WM_06.pdf

STEERING

ON-BOARD DIAGNOSTIC. . . . 06-02

SYMPTOM

TROUBLESHOOTING . . . . . 06-03

GENERAL PROCEDURES . . . 06-10

POWER STEERING . . . . . . . . . 06-14

TECHNICAL DATA . . . . . . . . . . 06-50

SERVICE TOOLS . . . . . . . . . . . 06-60

06–02 ON-BOARD DIAGNOSTIC

ELECTRO HYDRAULIC POWER ASSIST STEERING

(EHPAS) SYSTEM WIRING

DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . 06–02–1

ELECTRO HYDRAULIC POWER ASSIST STEERING

(EHPAS) ON-BOARD

DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . 06–02–2

DTC B1238 . . . . . . . . . . . . . . . . . . . . . . . 06–02–4

DTC B1317, B1318. . . . . . . . . . . . . . . . . . 06–02–4

DTC B1342 . . . . . . . . . . . . . . . . . . . . . . . . 06–02–6

DTC B1352 . . . . . . . . . . . . . . . . . . . . . . . . 06–02–6

DTC B2477 . . . . . . . . . . . . . . . . . . . . . . . . 06–02–7

DTC C1099 . . . . . . . . . . . . . . . . . . . . . . . . 06–02–7

DTC C1278 . . . . . . . . . . . . . . . . . . . . . . . . 06–02–8

End of Toc

ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS) SYSTEM WIRING DIAGRAM

DPE060200000W01

With ABS

EHPAS 80 A

E H PAS CONTROL MODULE

IG SW

EHPAS 5 A

BATTERY

INSTRUMENT CLUSTER

CAN

DRIVER

CAN_L

CAN

DRIVER

CAN_H

EHPAS WARNING

LIGHT

PCM

CAN

DRIVER

STEERING ANGLE SENSOR

DLC-2

DPE602ZW1001

06–02–1

SECTION

To c o f S C T

ON-BOARD DIAGNOSTIC

With DSC

EHPAS 80 A

EHPAS CONTROL MODULE

IG SW

EHPAS 5 A

BATTERY

INSTRUMENT CLUSTER

STEERING ANGLE

SENSOR

CAN_L

DSC HU/CM

CAN

DRIVER

CAN

DRIVER

CAN_H

EHPAS WARNING

LIGHT

PCM

CAN

DRIVER

DLC-2

DPE602ZW1002

End Of Sie

ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS) ON-BOARD DIAGNOSIS

DPE060200000W02

On-Board Diagnostic (OBD) Test Description

• The OBD test inspects the integrity and function of the EHPAS and outputs the results when requested by the

specific tests.

• On-board diagnostic test also:

— Provides a quick inspection of the EHPAS usually performed at the start of each diagnostic procedure.

— Provides verification after repairs to ensure that no other faults occurred during service.

• The OBD test is divided into 2 tests:

— Read/clear diagnostic results, PID monitor and record.

Read/clear diagnostic results

• This function allows reading or clearing of DTCs in the EHPAS control module memory.

PID/Data monitor and record

• This function allows access of certain data values, input signals, calculated values, and system status

information.

Reading DTCs Procedure

1. Connect the WDS or equivalent to the vehicle

DLC-2 connector.

2. Retrieve DTCs using the WDS or equivalent.

DLC-2

DPE402AW1005

Clearing DTCs Procedure

1. After repairs have been made, perform the Reading DTCs Procedure .

06–02–2

ON-BOARD DIAGNOSTIC

2. Clear DTCs using the WDS or equivalent.

3. Verify that the customer’s concern has been resolved.

PID/Data Monitor and Record Procedure

1. Connect the WDS or equivalent to the vehicle

DLC-2 connector.

2. Access and monitor PIDs using the WDS or

equivalent.

DLC-2

DPE402AW1005

DTC Table

DTC

WDS or

equivalent

B1238

Diagnosis system component

Page

EHPAS control module

(See 06–02–4 DTC B1238.)

B1317

Battery power supply

(See 06–02–4 DTC B1317, B1318.)

