Diagnostic Trouble Codes Troubleshooting

DTC TROUBLESHOOTING

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	Check EVAP canister purge power supply circuit Turn OFF ignition switch, disconnect connector from EVAP canister vent valve. Measure voltage between engine ground and "BLK/ RED" wire terminal of EVAP canister vent valve connector. Is it voltage 10 - 14 V?	Go To Step 3.	Open wire in "BLK/RED" circuit.
3	Check wire circuit Disconnect connectors from ECM with ignition switch turned OFF. Measure resistance between "G04-5" terminal of ECM connector and vehicle body ground. Is resistance infinity?	Go To Step 4.	"BLU/WHT" wire shorted to ground circuit.
4	Check wire circuit Measure voltage between "G04-5" terminal of ECM connector and vehicle body ground with ignition switch turned ON. Is voltage 0 V?	Go To Step 5.	"BLU/WHT" wire shorted to other circuits.
5	Check wire circuit Connect connector to EVAP canister vent valve with ignition switch turned OFF. Turn ON ignition switch, measure voltage between "G04-5" terminal of ECM connector and vehicle body ground. Is it voltage 10 - 14 V?	Go To Step 6.	Open wire in "BLU/ WHT" circuit.
6	Check EVAP canister vent valve Check EVAP canister vent valve referring to EVAP CANISTER VENT VALVE INSPECTION . Is it good condition?	Go To Step 7.	Faulty EVAP canister vent valve.
7	Check EVAP canister vent control circuit With ignition switch turned OFF, measure resistance between "G04-6" (or "G04-7") terminal and "G04-5" terminal of ECM connector. Is resistance below 40 n at 20 °C, 68 °F?	Faulty ECM, substitute a known-good ECM and recheck.	High resistance wire in "BLK/RED" and/or "BLU/WHT" circuit.