[54A] CHASSIS ELECTRICAL - - IGNITION SWITCH - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1: Communication with MUT-II/III is Impossible. | PRINT PAGE / INDEX / PRIOR / NEXT

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with MUT-II/III is Impossible.
TECHNICAL DESCRIPTION (COMMENT) This malfunction may be caused by a defective immobilizer-ECU, engine-A/T-ECU, or a defect in the communication line between the immobilizer-ECU and engine-A/T-ECU. If this malfunction appears when the MPI system and MUT-II/III can communicate each other, MPI system diagnosis code 54 will reset. If the MPI system is normal, the engine control relay can be determined as normal. In addition, if the MPI system and MUT-II/III can communicate each other, the circuits between the diagnosis connector and the engine-A/T-ECU can determined as normal. NOTE: If this malfunction appears, MPI system diagnosis code 54 will be output.
TROUBLESHOOTING HINTS Malfunction of the immobilizer-ECU Malfunction of the engine-A/T-ECU The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
| DIAGNOSIS PROCEDURE
| STEP 1. Check if MUT-II/III can communicate with the MPI system and if an MPI system diagnosis code other than P0513 is set. Q: Can MUT-II/III communicate with the MPI system? Is an MPI system diagnosis code other than P0513 set? YES: Go to Step 2. NO: Refer to GROUP 13C, MPI Diagnosis .
| STEP 2. Measure the voltage at immobilizer-ECU connector C-304-1. Disconnect immobilizer-ECU connector C-304-1. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 1 and earth. OK: Battery positive voltage Q: Is the check result normal? YES: Go to Step 5. NO: Go to Step 3.
| STEP 3. Connector check: Immobilizer-ECU connector C-304-1 and engine control relay connector B-17X. Q: Are immobilizer-ECU connector C-304-1 and engine control relay connector B-17X in good condition? YES: Go to Step 4. NO: Repair or replace the damaged component(s). Confirm that MUT-II/III communicates normally.
| STEP 4. Check the harness wires between immobilizer-ECU connector C-304-1 (terminal 1) and engine control relay connector B-17X (terminal 1). NOTE: Prior to the wiring harness inspection, check intermediate connector C-106, joint connector C-17 and key reminder switch connector C-304, and repair if necessary. Q: Are the harness wires between immobilizer-ECU connector C-304-1 (terminal 1) and engine control relay connector B-17X (terminal 1) in good condition? YES: There is no action to be taken. NO: Replace damaged component(s). Confirm that MUT-II/III communicates normally.
| STEP 5. Measure the resistance at immobilizer-ECU connector C-304-1. Disconnect immobilizer-ECU connector C-304-1. Measure the resistance between terminal 4 and earth. OK: 2 ohms or less Q: Is the check result normal? YES: Go to Step 8. NO: Go to Step 6.
| STEP 6. Connector check: Immobilizer-ECU connector C-304-1. Q: Is immobilizer-ECU connector C-304-1 in good condition? YES: Go to Step 7. NO: Repair or replace the damaged component(s).Confirm that MUT-II/III communicates normally.
| STEP 7. Check the harness wire between immobilizer-ECU connector C-304-1 (terminal 4) and earth. NOTE: Prior to the wiring harness inspection, check key reminder switch connector C-304, and repair if necessary. Q: Is the harness wire between immobilizer-ECU connector C-304-1 (terminal 4) and earth in good condition? YES: There is no action to be taken. NO: Repair or replace the damaged component(s). Confirm that MUT-II/III communicates normally.
| STEP 8. Connector check: Immobilizer-ECU connector C-304-1 and engine-A/T-ECU connector C-109. Q: Are immobilizer-ECU connector C-304-1 and engine-A/T-ECU connector C-109 in good condition? YES: Go to Step 9. NO: Repair or replace the damaged component(s). Confirm that MUT-II/III communicates normally.
| STEP 9. Check the harness wires between immobilizer-ECU connector C-304-1 (terminal 3) and engine-A/T-ECU connector C-109 (terminal 111). NOTE: Prior to the wiring harness inspection, check key reminder switch connector C-304, intermediate connector C-104, and repair if necessary. Q: Are the harness wires between immobilizer-ECU connector C-304-1 (terminal 3) and engine-A/T-ECU connector C-109 (terminal 111) in good condition? YES: Go to Step 10. NO: Repair or replace the damaged component(s). Confirm that MUT-II/III communicates normally.
| STEP 10. Replace the immobilizer-ECU or engine-A/T-ECU. Replace the immobilizer-ECU or engine-A/T-ECU. Q: Did the communication with the MUT-II/III become possible after replacing the immobilizer-ECU or the engine-A/T-ECU? YES: Register the password (secret code) and encrypted code . Confirm that MUT-II/III communicates normally NO: Go to Step 11.
| STEP 11. Recheck for malfunction. Q: Is a malfunction eliminated? YES: The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ). NO: Replace the immobilizer-ECU or engine-A/T-ECU.

[54A] CHASSIS ELECTRICAL - - IGNITION SWITCH - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1: Communication with MUT-II/III is Impossible. | PRINT PAGE / INDEX / PRIOR / NEXT

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