DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step	Action	Yes	No
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to "ENGINE AND EMISSION CONTROL SYSTEM CHECK ".
2	Remove ECM cover. Measure voltage at terminal "C51 -1 -24" of ECM connector connected, under the following condition. Engine starter signal specifications After starting engine: 0 - 1 V Is voltage as specified?	Intermittent power short or faulty ECM. Check Intermittent power short. If intermittent power short is OK, substitute a known-good ECM and recheck.	"BLK/YEL" circuit shorted to other circuit. If "BLK/YEL" circuit is OK, substitute a known-good ECM and recheck.

Step

Action

Yes

Was "Engine and Emission Control System Check" performed?

Go to Step 2.

Remove ECM cover.
Measure voltage at terminal "C51 -1 -24" of ECM connector connected, under the following condition.

Engine starter signal specifications After starting engine: 0 - 1 V

Is voltage as specified?

Intermittent power short or faulty ECM.

Check Intermittent power short.

If intermittent power short is OK, substitute a known-good ECM and recheck.

"BLK/YEL" circuit shorted to other circuit.

If "BLK/YEL" circuit is OK, substitute a known-good ECM and recheck.