D4 blinks , S blinks what am I going to do?
The solution is , go outside dressed in a pink tutu and impress the hell out of everybody.
Easy to diagnose the codes. It's very similar from pulling the ECU codes , except that either the D4 or S will blink.
For 90/91 equipped with the "S" , the S will blink.
For 92/93 the D4 will blink.
CODES:
1: Faulty , Disconnected or shorted lock-up solenoid A
2: Faulty , Disconnected or shorted lock-up solenoid B
3: Disconnected throttle angle sensor
4: Speed Sensor
5: Console switch
6: Off Console switch
7: Shift Solenoid A
8: Shift Solenoid B
9: NC Speed Sensor
10: Water Temperature Sensor
11: Ignition Coil
14: FAS Wire , PGMFI
15: NM Speed Sensor
The solution is , go outside dressed in a pink tutu and impress the hell out of everybody.
Easy to diagnose the codes. It's very similar from pulling the ECU codes , except that either the D4 or S will blink.
For 90/91 equipped with the "S" , the S will blink.
For 92/93 the D4 will blink.
CODES:
1: Faulty , Disconnected or shorted lock-up solenoid A
2: Faulty , Disconnected or shorted lock-up solenoid B
3: Disconnected throttle angle sensor
4: Speed Sensor
5: Console switch
6: Off Console switch
7: Shift Solenoid A
8: Shift Solenoid B
9: NC Speed Sensor
10: Water Temperature Sensor
11: Ignition Coil
14: FAS Wire , PGMFI
15: NM Speed Sensor
Originally posted by TECHAUTO
NC/NM speed sensor, code 9/15
Symptoms of a faulty NM speed sensor: Located at the end (passenger side) of the transmission on some models, check for code 15 or transmission jerks hard when shifting. Symptoms of a faulty NC speed sensor is the lock-up clutch does not engage. The NM or NC speed sensor (code 9) should be within 400-600 Ohms at 20-degrees C. If they are not within spec replace them. If they are within spec check for a possible short to ground but first unplug the harnesses at the TCU.
How to replace the NC speed sensor:
1.To locate the NC speed sensor on the back of the transmission follow two wires connected to the sensor. The sensor is located on the transmission between the engine firewall and the transmission towards the tire's mud guard on the 90-93 Accord. The NC speed sensor appears to look like a fuel injector (not the best of description.)
2Reach inside with a 10 mm socket wrench and unbolt 1 bolt that holds the speed sensor in place.
3.Carefully twist the speed sensor as you pull it out.
4.Replace the O-ring.
How to replace the NM speed sensor:
1.To locate the NM speed sensor on the front of the transmission follow two wires connected to the sensor. The sensor is located on the transmission between the engine radiator and the transmission towards the tire's mud guard on the 90-93 Accord. The NC speed sensor appears to look like a fuel injector (not the best of description.)
2.Reach inside with a 10 mm socket wrench and unbolt 1 bolt that holds the speed sensor in place.
3.Carefully twist the speed sensor as you pull it out.
4.Replace the O-ring.
Symptoms of a faulty NM speed sensor: Located at the end (passenger side) of the transmission on some models, check for code 15 or transmission jerks hard when shifting. Symptoms of a faulty NC speed sensor is the lock-up clutch does not engage. The NM or NC speed sensor (code 9) should be within 400-600 Ohms at 20-degrees C. If they are not within spec replace them. If they are within spec check for a possible short to ground but first unplug the harnesses at the TCU.
How to replace the NC speed sensor:
1.To locate the NC speed sensor on the back of the transmission follow two wires connected to the sensor. The sensor is located on the transmission between the engine firewall and the transmission towards the tire's mud guard on the 90-93 Accord. The NC speed sensor appears to look like a fuel injector (not the best of description.)
2Reach inside with a 10 mm socket wrench and unbolt 1 bolt that holds the speed sensor in place.
3.Carefully twist the speed sensor as you pull it out.
4.Replace the O-ring.
How to replace the NM speed sensor:
1.To locate the NM speed sensor on the front of the transmission follow two wires connected to the sensor. The sensor is located on the transmission between the engine radiator and the transmission towards the tire's mud guard on the 90-93 Accord. The NC speed sensor appears to look like a fuel injector (not the best of description.)
2.Reach inside with a 10 mm socket wrench and unbolt 1 bolt that holds the speed sensor in place.
3.Carefully twist the speed sensor as you pull it out.
4.Replace the O-ring.
, Night Wolf 
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