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

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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 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 M-MDS to the DLC-2 connector.

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2. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

• When using the IDS (laptop PC)

1. Select the “Toolbox” tab.

2. Select “Self Test”.

3. Select “Modules”.

4. Select “EPS”.

• When using the PDS (Pocket PC)

1. Select “Module Tests”.

2. Select “EPS”.

3. Select “Self Test”.

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 DSC. (See ON-BOARD DIAGNOSIS [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)

Clearing DTCs Procedure

1. Connect the M-MDS to the DLC-2 connector.

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2. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

• When using the IDS (laptop PC)

1. Select the “Toolbox” tab.

2. Select “Self Test”.

3. Select “Modules”.

4. Select “EPS”.

• When using the PDS (Pocket PC)

1. Select “Module Tests”.

2. Select “EPS”.

3. Select “Self Test”.

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. Verify that no DTCs are displayed.

PID/Data Monitor and Record Procedure

1. Connect the M-MDS to the DLC-2 connector.

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2. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

• When using the IDS (laptop PC)

1. Select the “Toolbox” tab.

2. Select “Data Logger”.

3. Select “Modules”.

4. Select “EPS”.

• When using the PDS (Pocket PC)

1. Select “Module Tests”.

2. Select “EPS”.

3. Select “Data Logger”.

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 monitor function is used for monitoring the calculated value. Therefore, if the monitored value of the output parts is not within the specification, inspection of the monitored value of input parts corresponding to applicable output part control is necessary. In addition, because the system does not display output part malfunction as abnormality in the monitored value, it is necessary to inspect the output part individually.

DTC Table

DTC	Diagnosis system component	Page
B1238	EHPAS control module	(See DTC B1238 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1317	Battery power supply	(See DTC B1317, B1318 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1318	Battery power supply	(See DTC B1317, B1318 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1342	EHPAS control module	(See DTC B1342 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1352	Ignition power supply	(See DTC B1352 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B2477	EHPAS control module configuration	(See DTC B2477 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
C1099	Electric power steering oil pump (motor)	(See DTC C1099 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
C1278	Steering angle sensor	(See DTC C1278 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)])
U0073	CAN bus communication error	(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
U0100	Lost communication with the PCM	(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
U2023	Fault received from other modules	(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

PID/DATA Monitor Table

PID Name

(Definition)

Unit/

Condition

Condition/Specification

Action

EHPAS control module terminal

BOARD_T

(Printed circuit board temperature)

°C, °F

•  Indicates circuit temperature.

Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)

—

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 PCM INSPECTION [LF, L3].) (See PCM INSPECTION [MZ-CD 1.6 (Y6)].) (See PCM INSPECTION [ZJ, ZY, Z6].)

—

MTR_AMP

(Pump Motor Operation Current)

A

•  Indicates pump motor operation current.

Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)

—

RPM_ACT

(Actual pump motor revolution per minutes)

RPM

•  Indicates pump motor revolution per minutes.

Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)

—

RPM_TGT

(Target pump motor revolution per minutes)

RPM

•  Indicates pump motor target revolution per minutes.

Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)

—

STEER_RATE

(Steering wheel rotation rate)

°/s

•  Indicates steering wheel rotation rate.

Inspect steering angle sensor. (See STEERING ANGLE SENSOR INSPECTION.)

3B, 3D

VPWR

(Module supply voltage)

V

•  IG switch ON: B+

Inspect the battery. (SeeBATTERY INSPECTION [LF, L3].) (See BATTERY INSPECTION [MZ-CD 1.6 (Y6)].) (See BATTERY INSPECTION [ZJ, ZY, Z6].)

Inspect power supply circuit (such as IG switch, fuse).

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 [LF, L3].) (See PCM INSPECTION [MZ-CD 1.6 (Y6)].) (See PCM INSPECTION [ZJ, ZY, Z6].)

—

DTC	Diagnosis system component	Page
M-MDS	Diagnosis system component	Page
B1238	EHPAS control module	(See DTC B1238 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1317	Battery power supply	(See DTC B1317, B1318 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1318	Battery power supply	(See DTC B1317, B1318 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1342	EHPAS control module	(See DTC B1342 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B1352	Ignition power supply	(See DTC B1352 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
B2477	EHPAS control module configuration	(See DTC B2477 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
C1099	Electric power steering oil pump (motor)	(See DTC C1099 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)].)
C1278	Steering angle sensor	(See DTC C1278 [ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)])
U0073	CAN bus communication error	(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
U0100	Lost communication with the PCM	(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
U2023	Fault received from other modules	(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

PID Name (Definition)	Unit/ Condition	Condition/Specification	Action	EHPAS control module terminal
BOARD_T (Printed circuit board temperature)	°C, °F	• Indicates circuit temperature.	Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)	—
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 PCM INSPECTION [LF, L3].) (See PCM INSPECTION [MZ-CD 1.6 (Y6)].) (See PCM INSPECTION [ZJ, ZY, Z6].)	—
MTR_AMP (Pump Motor Operation Current)	A	• Indicates pump motor operation current.	Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)	—
RPM_ACT (Actual pump motor revolution per minutes)	RPM	• Indicates pump motor revolution per minutes.	Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)	—
RPM_TGT (Target pump motor revolution per minutes)	RPM	• Indicates pump motor target revolution per minutes.	Replace the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT REMOVAL/INSTALLATION [ZY, LF, L3, MZ-CD 1.6 (Y6)].)	—
STEER_RATE (Steering wheel rotation rate)	°/s	• Indicates steering wheel rotation rate.	Inspect steering angle sensor. (See STEERING ANGLE SENSOR INSPECTION.)	3B, 3D
VPWR (Module supply voltage)	V	• IG switch ON: B+	Inspect the battery. (SeeBATTERY INSPECTION [LF, L3].) (See BATTERY INSPECTION [MZ-CD 1.6 (Y6)].) (See BATTERY INSPECTION [ZJ, ZY, Z6].) Inspect power supply circuit (such as IG switch, fuse).	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 [LF, L3].) (See PCM INSPECTION [MZ-CD 1.6 (Y6)].) (See PCM INSPECTION [ZJ, ZY, Z6].)	—