How to Proceed With Troubleshooting

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

HINT
* Use this procedure to troubleshoot the multiplex communication system.
* *: Use the Techstream

1. VEHICLE BROUGHT TO WORKSHOP

NEXT -- Continue to next step.

2. CUSTOMER PROBLEM ANALYSIS

HINT
* In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
* Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
* The following 5 items are important points in problem analysis:





NEXT -- Continue to next step.

3. INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

NEXT -- Continue to next step.

4. CHECK FOR DTC*

(a) Clear the DTC Multiplex Communication System.

(b) Recheck for DTCs.

Result:





B -- GO TO DIAGNOSTIC TROUBLE CODE CHART Multiplex Communication System
A -- Continue to next step.

5. OVERALL ANALYSIS AND TROUBLESHOOTING

(a) Terminals of ECU Multiplex Communication System

NEXT -- Continue to next step.

6. REPAIR OR REPLACE

NEXT -- Continue to next step.

7. CONFIRMATION TEST

NEXT -- END