ENGINE (DIAGNOSTICS)(H4DOTC) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1520 STARTER SW 2 SYSTEM CIRCUIT (ON)

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

DTC P1520 STARTER SW 2 SYSTEM CIRCUIT (ON)

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Failure of engine to start

CAUTION:

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

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK STARTER MOTOR. 1) Turn the ignition to ON. 2) Check the starter motor condition.	Is the starter motor rotating?		Repair the short circuit to power supply. NOTE: In this case, repair the following harnesses: • Short circuit to power supply in harness between ECM and starter relay connector • Short circuit to power supply in harness between ECM and starter motor • Short circuit to power supply in harness between starter relay connector and starter motor
2.CHECK HARNESS BETWEEN STARTER CUT RELAY CONNECTOR AND STARTER RELAY CONNECTOR. 1) Turn the ignition to OFF. 2) Disconnect the connector from starter motor. 3) Remove the starter cut relay and starter relay. 4) Turn the ignition to ON. 5) Measure the voltage between starter relay connector and chassis ground. Connector & terminal (B225) No. 9 (+) — Chassis ground (−):	Is the voltage 10 V or more?	Repair the short circuit to power supply in harness between starter cut relay connector and starter relay connector.
3.CHECK STARTER CUT RELAY. 1) Connect the battery to starter cut relay terminals No. 1 and No. 3. 2) Measure the resistance between starter cut relay terminals. Terminals No. 2 — No. 5:	Is the resistance 1 MΩ or more?		Replace the starter cut relay.
4.CHECK HARNESS BETWEEN ECM AND STARTER RELAY CONNECTOR. 1) Disconnect the connectors from the ECM. 2) Measure the resistance between ECM and chassis ground. Connector & terminal (B136) No. 20 — Chassis ground:	Is the resistance 1 MΩ or more?		Repair the short circuit to ground in harness between ECM and starter relay connector.
5.CHECK STARTER RELAY. Measure the resistance between starter relay terminals. Terminals No. 9 — No. 10:	Is the resistance 1 MΩ or more?		Replace the starter relay.
6.CHECK HARNESS BETWEEN ECM, STARTER RELAY CONNECTOR AND STARTER MOTOR. 1) Disconnect the connectors from the ECM. 2) Turn the ignition to ON. 3) Measure the voltage between ECM and chassis ground. Connector & terminal (B135) No. 13 (+) — Chassis ground (−):	Is the voltage 10 V or more?	Repair the short circuit to power supply. NOTE: In this case, repair the following harnesses: • Short circuit to power supply in harness between ECM and starter relay connector • Short circuit to power supply in harness between ECM and starter motor • Short circuit to power supply in harness between starter relay connector and starter motor	Repair the poor contact of the ECM connector.