ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

• Improper idling

• Poor acceleration

• Cruise control does not operate.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK POOR CONTACT. Check for poor contact in ECM connector and neutral position switch connector.	Is there poor contact in ECM connector or neutral position switch connector?	Repair the poor contact of ECM connector or neutral position switch connector.
2.CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from ECM and neutral position switch. 3) Measure the resistance of harness between ECM connector and neutral position switch connector. Connector & terminal (B135) No. 21 — (B25) No. 2:	Is the resistance less than 1 Ω?		Repair the open circuit in harness between ECM connector and neutral position switch connector.
3.CHECK HARNESS BETWEEN NEUTRAL POSITION SWITCH CONNECTOR AND ENGINE GROUND. Measure the resistance between neutral position switch connector and engine ground. Connector & terminal (B25) No. 2 — Engine ground:	Is the resistance 1 MΩ or more?		Repair the short circuit to ground harness between ECM connector and neutral position switch connector.
4.CHECK HARNESS BETWEEN NEUTRAL POSITION SWITCH CONNECTOR AND ENGINE GROUND. Measure the resistance between neutral position switch connector and engine ground. Connector & terminal (B25) No. 1 — Engine ground:	Is the resistance less than 1 Ω?	Replace the neutral position switch.	Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit in harness between neutral position switch connector and engine ground • Poor contact of coupling connector