DTC Troubleshooting

WARNING: In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area and away from any open flames such as gas water heater.

DIAGNOSIS PROCEDURE

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 purge valve. Measure voltage between engine ground and "BLK/RED" wire terminal of EVAP canister purge valve connector with ignition switch turned ON. 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 turn OFF. Measure resistance between "C46-30" terminal of ECM connector and vehicle body ground. Is resistance infinity?	Go to Step 4.	"BLU/BLK" wire shorted to ground circuit.
4	Check wire circuit Measure voltage between "C46-30" terminal of ECM connector and vehicle body ground with ignition switch turned ON. Is voltage 0 V?	Go to Step 5.	"BLU/BLK" wire shorted to other circuits.
5	Check wire circuit Connect connector to EVAP canister purge valve with ignition switch turned OFF. Turn ON ignition switch, measure voltage between "C46-30" terminal of ECM connector and vehicle body ground. Is it voltage 10 - 14 V?	Go to Step 6.	Open wire in "BLU/BLK" circuit.
6	Check EVAP canister purge valve Check EVAP canister purge valve referring to EVAP CANISTER PURGE VALVE INSPECTION . Is it good condition?	Go to Step 7.	Faulty EVAP canister purge control valve.
7	Check EVAP canister purge control circuit With ignition switch turn OFF, measure resistance between "G04-6 (or G04-7)" terminal and "C46-30" terminal of ECM connector. Is resistance below 40 ohm at 20°C, 68°F?	Faulty ECM, substitute a known-good ECM and recheck.	High resistance wire in "BLK/RED" and/or "BLU/BLK" circuit.