DTC U0423:00 [ELECTRIC POWER STEERING (EPS) CONTROL MODULE]

id0602a6818300

DTC U0423:00

Signal (engine switch status) error from instrument cluster

DETECTION CONDITION

•  Error detected in signal from instrument cluster via CAN communication

FAIL-SAFE FUNCTION

•  Refer to “Fail-safe Function Table”. (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)

POSSIBLE CAUSE

•  EPS control module detects the signal that a engine speed is below the specified value

•  Abnormal engine switch status is detected

•  PCM malfunction

•  Instrument cluster malfunction

SYSTEM WIRING DIAGRAM

Not applicable

DTC U0423:00	Signal (engine switch status) error from instrument cluster
DETECTION CONDITION	• Error detected in signal from instrument cluster via CAN communication
FAIL-SAFE FUNCTION	• Refer to “Fail-safe Function Table”. (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)
POSSIBLE CAUSE	• EPS control module detects the signal that a engine speed is below the specified value • Abnormal engine switch status is detected • PCM malfunction • Instrument cluster malfunction
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT FOR INSTRUMENT CLUSTER MALFUNCTION

•  Using the M-MDS, perform the DTC inspection for the instrument cluster.
(See DTC INSPECTION [INSTRUMENT CLUSTER].)

•  Are any DTCs detected?

Yes

Go to applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

DTC troubleshooting completed, then go to the next step.

No

Go to the next step.

2

VERIFY EPS STATUS

•  Start the engine.

•  Turn the steering wheel to the right and left.

•  Is the assist force generated?

Yes

Go to Step 3.

No

Using the M-MDS, perform the tachometer inspection.

(See INSTRUMENT CLUSTER INSPECTION.)

If the tachometer is abnormal, inspect for the PCM malfunction and the related wiring harnesses.

(See ON-BOARD DIAGNOSTIC TEST [PCM (WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].)

(See ON-BOARD DIAGNOSTIC TEST [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].)

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].)

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

If the PCM and related wiring harnesses are normal, replace the instrument cluster

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

Inspection/replacement completed, then go to the next step.

3

VERIFY THAT THE SAME DTC IS NOT PRESENT

•  Make sure to reconnect all disconnected connectors.

•  Using the M-MDS, clear the DTC from the EPS control module.
(See CLEARING DTC [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)

•  Using the M-MDS, perform the EPS control module DTC inspection.
(See DTC INSPECTION [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)

•  Is the same Pending DTC present?

Yes

Repeat the inspection from Step 1.

If the malfunction recurs, replace the EPS control module, then go to the next step.

(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)

No

Go to the next step.

4

VERIFY THAT NO OTHER DTCS ARE PRESENT

•  Are any other DTCs output?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT FOR INSTRUMENT CLUSTER MALFUNCTION • Using the M-MDS, perform the DTC inspection for the instrument cluster. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are any DTCs detected?	Yes	Go to applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].) DTC troubleshooting completed, then go to the next step.
1		No	Go to the next step.
2	VERIFY EPS STATUS • Start the engine. • Turn the steering wheel to the right and left. • Is the assist force generated?	Yes	Go to Step 3.
2		No	Using the M-MDS, perform the tachometer inspection. (See INSTRUMENT CLUSTER INSPECTION.) If the tachometer is abnormal, inspect for the PCM malfunction and the related wiring harnesses. (See ON-BOARD DIAGNOSTIC TEST [PCM (WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].) (See ON-BOARD DIAGNOSTIC TEST [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) If the PCM and related wiring harnesses are normal, replace the instrument cluster (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) Inspection/replacement completed, then go to the next step.
3	VERIFY THAT THE SAME DTC IS NOT PRESENT • Make sure to reconnect all disconnected connectors. • Using the M-MDS, clear the DTC from the EPS control module. (See CLEARING DTC [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].) • Using the M-MDS, perform the EPS control module DTC inspection. (See DTC INSPECTION [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the EPS control module, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)
4		No	DTC troubleshooting completed.