contact of terminals
6. Improper wheel sensor air gap
7. Faulty ABS control unit
8. Missing pulser
9. Modulator does not decrease pressure properly

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Wheel spin of both front wheels (only for Code 4-8)) – (No problem)
3. The transmission downshifted excessively (only for Code 4-1 and 4-2) – (No problem)

Refer to page 19-89

Code 4-4

Diagnosis: Right-rear wheel sensor
The ABS indicator light is turned on when the wheel sensor signal is missing at speeds of 6 mph (10 km/h) or more. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Individual & Regular

Probable Cause:
1. Open circuit, internal short or short to body ground in the wheel sensor
2. Open circuit or short to body ground in the positive (+) wire between the wheel sensor and ABS control unit
3. Open circuit or short to body ground in the negative (-) wire between the wheel sensor and ABS control unit
4. Positive (+) wire shorted to the negative (-) wire between the wheel sensor and ABS control unit
5. Lose connector or poor contact of terminals
6. Improper wheel sensor air gap
7. Faulty ABS control unit
8. Missing pulser
9. Modulator does not decrease pressure properly

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Wheel spin of both front wheels (only for Code 4-8)) – (No problem)
3. The transmission downshifted excessively (only for Code 4-1 and 4-2) – (No problem)

Refer to page 19-92

Code 4-8

Diagnosis: Left-rear wheel sensor
The ABS indicator light is turned on when the wheel sensor signal is missing at speeds of 6 mph (10 km/h) or more. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Individual & Regular

Probable Cause:
1. Open circuit, internal short or short to body ground in the wheel sensor
2. Open circuit or short to body ground in the positive (+) wire between the wheel sensor and ABS control unit
3. Open circuit or short to body ground in the negative (-) wire between the wheel sensor and ABS control unit
4. Positive (+) wire shorted to the negative (-) wire between the wheel sensor and ABS control unit
5. Lose connector or poor contact of terminals
6. Improper wheel sensor air gap
7. Faulty ABS control unit
8. Missing pulser
9. Modulator does not decrease pressure properly

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Wheel spin of both front wheels (only for Code 4-8)) – (No problem)
3. The transmission downshifted excessively (only for Code 4-1 and 4-2) – (No problem)

Refer to page 19-95

Code 5-0

Diagnosis: Right/Left Rear wheel lock
The ABS indicator light is turned on when either or both rear wheels lock and the wheel sensor signal is missing during driving. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Regular

Probable Cause:
1. Open circuit, internal short or short to body ground in the wheel sensor system
2. Rear brake drag
3. Modulator does not decrease pressure properly
4. Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Wheel spin by operating the parking brake while the parking switch is stuck OFF
3. Car spun out – (No problem)

Refer to page 19-98

Code 5-4

Diagnosis: Right-rear wheel lock
The ABS indicator light is turned on when either or both rear wheels lock and the wheel sensor signal is missing during driving. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Regular

Probable Cause:
1. Open circuit, internal short or short to body ground in the wheel sensor system
2. Rear brake drag
3. Modulator does not decrease pressure properly
4. Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Wheel spin by operating the parking brake while the parking switch is stuck OFF
3. Car spun out – (No problem)

Refer to page 19-98

Code 5-8

Diagnosis: Left-rear wheel lock
The ABS indicator light is turned on when either or both rear wheels lock and the wheel sensor signal is missing during driving. This diagnosis is not performed when the parking brake switch is ON.

Diagnostic Period: Regular

Probable Cause:
1. Open circuit, internal short or short to body ground in the wheel sensor system
2. Rear brake drag
3. Modulator does not decrease pressure properly
4. Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Wheel spin by operating the parking brake while the parking switch is stuck OFF
3. Car spun out – (No problem)

Refer to page 19-98

Code 6-0

Diagnosis: Front/Rear Fail-safe relay
The ABS indicator light is turned on when battery voltage is detected at the solenoid terminal before the fail-safe relays are turned on at the initial diagnosis

Diagnostic Period: Initial

Probable Cause:
1. Short to power in the relay drive circuit between the fail-safe relay and ABS control unit
2. Faulty relay drive transistor (ON) in the ABS control unit
3. Fail-safe relay stuck ON
4. Short to power in the solenoid drive circuits between the fail-safe relay and ABS control unit

