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⦆ If there is any problem in the CAN bus lines, an ⦆ Before replacing the ECU, ensure that the OPERATION DTC SET CONDITIONS ⦆ IG1 voltage: 10 V or more ⦆ Throttle opening angle signal: More than 100% TROUBLESHOOTING HINTS Current trouble ⦆ Damaged wiring harness and connectors ⦆ Malfunction of accelerator pedal position sensor ⦆ Malfunction of crankshaft position sensor ⦆ Engine ECU malfunction ⦆ AWD-ECU malfunction Past trouble ⦆ Refer to "How to treat past trouble" (GROUP 00 - DIAGNOSIS ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: Vehicle Communication Interface ⦆ MB991827: M.U.T.-III USB Cable ⦆ MB991910: M.U.T.-III Main Harness A STEP 1. Scan tool MB991958 CAN bus diagnostics Q:Is the check result normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to GROUP 54D - CAN bus diagnostic chart P.54D-17.) Then go to Step 2. STEP 2. Scan tool MB991958 DTC of other systems Q:Is the DTC set? YES: Troubleshoot the engine control system. (Refer to GROUP 13Ab - Diagnostic Trouble Code Chart P.13Ab-44.) NO: Go to Step 3. STEP 3. Scan tool MB991958 DTC of other systems ⦆ Meter Q:Is the DTC set? YES: Go to Step 4. NO: Go to Step 7. ELECTRONIC CONTROL AWD 27C-67 DIAGNOSIS |