ENGINE (DIAGNOSTICS)(H4SO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

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

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK INPUT SIGNAL OF ECM.

1) Turn the ignition switch to OFF.

2) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B135) No. 5 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the poor contact of ECM connector.

2.CHECK HARNESS BETWEEN ECM AND MAIN FUSE BOX CONNECTOR.

1) Disconnect the connectors from the ECM.

2) Measure the resistance of harness between ECM and chassis ground.

Connector & terminal

(B135) No. 5 — Chassis ground:

Is the resistance less than 10 Ω?

Repair the ground short circuit of harness between ECM connector and battery terminal.

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between ECM and battery

• Poor contact in ECM connector

• Poor contact in battery terminal