ABS (ABS/TCS) ON-BOARD DIAGNOSIS

id040214807300

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 by WDS or equivalent.

Clearing DTCs Procedures

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

2. Erase DTC by 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 by 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 switch to ON (Engine OFF) or start engine.

3. Activate active command modes using 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
C1140
ABS (ABS/TCS) HU/CM (pump)
C1145
Right front wheel-speed sensor
C1148
Right front wheel-speed sensor/sensor rotor
C1155
Left front wheel-speed sensor
C1158
Left front wheel-speed sensor/sensor rotor
C1165
Right rear wheel-speed sensor
C1168
Right rear wheel-speed sensor/sensor rotor
C1175
Left rear wheel-speed sensor
C1178
Left rear 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 wheel-speed sensor/sensor rotor
C1234
Right front wheel-speed sensor/sensor rotor
C1235
Right rear wheel-speed sensor/sensor rotor
C1236
Left rear 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 ABS pressure retention solenoid valve
C1266
Fail-safe relay
C1414
ABS (ABS/TCS) HU/CM
C1508
ABS/TCS HU/CM
C1510
Right front solenoid valve, motor or wheel-speed sensor/sensor rotor
C1511
Left front solenoid valve, motor or wheel-speed sensor/sensor rotor
C1512
Right rear solenoid valve, motor or wheel-speed sensor/sensor rotor
C1513
Left rear solenoid valve, motor or wheel-speed sensor/sensor rotor
U1900
Can communication
U2021
Invalid/fault data received
U2516
Can communication

PID/DATA Monitor Table

PID Name

(Definition)

Unit/Condition

Condition/Specification

Action

ABS (ABS/TCS) HU/CM terminal

RPM
(Engine speed signal input)
RPM
• Engine is stopped: 0 RPM
• Engine is running: Indicates engine speed
Inspect PCM.
-
CCNTABS
(Number of continuous codes)
-
• DTC is detected: 1-255
• DTC is not detected: 0
Perform inspection using appropriate DTC.
-
PMPSTAT
(Pump motor output state)
ON/OFF
• Pump motor is activated: ON
• Pump motor is deactivated: OFF
Inspect ABS (ABS/TCS) HU/CM.
-
BOO_ABS
(Brake pedal switch input)
ON/OFF
• Brake pedal is depressed: ON
• Brake pedal is released: OFF
Inspect brake switch.
Y
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.
-
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.
-
ABSRR_O
(Right rear 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_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_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.
-
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.
-
ABSRR_I
(Right rear 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.
-
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.
-
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.
-
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.
-
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.
-
ABSPMPRLY
(Motor relay output state)
ON/OFF
• Motor relay is activated: ON
• Motor relay is deactivated: OFF
Inspect ABS (ABS/TCS) HU/CM.
-
LF_WSPD
(Left front wheel-speed sensor input)
KPH or MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect wheel-speed sensor/sensor rotor.
I, E
RF_WSPD
(Right front wheel-speed sensor input)
KPH or MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect wheel-speed sensor/sensor rotor.
G, D
LR_WSPD
(Left rear wheel-speed sensor input)
KPH or MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect wheel-speed sensor/sensor rotor.
C, F
RR_WSPD
(Right rear wheel-speed sensor input)
KPH or MPH
• Vehicle is stopped: 0 KPH {0 MPH}
• Vehicle is driving: Indicates vehicle speed
Inspect wheel-speed sensor/sensor rotor.
A, B
ABS_VOLT
(System battery voltage value)
V
• Ignition key at ON: B+
• Idle: Approx. 14-16 V
Inspect power supply circuit.
Z

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