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

id060200800800

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.

Clearing DTCs Procedure

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

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.

DTC Table

DTC

Diagnosis system component

Page

WDS or equivalent

B1238
EHPAS control module
(See DTC B1238.)
B1317
Battery power supply
B1318
Battery power supply
B1342
EHPAS control module
(See DTC B1342.)
B1352
Ignition power supply
(See DTC B1352.)
B2141
EHPAS control module configuration
B2477
EHPAS control module configuration
C1099
Electric power steering oil pump (motor)
(See DTC C1099.)
C1278
P/S angle sensor, steering angle sensor
C1956
P/S angle sensor
U0073
CAN bus communication error
U0100
Lost communication with the PCM
U2023
Fault received from other modules

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.
-
MTR_AMP
(Pump Motor Operation Current)
Ampere
• Indicates pump motor operation current.
-
ENGRPM
(Engine speed signal)
RPM
• Engine speed 1,000 rpm: 1000 RPM
Inspect the PCM. (See PCM INSPECTION [ZY, Z6].) (See PCM INSPECTION [LF, L3].)
-
RPM_ACT
(Actual pump motor revolution per minutes)
RPM
• Indicates pump motor revolution per minutes.
-
RPM_TGT
(Target pump motor revolution per minutes)
RPM
• Indicates pump motor target revolution per minutes.
-
STEER_RATE
(Steering wheel rotation rate)
Degree/sec
• Indicates steering wheel rotation rate.
Inspect P/S angle sensor*1 or steering angle sensor*2. (See P/S ANGLE SENSOR INSPECTION.) (See STEERING ANGLE SENSOR INSPECTION.)
3B, 3D
BOARD_T
(Printed circuit board temperature)
Celsius/Fahrenheit
• Indicates circuit temperature.
-
VPWR
(Module supply voltage)
Volt
• IG switch ON: B+
Inspect the battery. (See BATTERY INSPECTION.)
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 [ZY, Z6].) (See PCM INSPECTION [LF, L3].)
-

*1 :
With P/S angle sensor [Applied VIN (assumed): JM0 BK10*100 100001-150353, JM6 BK10*100 100001-150353, JM7 BK**6**# 100001-150353]
*2 :
Without P/S angle sensor [Applied VIN (assumed): JM0 BK10*100 150354-, JM6 BK10*100 150354-, JM7 BK**6**# 150354-]