STEP 1. Measure the sensor supply voltage at valve lift ECU harness side connector.
(1) Disconnect the valve lift ECU connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal BAT1 line and ground.- Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 2. Repair or replace the connector(s), or check and repair the harness of short to ground and open circuit in BAT1 line between MFI relay connector and valve lift ECU connector. Then go to Step 10.
STEP 2. Check of harness damage in BAT1 line between MFI relay connector and valve lift ECU connector.
STEP 3. Check the continuity at valve lift ECU harness side connector.
STEP 4. Inspection of terminal resistors in the ECM VCL-CAN.
STEP 5. Inspection of terminal resistors in the valve lift ECU VCL-CAN.
STEP 6. Check of short to power supply, short to ground, open circuit and harness damage in LCAH line between ECM connector and valve lift ECU connector.
STEP 7. Check of short to power supply, short to ground, open circuit and harness damage in LCAL line between ECM connector and valve lift ECU connector.
STEP 8. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
caution | To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III). |
(1) Connect scan tool (M.U.T-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) . (2) Turn the ignition switch to the "ON" position.
(3) After the MFI-DTC has been deleted, read the MFI-DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC U011B stored?
Replace the valve lift ECU. Then go to Step 9. It can be assumed that this malfunction is intermittent of VCL-CAN between ECM and valve lift ECU. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
STEP 9. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC again.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC U011B stored?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 10. It can be assumed that this malfunction is intermittent of VCL-CAN between ECM and valve lift ECU. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
STEP 10. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
caution | To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III). |
(1) Connect scan tool (M.U.T-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) . (2) Turn the ignition switch to the "ON" position.
(3) After the MFI-DTC has been deleted, read the MFI-DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC U011B stored?
Retry the troubleshooting. The inspection is complete.