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

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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/Data monitor and record.

Read/clear diagnostic results

• This function allows reading or clearing of DTCs in the EHPAS CM 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 M-MDS (IDS) to the DLC-2.

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2. After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1) Select “Self Test”.

(2) Select “Modules”.

(3) Select “EPS”.

3. Verify the DTC according to the directions on the screen.

• If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection.

4. After completion of repairs, clear all DTCs stored in the EHPAS CM. (See Clearing DTCs Procedures.)

Clearing DTCs Procedures

1. Connect the M-MDS (IDS) to the DLC-2.

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2. After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1) Select “Self Test”.

(2) Select “Modules”.

(3) Select “EPS”.

3. Verify the DTC according to the directions on the screen.

4. Press the clear button on the DTC screen to clear the DTC.

5. Switch the ignition to off.

6. Switch the ignition to ON and wait for 5 s or more.

7. Perform DTC inspection. (See Reading DTCs Procedure.)

8. Verify that no DTCs are displayed.

PID/Data Monitor and Record Procedure

1. Connect the M-MDS (IDS) to the DLC-2.

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2. After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1) Select “DataLogger”.

(2) Select “Modules”.

(3) Select “EPS”.

3. Select the applicable PID from the PID table.

4. Verify the PID data according to the directions on the screen.

Note

• The PID data screen function is used for monitoring the calculated value of input/output signals in the module.Therefore, if the monitored value of the output parts is not within the specification, it is necessary to inspect the monitored value of input parts corresponding to the applicable output part control. In addition, because the system does not display an output part malfunction as an abnormality in the monitored value, it is necessary to inspect the output parts individually.

• When detecting DTCs, PIDs related to a malfunctioning system may not display even if the module is normal. Therefore, if a PID is not displayed, it is necessary to verify the DTC, perform malfunction diagnosis of the DTC that was detected, and do repairs.

DTC Table

DTC

Diagnosis system component

Page

M-MDS

B1238

EHPAS CM

(See DTC B1238.)

B1317

Battery power supply

(See DTC B1317/B1318.)

B1318

Battery power supply

B1342

EHPAS CM

(See DTC B1342.)

B1352

Ignition power supply

(See DTC B1352.)

B2477

EHPAS CM configuration

(See DTC B2477.)

C1099

Electric power steering oil pump (motor)

(See DTC C1099.)

C1938

Signal error from BCM

(See DTC C1938.)

U0073

CAN system communication error

(See DTC U0073.)

U0100

Communication error to PCM

(See DTC U0100/U0140/U0155.)

U0140

Communication error to BCM

U0155

Communication error to instrument cluster

U0401

Signal error from PCM

(See DTC U0401 [MZR 2.0 DISI i-stop].)

U2023

Signal error from PCM

(See DTC U2023.)

DTC	Diagnosis system component	Page
B1238	EHPAS CM	(See DTC B1238.)
B1317	Battery power supply	(See DTC B1317/B1318.)
B1318	Battery power supply
B1342	EHPAS CM	(See DTC B1342.)
B1352	Ignition power supply	(See DTC B1352.)
B2477	EHPAS CM configuration	(See DTC B2477.)
C1099	Electric power steering oil pump (motor)	(See DTC C1099.)
C1938	Signal error from BCM	(See DTC C1938.)
U0073	CAN system communication error	(See DTC U0073.)
U0100	Communication error to PCM	(See DTC U0100/U0140/U0155.)
U0140	Communication error to BCM
U0155	Communication error to instrument cluster
U0401	Signal error from PCM	(See DTC U0401 [MZR 2.0 DISI i-stop].)
U2023	Signal error from PCM	(See DTC U2023.)

PID/DATA Monitor Table

PID Name

(Definition)

Unit/

Condition

Condition/Specification

Action

EHPAS CM terminal

DTC_CNT

(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 PCM INSPECTION [ZY, Z6].)

(See PCM INSPECTION [LF, L5].)

(See PCM INSPECTION [MZR 2.0 DISI i-stop].)

(See PCM INSPECTION [L3 Turbo].)

(See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].)

(See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO5 emission level)].)

(See PCM INSPECTION [MZR-CD 2.2].)

—

MTR_AMP

(Pump Motor Operation Current)

A

•  Indicates pump motor operation current.

Replace the EHPAS CM.

(See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)

—

RPM_ACT

(Actual pump motor revolution per minutes)

RPM

•  Indicates pump motor revolution per minutes.

Replace the EHPAS CM.

(See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)

—

RPM_TGT

(Target pump motor revolution per minutes)

RPM

•  Indicates pump motor target revolution per minutes.

