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 ABS (ABS/TCS) ON-BOARD DIAGNOSIS

ABS (ABS/TCS) ON-BOARD DIAGNOSIS

id040200807300

On-Board Diagnostic (OBD) Test Description

• The OBD test inspects the integrity and function of the ABS (ABS/TCS) and outputs the results when requested by the specific tests.
• On-board diagnostic test also:
- Provides a quick inspection of the ABS (ABS/TCS) 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 3 tests:
- Read/clear diagnostic results, PID monitor and record and active command modes.

Read/clear diagnostic results

• This function allows you to read or clear DTCs in the ABS (ABS/TCS) HU/CM memory.

PID/Data monitor and record

• This function allows you to access certain data values, input signals, calculated values, and system status information.

Active command modes

• This function allows you to control devices through the WDS or equivalent.

Reading DTCs Procedure

1. Connect WDS or equivalent to the vehicle DLC-2 connector.

2. Retrieve DTC using the WDS or equivalent.

Clearing DTCs Procedures

1. After repairs have been made, perform the DTCs reading procedure.

2. Erase DTC using the WDS or equivalent.

3. Ensure that the customer's concern has been resolved.

PID/Data Monitor and Record Procedure

1. Connect WDS or equivalent to the vehicle DLC-2 connector.

2. Access and monitor PIDs using the WDS or equivalent.

Active Command Modes Procedure

Note
• When driving, the ABS motor and each valve automatically turn ABS_POWER on, and then each command on. ABS_POWER regulates the power supply for the ABS motor and 8 valves.

1. Connect WDS or equivalent to the vehicle DLC-2 16-pin connector.

2. Turn the ignition key to ON (engine off) or start engine.

3. Activate active command modes using the WDS or equivalent.

DTC Table

DTC

Diagnosis system component

Page

WDS or equiva-

lent

B1318
ABS (ABS/TCS) power supply
B1342
ABS (ABS/TCS) HU/CM
B2477
Module configuration
C1095
Motor relay, pump motor
C1096
Motor relay, pump motor
C1119
Engine control system, torque reduction inhibit signal line
C1140
ABS (ABS/TCS) HU/CM (pump)
C1145
Right front ABS wheel-speed sensor
C1148
Right front ABS wheel-speed sensor/sensor rotor
C1155
Left front ABS wheel-speed sensor
C1158
Left front ABS wheel-speed sensor/sensor rotor
C1165
Right rear ABS wheel-speed sensor
C1168
Right rear ABS wheel-speed sensor/sensor rotor
C1175
Left rear ABS wheel-speed sensor
C1178
Left rear ABS wheel-speed sensor/sensor rotor
C1186
Fail-safe relay
C1194
Left front pressure reduction solenoid valve
C1198
Left front pressure retention solenoid valve
C1210
Right front pressure reduction solenoid valve
C1214
Right front pressure retention solenoid valve
C1233
Left front ABS wheel-speed sensor/sensor rotor
C1234
Right front ABS wheel-speed sensor/sensor rotor
C1235
Right rear ABS wheel-speed sensor/sensor rotor
C1236
Left rear ABS wheel-speed sensor/sensor rotor
C1242
Left rear pressure reduction solenoid valve
C1246
Right rear pressure reduction solenoid valve
C1250
Left rear pressure retention solenoid valve
C1254
Right rear pressure retention solenoid valve
C1266
Fail-safe relay
C1414
ABS (ABS/TCS) HU/CM
C1508
TCS control
C1510
Right front solenoid valve, motor or ABS wheel-speed sensor/sensor rotor
C1511
Left front solenoid valve, motor or ABS wheel-speed sensor/sensor rotor
C1512
Right rear solenoid valve, motor or ABS wheel-speed sensor/sensor rotor
C1513
Left rear solenoid valve, motor or ABS wheel-speed sensor/sensor rotor
U0073
CAN system communication error
U0100
Communication error to PCM
U0101
Communication error to TCM
U0155
Communication error to instrument cluster
U2021
Engine coolant temperature

PID/DATA Monitor Table

PID Name

(Definition)

