ENGINE (DIAGNOSTICS)(H4SO) > Diagnostics for Engine Starting Failure

CAUTION:

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

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK BATTERY. Check the battery voltage.	Is the voltage 12 V or more?		Charge or replace the battery.
2.CHECK OPERATION OF STARTER MOTOR.	Does the starter motor operate?
3.CHECK DTC.	Is DTC displayed?	Check the appropriate DTC using the List of Diagnostic Trouble Code (DTC).	Repair the poor contact of ECM connector.
4.CHECK INPUT SIGNAL FOR STARTER MOTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from starter motor. 3) Turn the ignition switch to START. 4) Measure the power supply voltage between starter motor connector terminal and engine ground. Connector & terminal (B14) No. 1 (+) — Engine ground (−): NOTE: Place the select lever in “P” or “N” range.	Is the voltage 10 V or more?	Check the starter motor.
5.CHECK HARNESS BETWEEN BATTERY AND IGNITION SWITCH CONNECTOR. 1) Disconnect the connector from ignition switch. 2) Measure the power supply voltage between ignition switch connector and chassis ground. Connector & terminal (B72) No. 1 (+) — Chassis ground (−):	Is the voltage 10 V or more?		Repair the open circuit of harness between ignition switch and battery, and check fuse SBF No. 4 and SBF No. 1.
6.CHECK IGNITION SWITCH. 1) Disconnect the connector from ignition switch. 2) Measure the resistance between ignition switch terminals after turning the ignition switch to START position. Terminals No. 1 — No. 3:	Is the resistance less than 5 Ω?		Replace the ignition switch.
7.CHECK INPUT VOLTAGE OF STARTER RELAY. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from starter relay. 3) Connect the connector to ignition switch. 4) Measure the input voltage between starter relay connector and chassis ground after turning the ignition switch to START position. Connector & terminal LHD model (B225) No. 28 (+) — Chassis ground (−): (B225) No. 26 (+) — Chassis ground (−): RHD model (B225) No. 20 (+) — Chassis ground (−): (B225) No. 21 (+) — Chassis ground (−):	Is the voltage 10 V or more?		Repair the open circuit of harness between starter relay and ignition switch.
8.CHECK STARTER RELAY. 1) Connect the battery to starter relay terminals No. 21 and No. 23. 2) Measure the resistance between starter relay terminals. Terminals LHD model No. 27 — No. 28: RHD model No. 19 — No. 20:	Is the resistance less than 1 Ω?		Replace the starter relay.
9.CHECK INPUT VOLTAGE OF ECM. 1) Turn the ignition switch to OFF. 2) Connect the connector to starter relay. 3) Disconnect the connectors from the ECM. 4) Measure the voltage between ECM and chassis ground. Connector & terminal (B136) No. 32 (+) — Chassis ground (−): (B136) No. 20 (+) — Chassis ground (−):	Is the voltage 10 V or more?	Replace the ECM.	Repair the open or ground short circuit of harness between ECM and starter relay.