ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

• Engine stalls.

CAUTION:

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

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK ELECTRONIC THROTTLE CONTROL RELAY. 1) Turn the ignition switch to OFF. 2) Remove the electronic throttle control relay. 3) Connect the battery to terminals No. 31 and No. 32 of electronic throttle control relay. 4) Measure the resistance between electronic throttle control relay terminals. Terminals No. 29 — No. 30:	Is the resistance less than 1 Ω?		Replace the electronic throttle control relay.
2.CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL RELAY. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector & terminal LHD model with push button start (B220) No. 29 (+) — Chassis ground (−): Except for LHD model with push button start (B220) No. 30 (+) — Chassis ground (−):	Is the voltage 10 V or more?		Repair the open or ground short circuit of power supply circuit.
3.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. 1) Disconnect the connectors from the ECM. 2) Turn the ignition switch to ON. 3) Measure the voltage between electronic throttle control relay connector and chassis ground. Connector & terminal LHD model with push button start (B220) No. 32 (+) — Chassis ground (−): Except for LHD model with push button start (B220) No. 31 (+) — Chassis ground (−):	Is the voltage 10 V or more?	Repair the short circuit to power in the harness between ECM and electronic throttle control relay.
4.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. 1) Turn the ignition switch to OFF. 2) Measure the resistance between electronic throttle control relay connector and chassis ground. Connector & terminal LHD model with push button start (B220) No. 30 — Chassis ground: (B220) No. 32 — Chassis ground: Except for LHD model with push button start (B220) No. 29 — Chassis ground: (B220) No. 31 — Chassis ground:	Is the resistance 1 MΩ or more?		Repair the ground short circuit of harness between ECM and electronic throttle control relay.
5.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Measure the resistance between the ECM and electronic throttle control relay connector. Connector & terminal LHD model with push button start (B135) No. 6 — (B220) No. 32: (B136) No. 1 — (B220) No. 30: (B136) No. 2 — (B220) No. 30: Except for LHD model with push button start (B135) No. 6 — (B220) No. 31: (B136) No. 1 — (B220) No. 29: (B136) No. 2 — (B220) No. 29:	Is the resistance less than 1 Ω?	Repair the poor contact of the ECM connector.	Repair the open circuit of harness between ECM and electronic throttle control relay.