Unit/Condition

Condition/Specification

Action

ABS (ABS/TCS) HU/CM terminal

ABS_LAMP
(ABS warning light driver output state)
On/Off
• ABS warning light is illuminated: On
• ABS warning light is not illuminated: Off
Inspect ABS warning light.
-
ABSLF_I
(Left front ABS pressure retention solenoid valve output state)
On/Off
• During ABS control:
On/Off
(solenoid valve is activated/deactivated)
• No ABS control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSLF_O
(Left front ABS pressure reduction solenoid valve output state)
On/Off
• During ABS control: On/Off
(solenoid valve is activated/deactivated)
• No ABS control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSLR_I
(Left rear ABS pressure retention solenoid valve output state)
On/Off
• During ABS or EBD control: On/Off
(solenoid valve is activated/deactivated)
• No ABS and EBD control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSLR_O
(Left rear ABS pressure reduction solenoid valve output state)
On/Off
• During ABS or EBD control: On/Off
(solenoid valve is activated/deactivated)
• No ABS and EBD control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSRF_I
(Right front ABS pressure retention solenoid valve output state)
On/Off
• During ABS control: On/Off
(solenoid valve is activated/deactivated)
• No ABS control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSRF_O
(Right front ABS pressure reduction solenoid valve output state)
On/Off
• During ABS control: On/Off
(solenoid valve is activated/deactivated)
• No ABS control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSRR_I
(Right rear ABS pressure retention solenoid valve output state)
On/Off
• During ABS or EBD control: On/Off
(solenoid valve is activated/deactivated)
• No ABS and EBD control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSRR_O
(Right rear ABS pressure reduction solenoid valve output state)
On/Off
• During ABS or EBD control: On/Off
(solenoid valve is activated/deactivated)
• No ABS and EBD control: Off
(solenoid valve is deactivated)
Internal fault of ABS (ABS/TCS) HU/CM. Replace ABS (ABS/TCS) HU/CM.
-
ABSPMPRLY
(Motor relay output state)
On/Off
• Motor relay is activated: On
• Motor relay is deactivated: Off
Inspect ABS (ABS/TCS) HU/CM.
-
ABSVLVRLY
(Fail-safe relay output state)
On/Off
• Fail-safe relay is
activated: On
• Fail-safe relay is deactivated: Off
Inspect ABS (ABS/TCS) HU/CM.
-
ABS_VOLT
(System battery voltage value)
V
• Ignition key at ON: B+
• Idle: Approx. 14-16 V
Inspect power supply circuit.
Z
BRAKE_LMP
(BRAKE system warning light output state)
On/Off
• BRAKE system warning light is illuminated: On
• BRAKE system warning light is not illuminated: Off
Inspect BRAKE system warning light.
-
BOO_ABS
(Brake pedal switch input)
On/Off
• Brake pedal is depressed: On
• Brake pedal is released: Off
Inspect brake switch.
-
CCNTABS
(Number of continuous codes)
-
• DTC is detected: 1-255
• DTC is not detected: 0
Perform inspection using appropriate DTC.
-
LF_WSPD
(Left front ABS wheel-speed sensor input)
KPH, MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect ABS wheel-speed sensor/sensor rotor.
I, E
LR_WSPD
(Left rear ABS wheel-speed sensor input)
KPH, MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect ABS wheel-speed sensor/sensor rotor.
C, F
PCM_MSG
(Missing message from the PCM)
Present/
Not Present
• Present: Circuit in the PCM is normal.
• Not Present: Circuit in the PCM is abnormal.
Inspect PCM.
Inspect ABS (ABS/TCS) HU/CM.
-
PMPSTAT
(Pump motor output state)
On/Off
• Pump motor is activated: On
• Pump motor is deactivated: Off
Inspect ABS (ABS/TCS) HU/CM.
-
RF_WSPD
(Right front ABS wheel-speed sensor input)
KPH, MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect ABS wheel-speed sensor/sensor rotor.
G, D
RPM
(Engine speed signal input)
RPM
• Engine is stopped: 0 RPM
• Engine is running: Indicates engine speed
Inspect PCM.
-
RR_WSPD
(Right rear ABS wheel-speed sensor input)
KPH, MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect ABS wheel-speed sensor/sensor rotor.
A, B
TCM_MSG*
(Missing message from the TCM)
Present/
Not Present
• Present: Circuit in the TCM is normal.
• Not Present: Circuit in the TCM is abnormal.
Inspect TCM.
Inspect ABS (ABS/TCS) HU/CM.
-

* :
Only vehicles with ATX

Active Command Modes Table

Command Name

Definition

Operation

Note

ABS_POWER
Fail-safe relay
On/Off
Ignition key at ON
(Engine running, vehicle is not moving)
LR_OUTLET
Left rear ABS pressure reduction solenoid valve
On/Off
LR_INLET
Left rear ABS pressure retention solenoid valve
On/Off
RR_INLET
Right rear ABS pressure retention solenoid valve
On/Off
RR_OUTLET
Right rear ABS pressure reduction solenoid valve
On/Off
LF_INLET
Left front ABS pressure retention solenoid valve
On/Off
LF_OUTLET
Left front ABS pressure reduction solenoid valve
On/Off
RF_INLET
Right front ABS pressure retention solenoid valve
On/Off
RF_OUTLET
Right front ABS pressure reduction solenoid valve
On/Off
PMP_MOTOR
ABS motor
On/Off