B1318

Battery power supply

(See 06–02–4 DTC B1317, B1318.)

B1342

EHPAS control module

(See 06–02–6 DTC B1342.)

B1352

Ignition power supply

(See 06–02–6 DTC B1352.)

B2477

EHPAS control module configuration

(See 06–02–7 DTC B2477.)

C1099

Electric power steering oil pump (motor)

(See 06–02–7 DTC C1099.)

C1278

Steering angle sensor

(See 06–02–8 DTC C1278.)

U0073

CAN bus communication error

(See 09–02–1 MULTIPLEX COMMUNICATION

SYSTEM.)

U0100

Lost communication with the PCM

(See 09–02–1 MULTIPLEX COMMUNICATION

SYSTEM.)

U2023

Fault received from other modules

(See 09–02–1 MULTIPLEX COMMUNICATION

SYSTEM.)

PID/DATA Monitor Table

PID Name

(Definition)

Unit/

Condition

Condition/Specification

Action

EHPAS control

module terminal

CCNT

(Number of continuous

codes)

—

• DTCs are detected: 1—255

• No DTCs are detected: 0

Perform inspection using

appropriate DTC.

—

ENGRPM

(Engine speed signal)

RPM

• Engine speed 1,000 rpm:

1000 RPM

Inspect the PCM. (See 01–

40B–10 PCM INSPECTION

[MZR-CD (RF Turbo)].) (See

01–40A–7 PCM

INSPECTION [L8, LF].)

—

MTR_AMP

(Pump Motor Operation

Current)

• Indicates pump motor

operation current.

Replace the EHPAS control

module. (See 06-14–25

ELECTRIC POWER

STEERING OIL PUMP

REMOVAL/INSTALLATION

[L8, LF].)

—

RPM_ACT

(Actual pump motor

revolution per minutes)

RPM

• Indicates pump motor

revolution per minutes.

Replace the EHPAS control

module. (See 06-14–25

ELECTRIC POWER

STEERING OIL PUMP

REMOVAL/INSTALLATION

[L8, LF].)

—

06–02–3

ON-BOARD DIAGNOSTIC

PID Name

(Definition)

Unit/

Condition

Condition/Specification

Action

EHPAS control

module terminal

RPM_TGT

(Target pump motor

revolution per minutes)

RPM

• Indicates pump motor target

revolution per minutes.

Replace the EHPAS control

module. (See 06-14–25

ELECTRIC POWER

STEERING OIL PUMP

REMOVAL/INSTALLATION

[L8, LF].)

—

STEER_RATE

(Steering wheel rotation

rate)

° /s

• Indicates steering wheel

rotation rate.

Inspect steering angle

sensor. (See 09–18–19

STEERING ANGLE

SENSOR INSPECTION.)

3B, 3D

TEMP_BOARD

(Printed circuit board

temperature)

° C

• Indicates circuit temperature.

Replace the EHPAS control

module. (See 06-14–25

ELECTRIC POWER

STEERING OIL PUMP

REMOVAL/INSTALLATION

[L8, LF].)

—

VPWR

(Module supply voltage)

V • IG switch ON: B+

Inspect the battery. (See

01–17B–2 BATTERY

INSPECTION [MZR-CD (RF

Turbo)].) (See 01–17A–5

BATTERY INSPECTION

[L8, LF].)

1B, 2F

VSS

(Vehicle speed)

KPH/MPH

• Vehicle is stopped:

0 KPH/0 MPH

• Vehicle speed 20 km/h {12

mph} : 20 KPH/12 MPH

Inspect the PCM.(See 01–

40B–10 PCM INSPECTION

[MZR-CD (RF Turbo)].) (See

01–40A–7 PCM

INSPECTION [L8, LF].)

Inspect the instrument

cluster. (See 09–22–3

INSTRUMENT CLUSTER

INSPECTION.)

—

End Of Sie

DTC B1238

DPE060200000W03

DTC B1238

Electro hydraulic power assist steering (EHPAS) control module

DETECTION

CONDITION

• Excessive load to electric power steering oil pump

POSSIBLE

CAUSE

• Due to the continuously static steering, being turned to the lock end, or other causes, the internal

temperature of the electric power steering oil pump is more than the specified value.

