STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line
(1) 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). |
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III)
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(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2. Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
STEP 2. Using scan tool (M.U.T.-III), read the combination meter diagnostic trouble code
STEP 3. Using scan tool (M.U.T.-III), read for A/C-ECU diagnostic trouble code.
STEP 4. Resistance measurement at the combination meter connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the combination meter connector (GND1 terminal) and ground.OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 6 Go to Step 5
STEP 5. Check of short to ground circuit in GND1 line between combination meter connector and ground.
STEP 6. Voltage measurement at the combination meter connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the combination meter connector (IL+P terminal) and ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 9 Go to Step 7
STEP 7. Check of short to power supply circuit in IL+P line between the fusible link and combination meter connector.
STEP 8. Check of short to power supply circuit in ILL+ or PWM line between the combination meter connector and meter information switch connector.
STEP 9. Check by scan tool (M.U.T.-III) "Special Function"
STEP 10. Retest the system.