Maxima SE V6-3.0L (VQ30DE) (1998)
ON BOARD DIAGNOSIS LOGIC
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If DTC cannot be confirmed, perform "Procedure for malfunction B".
Procedure for malfunction A
NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF"
and wait at least 5 seconds before conducting the next test.
Without Scan Tools
1) Turn ignition switch "ON".
2) Verify that voltage between ECM terminal (59) (engine coolant temperature) is more 1.5V.
If the voltage is below the range, cool the engine down.
3) Start engine and let it idle for at least 8 seconds.
4) Turn ignition switch "OFF" and wait at least 5 seconds.
5) Turn ignition switch "ON" and perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
Procedure for malfunction B
CAUTION: Always drive vehicle at a safe speed.
NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF"
and wait at least 5 seconds before conducting the next test.
TESTING CONDITION:
Always perform the test at a temperature of -10°C (14°F) or higher.
OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the EGR temperature sensor. During this check, a 1st trip DTC might not be confirmed.
Without TOOLS
1) Start engine and warm it up to normal operating temperature.
2) Run engine at idle for at least 2 minutes.
3) Confirm that EGR valve is not lifting. If NG, go to TROUBLE DIAGNOSES FOR DTC P0400 and P0402.
4) Check voltage between ECM terminal (63) and ground at about 1,500 rpm with EGR valve lifted up to the full position by hand.
Voltage should decrease to less than 1.0V.
5) If step 4 is OK, perform TROUBLE DIAGNOSES FOR DTC P0400, P0402 and P1400.