Diagnostic procedure

STEP

INSPECTION

ACTION

TURN IGNITION SWITCH OFF AND ALLOW ELECTRIC POWER STEERING OIL PUMP TO COOL DOWN.

VERIFY THAT THE SAME DTC IS NOT

PRESENT

• Turn the ignition switch to the ON position.

• Clear the DTC from the memory.

(See 06–02–2 Clearing DTCs Procedure.)

• Is the same DTC present?

Yes Replace the electric power steering oil pump, then go to the

next step.

(See 06-14–25 ELECTRIC POWER STEERING OIL PUMP

REMOVAL/INSTALLATION [L8, LF].)

No Go to the next step.

VERIFY THAT NO OTHER DTCS ARE

PRESENT

• Are any other DTCs output?

Yes Go to the applicable DTC inspection.

(See 06–02–3 DTC Table.)

No DTC troubleshooting completed.

End Of Sie

DTC B1317, B1318

DPE060200000W04

DTC B1317, B1318

Battery power supply

DETECTION

CONDITION

• Low voltage or high voltage are detected at the voltage monitor.

POSSIBLE

CAUSE

• Open or short circuit in wiring harness between electro hydraulic power assist steering (EHPAS) control

module terminal 1B and battery positive terminal

• Battery and/or generator malfunction

06–02–4

ON-BOARD DIAGNOSTIC

EHPAS 80 A FUSE

EHPAS CONTROL

MODULE

BATTERY

EHPAS CONTROL MODULE HARNESS-SIDE CONNECTOR

Diagnostic procedure

STEP

INSPECTION

ACTION

INSPECT BATTERY VOLTAGE

• Is the battery terminal voltage normal?

Yes Make sure that battery terminal connection is okay.

Go to the next step.

No Charge or replace the battery, then go to Step 6.

INSPECT BATTERY GRAVITY

• Is the battery specific gravity as specified?

Yes Go to the next step.

No Replace the battery, then go to Step 6.

INSPECT CHARGING SYSTEM

• Are the generator and drive belt tension

normal?

Yes Go to the next step.

No Replace the generator and/or drive belt if necessary.

Go to step 6.

INSPECT EHPAS CONTROL MODULE

POWER SUPPLY CIRCUIT FOR OPEN OR

SHORT CIRCUIT

• Start the engine.

• Measure the voltage between following

EHPAS control module terminal (wiring

harness-side) and ground.

— EHPAS control module: 1B—ground

• Is the voltage 9 V or more ?

Yes Go to the next Step.

No Repair or replace the wiring harness for open circuit

between the EHPAS control module and ground, then go to

Step 6.

INSPECT EHPAS CONTROL MODULE

GROUND CIRCUIT FOR POOR GROUND OR

OPEN CIRCUIT

• Turn the ignition switch off.

• Measure the resistance between the

following EHPAS control module terminal

(wiring harness-side) and ground.

— EHPAS control module: 1A—ground

• Is the resistance within 0—1 ohm ?

Yes Go to the next step.

No If there is no continuity:

• Repair or replace the wiring harness for open circuit

between the EHPAS control module and ground, then go

to the next step.

If the resistance is not within 0—1 ohm :

• Repair or replace the wiring harness for poor ground,

then go to the next step.

VERIFY THAT THE SAME DTC IS NOT

PRESENT

• Make sure to reconnect all disconnected

connectors.

• Clear the DTC from the memory.

(See 06–02–2 Clearing DTCs Procedure.)

• Is the same DTC present?

Yes Replace the electric power steering oil pump, then go to the

next step.

(See 06-14–25 ELECTRIC POWER STEERING OIL PUMP

REMOVAL/INSTALLATION [L8, LF].)

No Go to the next step.

VERIFY THAT NO OTHER DTCS ARE

PRESENT

• Are any other DTCs output?

Yes Go to the applicable DTC inspection.

(See 06–02–3 DTC Table.)

No DTC troubleshooting completed.

End Of Sie

06–02–5

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