EPS Warning Light Circuit

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: EPS Warning Light Circuit

EPS Warning Light Circuit

DESCRIPTION

If the power steering ECU detects a malfunction, the P/S warning light comes on. At this time, the power steering ECU stores a DTC in its memory.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the steering column or power steering ECU is replaced, perform rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)
(a) Check for DTCs.
OK:
DTC is not output.
NG -- GO TO CAN COMMUNICATION SYSTEM
OK -- Continue to next step.

2. CHECK FOR DTC (POWER STEERING SYSTEM)
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A -- Continue to next step.

3. CHECK COMBINATION METER ASSEMBLY
(a) Check the combination meter assembly condition.
(1) Turn the ignition switch to ON.
(2) Check that the P/S warning light comes on for 3 seconds after the ignition switch is turned to ON.
OK:
The combination meter assembly operates normally.
NG -- GO TO CAN COMMUNICATION SYSTEM
OK -- REPLACE POWER STEERING ECU