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

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

• LHD model

• RHD model

STEP	CHECK	YES	NO
1.CHECK INPUT VOLTAGE OF ECM. 1) Turn the ignition switch to ON. 2) Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 7 (+) — Chassis ground (−): (B135) No. 2 (+) — Chassis ground (−):	Is the voltage 10 — 13 V?		Repair the open or ground short circuit of power supply circuit.
2.CHECK INPUT VOLTAGE OF ECM. 1) Start the engine. 2) Measure the voltage between ECM connector and chassis ground. Connector & terminal (B134) No. 7 (+) — Chassis ground (−): (B135) No. 2 (+) — Chassis ground (−):	Is the voltage 13 — 15 V?		Repair the open or ground short circuit of power supply circuit.
3.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE. 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from the ECM and electronic throttle. 3) Measure the resistance of harness between ECM and electronic throttle connector. Connector & terminal (E57) No. 5 — (B134) No. 19: (E57) No. 3 — (B134) No. 29:	Is the resistance less than 1 Ω?		Repair the open circuit of harness between ECM and electronic throttle connector.
4.CHECK ECM GROUND HARNESS. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B137) No. 1 (+) — Chassis ground (−): (B137) No. 2 (+) — Chassis ground (−): (B137) No. 3 (+) — Chassis ground (−): (B137) No. 7 (+) — Chassis ground (−): (B134) No. 5 (+) — Chassis ground (−):	Is the voltage less than 1 V?	Replace the ECM.	Repair the following item. • Further tighten the engine ground terminal. • Poor contact in ECM connector • Poor contact of coupling connector