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

DTC 51 POWER SUPPLY VOLTAGE FAILURE

TROUBLE SYMPTOM:

The steering wheel operation feels heavy.

WIRING DIAGRAM:

• Gasoline engine model

• Diesel engine model

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 (−):

(B450) No. 1 (+) — Chassis ground (−):

Is the voltage 12 V or more?

Repair the harness and connector.

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 ground circuit.