How to Proceed With Troubleshooting

MULTIPLEX COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
- Use these procedures to troubleshoot the multiplex communication system.
- *: Use the intelligent tester.

1. VEHICLE BROUGHT TO WORKSHOP
NEXT -- Continue to next step.
2. CUSTOMER PROBLEM ANALYSIS CHECK
NEXT -- Continue to next step.
3. INSPECT BATTERY VOLTAGE
Standard voltage:
10 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding.
NEXT -- Continue to next step.
4. CHECK FOR DTC*
(a) Check for DTCs and note any codes that are output.
(b) Delete the DTC.
(c) Check if the DTC will be output once again when the problem symptom is simulated based on the noted code.
NEXT -- Continue to next step.
5. OVERALL ANALYSIS AND TROUBLESHOOTING
(a) Terminals of ECU Multiplex Communication System

NEXT -- Continue to next step.
6. ADJUST, REPAIR OR REPLACE
NEXT -- Continue to next step.
7. CONFIRMATION TEST
NEXT -- END