STEP 1. Check power supply fuse.
STEP 2. Measure the power supply voltage at ECM connector.
(1) Disconnect the ECM connector, and measure at harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal DIB1 and ground.- Voltage should be battery positive voltage.
(4) Measure the voltage between terminal DIB2 and ground.- Voltage should be battery positive voltage.
(5) Measure the voltage between terminal DIB3 and ground.- Voltage should be battery positive voltage.
(6) Measure the voltage between terminal DIB4 and ground.- Voltage should be battery positive voltage.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 3. Repair or replace the connector(s), or check and repair the harness of open circuit in DIB1, DIB2, DIB3 or DIB4 line between MFI relay connector and ECM connector. Then go to Step 9.
STEP 3. Check of harness damage in DIB1 line between MFI relay connector and ECM connector.
STEP 4. Check of harness damage in DIB2 line between MFI relay connector and ECM connector.
STEP 5. Check of harness damage in DIB3 line between MFI relay connector and ECM connector.
STEP 6. Check of harness damage in DIB4 line between MFI relay connector and ECM connector.
STEP 7. Check the continuity at ECM harness side connector.
STEP 8. Check the trouble symptoms.
STEP 9. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 . (2) Check the diagnostic trouble code (DTC).
Is DTC P062B set?
Retry the troubleshooting. The inspection is complete.