Trouble Diagnosis For Intermittent Incident

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

Description

Intermittent incidents may occur. In many cases, the malfunction resolves itself (the part or circuit function returns to normal without intervention). It is important to realize that the symptoms described in the customer's complaint often do not recur on (1st trip) DTC visits. Realize also that the most frequent cause of Intermittent
Incidents occurrences is poor electrical connections. Because of this, the conditions under which the incident occurred may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may not indicate the specific malfunctioning area.
Common Intermittent Incidents Report Situations







Diagnosis Procedure


1. INSPECTION START

Erase (1st trip) DTCs.
Emission-Related Diagnostic Information.
- GO TO 2.

2. CHECK GROUND TERMINALS

Check ground terminals for corroding or loose connection.
Power Supply And Ground Circuit.
OK or NG
OK- GO TO 3.
NG- Repair or replace.

3. SEARCH FOR ELECTRICAL INCIDENT

Perform How to Perform Efficient Diagnosis for an Electrical Incident, "INCIDENT SIMULATION
TESTS".
OK or NG
OK- GO TO 4.
NG- Repair or replace.

4. CHECK CONNECTOR TERMINALS

How to Check Terminal, "HOW TO PROBE CONNECTORS", "How to Check Enlarged Contact Spring of Terminal".
OK or NG
OK-INSPECTION END
NG- Repair or replace connector.