Replace the EHPAS CM.

(See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)

—

STEER_RATE

(Steering wheel rotation rate)

°/s

•  Indicates steering wheel rotation rate.

Inspect steering angle sensor.

(See STEERING ANGLE SENSOR INSPECTION.)

—

BOARD_T

(Printed circuit board temperature)

°F, °C

•  Indicates circuit temperature.

Replace the EHPAS CM.

(See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)

—

VPWR

(Module supply voltage)

V

•  Switch the ignition to ON: B+

Inspect the battery.

(See BATTERY INSPECTION [ZY, Z6].)

(See BATTERY INSPECTION [LF, L5].)

(See BATTERY INSPECTION [MZR 2.0 DISI i-stop].)

(See BATTERY INSPECTION [L3 Turbo].)

(See BATTERY INSPECTION [MZ-CD 1.6 (Y6)].)

(See BATTERY INSPECTION [MZR-CD 2.2].)

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 PCM INSPECTION [ZY, Z6].)

(See PCM INSPECTION [LF, L5].)

(See PCM INSPECTION [MZR 2.0 DISI i-stop].)

(See PCM INSPECTION [L3 Turbo].)

(See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].)

(See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO5 emission level)].)

(See PCM INSPECTION [MZR-CD 2.2].)

Inspect the instrument cluster.

(See INSTRUMENT CLUSTER INSPECTION.)

—

DTC	Diagnosis system component	Page
M-MDS	Diagnosis system component	Page
B1238	EHPAS CM	(See DTC B1238.)
B1317	Battery power supply	(See DTC B1317/B1318.)
B1318	Battery power supply	(See DTC B1317/B1318.)
B1342	EHPAS CM	(See DTC B1342.)
B1352	Ignition power supply	(See DTC B1352.)
B2477	EHPAS CM configuration	(See DTC B2477.)
C1099	Electric power steering oil pump (motor)	(See DTC C1099.)
C1938	Signal error from BCM	(See DTC C1938.)
U0073	CAN system communication error	(See DTC U0073.)
U0100	Communication error to PCM	(See DTC U0100/U0140/U0155.)
U0140	Communication error to BCM
U0155	Communication error to instrument cluster
U0401	Signal error from PCM	(See DTC U0401 [MZR 2.0 DISI i-stop].)
U2023	Signal error from PCM	(See DTC U2023.)

PID Name (Definition)	Unit/ Condition	Condition/Specification	Action	EHPAS CM terminal
DTC_CNT (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 PCM INSPECTION [ZY, Z6].) (See PCM INSPECTION [LF, L5].) (See PCM INSPECTION [MZR 2.0 DISI i-stop].) (See PCM INSPECTION [L3 Turbo].) (See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].) (See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO5 emission level)].) (See PCM INSPECTION [MZR-CD 2.2].)	—
MTR_AMP (Pump Motor Operation Current)	A	• Indicates pump motor operation current.	Replace the EHPAS CM. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)	—
RPM_ACT (Actual pump motor revolution per minutes)	RPM	• Indicates pump motor revolution per minutes.	Replace the EHPAS CM. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)	—
RPM_TGT (Target pump motor revolution per minutes)	RPM	• Indicates pump motor target revolution per minutes.	Replace the EHPAS CM. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)	—
STEER_RATE (Steering wheel rotation rate)	°/s	• Indicates steering wheel rotation rate.	Inspect steering angle sensor. (See STEERING ANGLE SENSOR INSPECTION.)	—
BOARD_T (Printed circuit board temperature)	°F, °C	• Indicates circuit temperature.	Replace the EHPAS CM. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION.)	—
VPWR (Module supply voltage)	V	• Switch the ignition to ON: B+	Inspect the battery. (See BATTERY INSPECTION [ZY, Z6].) (See BATTERY INSPECTION [LF, L5].) (See BATTERY INSPECTION [MZR 2.0 DISI i-stop].) (See BATTERY INSPECTION [L3 Turbo].) (See BATTERY INSPECTION [MZ-CD 1.6 (Y6)].) (See BATTERY INSPECTION [MZR-CD 2.2].)	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 PCM INSPECTION [ZY, Z6].) (See PCM INSPECTION [LF, L5].) (See PCM INSPECTION [MZR 2.0 DISI i-stop].) (See PCM INSPECTION [L3 Turbo].) (See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].) (See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO5 emission level)].) (See PCM INSPECTION [MZR-CD 2.2].) Inspect the instrument cluster. (See INSTRUMENT CLUSTER INSPECTION.)	—