Refer to page 19-100

Code 6-1

Diagnosis: Front Fail-safe relay
The ABS indicator light is turned on when battery voltage is detected at the solenoid terminal before the fail-safe relays are turned on at the initial diagnosis

Diagnostic Period: Initial

Probable Cause:
1. Short to power in the relay drive circuit between the fail-safe relay and ABS control unit
2. Faulty relay drive transistor (ON) in the ABS control unit
3. Fail-sage relay stuck ON
4. Short to power in the solenoid drive circuits between the fail-safe relay and ABS control unit

Refer to page 19-102

Code 6-4

Diagnosis: Rear Fail-safe relay
The ABS indicator light is turned on when battery voltage is detected at the solenoid terminal before the fail-safe relays are turned on at the initial diagnosis

Diagnostic Period: Initial

Probable Cause:
1. Short to power in the relay drive circuit between the fail-safe relay and ABS control unit
2. Faulty relay drive transistor (ON) in the ABS control unit
3. Fail-safe relay stuck ON
4. Short to power in the solenoid drive circuits between the fail-safe relay and ABS control unit

Refer to page 19-105

Code 7-1

Diagnosis: Right-front Solenoid
Each solenoid valve is momentarily activated at the initial diagnosis and when the car starts off. The ABS indicator light is turned on when battery voltage is detected at the solenoid terminal.
OR
The ABS indicator light is turned on when zero volts is detected at the solenoid terminal while the solenoid OFF signal is detected at the regular diagnosis.

Diagnostic Period: Initial & Regular

Probable Cause:
1. Fail-safe relay stuck OFF
2. Open circuit in the solenoid drive circuit between the Under-hood ABS Fuse/Relay box and ABS control unit
3. Short to body ground in the solenoid drive circuit between the solenoid and ABS control unit
4. Faulty solenoid drive transistor (ON) in the ABS control unit
5. Short to power in the solenoid drive circuit between the solenoid and ABS control unit
6. Faulty solenoid drive transistor (OFF) in the ABS control unit
7. Short to power in the drive circuit inside the solenoid
8. Short to the outlet circuit in the inlet circuit between the solenoid and ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the solenoid valve drive circuit
2. Intermittent interruption in the solenoid valve ground circuit
3. Intermittent interruption in the fail-safe relay circuit

Refer to page 19-107

Code 7-2

Diagnosis: Left-front Solenoid
Each solenoid valve is momentarily activated at the initial diagnosis and when the car starts off. The ABS indicator light is turned on when battery voltage is detected at the solenoid terminal.
OR
The ABS indicator light is turned on when zero volts is detected at the solenoid terminal while the solenoid OFF signal is detected at the regular diagnosis.

Diagnostic Period: Initial & Regular

Probable Cause:
1. Fail-safe relay stuck OFF
2. Open circuit in the solenoid drive circuit between the Under-hood ABS Fuse/Relay box and ABS control unit
3. Short to body ground in the solenoid drive circuit between the solenoid and ABS control unit
4. Faulty solenoid drive transistor (ON) in the ABS control unit
5. Short to power in the solenoid drive circuit between the solenoid and ABS control unit
6. Faulty solenoid drive transistor (OFF) in the ABS control unit
7. Short to power in the drive circuit inside the solenoid
8. Short to the outlet circuit in the inlet circuit between the solenoid and ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the solenoid valve drive circuit
2. Intermittent interruption in the solenoid valve ground circuit
3. Intermittent interruption in the fail-safe relay circuit

Refer to page 19-111

Code 7-4

Diagnosis: Rear Solenoid
Each solenoid valve is momentarily activated at the initial diagnosis and when the car starts off. The ABS indicator light is turned on when battery voltage is detected at the solenoid terminal.
OR
The ABS indicator light is turned on when zero volts is detected at the solenoid terminal while the solenoid OFF signal is detected at the regular diagnosis.

