POWER ASSISTED SYSTEM (POWER STEERING) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC 54 POWER SUPPLY RELAY FAILURE

TROUBLE SYMPTOM:

• The steering wheel operation feels heavy.

• Steering warning light illuminates.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK BATTERY.

1) Measure the battery voltage.

2) Measure the battery specific gravity.

Is the voltage 12 V or more? Is the specific gravity 1.260 or more?

Charge or replace the battery.

2.CHECK WIRING HARNESS.

1) Disconnect the connector from the power steering control module.

2) Turn the ignition switch to ON.

3) Using a tester and test harness, check the voltage between terminals.

Connector & terminal

(B452) No. 2 (+) — Chassis ground (−):

Is the voltage 12 V or more?

Repair the open circuit of harness or the poor contact of connector between the power steering control module and the battery.

3.CHECK GROUND CIRCUIT.

1) Turn the ignition switch to OFF.

2) Using a tester and test harness, check the resistance between terminals.

Connector & terminal

(B452) No. 1 — Chassis ground:

Is the resistance less than 1 Ω?

Check for poor contact of terminals in the power steering control module, and if there are no malfunctions, replace the power steering control module.

Repair the open circuit or poor contact of the harness between the power steering control module and chassis ground.