Diagnostic Period: Initial & Regular

Probable Cause:
1. Fail-safe relay stuck OFF
2. Open circuit in the solenoid drive circuit between the Under-hood ABS Fuse/Relay box and ABS control unit
3. Short to body ground in the solenoid drive circuit between the solenoid and ABS control unit
4. Faulty solenoid drive transistor (ON) in the ABS control unit
5. Short to power in the solenoid drive circuit between the solenoid and ABS control unit
6. Faulty solenoid drive transistor (OFF) in the ABS control unit
7. Short to power in the drive circuit inside the solenoid
8. Short to the outlet circuit in the inlet circuit between the solenoid and ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the solenoid valve drive circuit
2. Intermittent interruption in the solenoid valve ground circuit
3. Intermittent interruption in the fail-safe relay circuit

Refer to page 19-118

Code 8-1

Diagnosis: ABS function
The ABS indicator light is turned on when the ABS functions continuously

Diagnostic Period: Regular

Probable Cause:
1. Wheel sensor signal disappears at speeds of 6 mph (10 km/h) or less
2. Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear:
1. Intermittent interruption in the wheel sensor
2. Rough road driving – (No problem)

Refer to page 19-125

Code 8-2

Diagnosis: ECU comparison
The ABS indicator light is turned on when there is a difference between the ECU data

Diagnostic Period: Initial & Regular

Probable Cause: Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear: (No problem)

Refer to page 19-126

Code 8-4

Diagnosis: ABS Integrated Circuit
The ABS indicator light is turned on when there is an abnormality in the integrated circuit at the regular diagnosis

Diagnostic Period: Initial & Regular

Probable Cause: Faulty ABS control unit

Probable Cause When Symptom Does Not Reappear: (No problem)

Refer to page 19-126




Source: Helms 1997 ACCORD Service Manual P/N 61SV405

Keywords: Honda ABS Codes ALB Anti-Locking Braking System Anti Lock Brake CEL Code OBD-2 OBD-II OBD-I OBD-1 Light Matteu

[JADiss]

A good idea I got from my buddy was to jump the OBD connector with a switch. I've got a radioshack switch on my dash to check CELs while I'm driving. I get a CEL, flip the switch, and know right away what it is.

[aero]

Would help.. but I cant say that I throw CEL's enough to justify a switch.. but if it works for someone, kew. Now on my moms 97 civic... I think i might do that. Stupid thing runs fine, but throws codes ALL the time. They are usually "misfire cyl. 1-4"

[HondaX]

Good Thread...lots of help, ym friends light kept coming on...

[90accordman]

ok i checked the location on your walkthrough and found a brown plug with 2 wires plugged into it when i have the key on the car makes a dinging sound when the connector is out of place. only thing is that i get no codes. But my check engine light does come on from time to time when im driving in stop and go traffic

[xScott]

suiteness!

[excalibur02]

i keep a paper clip in my car and one in my wallet. never know when u need to jump anything..... cel or the external clip.. i know the codes but this is good for others sweettt..

[cp[mike]]

another idea that works well is cutting off that blue plug and hooking up a flat black on/off switch in place of it. i mounted it in the kickpanel cover, so to get the CEL i just flip the switch... works nicely.

[John Conner18]

my car keeps on beeping, and the seat belt light keeps flashing, how do i get rid of the noise?

[ACCORDing2R]

I had the 'switch idea' a while back too, but the light doesn't come on often enough to really bother and install one. I use the paper clip.
My car has the plug as well. I was wondering if it's the same on all Hondas or just on CB7s?? I think some Hondas have an ECU LED light that flashes a code when check engine light comes on. I could be wrong though... maybe it's wasn't a Honda I've seen that on.

[starchland]

yeah this is really handy, saves for paying someone to 'diagnose' a CEL, good work.

[i_love_cb7]

when do u know when the codes are finshed?

Mine just blinks forever..........and like 5 sec bettween each blink so code 1?

[k-mart]

when do u know when the codes are finshed?

Mine just blinks forever..........and like 5 sec bettween each blink so code 1?

i repeats the code(s) over and over and over

so yea, 1 if it is a short blink

[ap716]

so after it blinks does it show a long blink to show that it is going to redo the code again?

[FishyMan]

so any size paper clip is all i need? and i just put it inside the blue connector?

thanks