ABS HU/CM INSPECTION [L3]


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1. Disconnect the ABS HU/CM connectors.

2. Connect the negative battery cable.

3. Attach the tester lead to the ABS HU/CM wiring harness-side connector, then inspect the voltage, continuity, or resistance according to the standard (reference value) on the table.

Terminal Voltage Table (Reference)

Terminal

Signal name

Connected to

Measured item

Measured terminal (measurement condition)

Standard

Inspection item(s)

A
Ground (system)
Ground point
Continuity
A-ground point
Continuity detected
• Wiring harness (A-ground point)
B
Ground (ABS motor)
Ground point
Continuity
B-ground point
Continuity detected
• Wiring harness (B-ground point)
C
-
-
-
-
-
-
D
CAN_L
DLC-2
(CAN_L)
Continuity
D-DLC-2 terminal CAN_L
Continuity detected
• D-DLC-2 terminal CAN_L
E
-
-
-
-
-
-
F
LF wheel-speed sensor (ground)
LF wheel-speed sensor
Continuity
F-LF ABS wheel-speed sensor connector terminal A
Continuity detected
• Wiring harness (F-LF ABS wheel-speed sensor terminal A)
G
-
-
-
-
-
-
H
-
-
-
-
-
-
I
LF wheel-speed sensor (single)
ABS wheel-speed sensor (LF)
Continuity
I-LF ABS wheel-speed sensor connector terminal A
Continuity detected
• Wiring harness (I-LF ABS wheel-speed sensor connector terminal A)
J
-
-
-
-
-
-
K
-
-
-
-
-
-
L
-
-
-
-
-
-
M
-
-
-
-
-
-
N
RR wheel-speed (signal)
ABS wheel-speed sensor (RR)
Continuity
O-RR ABS wheel-speed sensor connector terminal A
Continuity detected
• Wiring harness (N-RR ABS wheel-speed sensor connector terminal A)
O
-
-
-
-
-
-
P
CAN_H
DLC-2
(CAN_H)
Continuity
P-DLC-2 terminal CAN_H
Continuity detected
• Wiring harness (P-DLC-2 terminal CAN_H)
Q
RR wheel-speed (ground)
ABS wheel-speed sensor (RR)
Continuity
C-RR ABS wheel-speed sensor connector terminal B
Continuity detected
• Wiring harness (C-RR ABS wheel-speed sensor connector terminal B)
R
-
-
-
-
-
-
S
-
-
-
-
-
-
T
Brake switch
Brake switch
Voltage
T-ground point
(Brake pedal depressed with ignition switch at ON)
B+
• Wiring harness (T-brake switch)
• Brake switch
T-ground point
(Brake pedal not depressed with ignition switch at ON)
1 V or less
U
-
-
-
-
-
-
V
-
-
-
-
-
-
W
-
-
-
-
-
-
X
-
-
-
-
-
-
Y
-
-
-
-
-
-
Z
-
-
-
-
-
-
AA
-
-
-
-
-
-
AB
-
-
-
-
-
-
AC
-
-
-
-
-
-
AD
-
-
-
-
-
-
AE
-
-
-
-
-
-
AF
LR wheel-speed (signal)
ABS wheel-speed sensor (LR)
Continuity
AF-LR ABS wheel-speed sensor connector terminal A
Continuity detected
• Wiring harness (AF-LR ABS wheel-speed sensor connector terminal A)
AG
-
-
-
-
-
-
AH
-
-
-
-
-
-
AI
LR wheel-speed (ground)
ABS wheel-speed sensor (LR)
Continuity
AI-LR ABS wheel-speed sensor connector terminal B
Continuity detected
• Wiring harness (AI-LR ABS wheel-speed sensor connector terminal B)
AJ
-
-
-
-
-
-
AK
Power supply (system)
Ignition switch
Voltage
Ignition switch on
B+
• Wiring harness (AK-ignition switch)
Ignition switch off
1 V or less
-
AL
-
-
-
-
-
-
AM
-
-
-
-
-
-
AN
-
-
-
-
-
-
AO
RF wheel-speed (signal)
ABS wheel-speed sensor (RF)
Continuity
AO-RF ABS wheel-speed sensor connector terminal A
Continuity detected
• Wiring harness (AO-RF ABS wheel-speed sensor connector terminal A)
AP
-
-
-
-
-
-
AQ
KLN
DLC-2
(KLN)
Continuity
AQ-DLC-2 terminal KLN
Continuity detected
• AQ-DLC-2 terminal KLN
AR
RF wheel-speed (ground)
ABS wheel-speed sensor (RF)
Continuity
AR-RF ABS wheel-speed sensor connector terminal B
Continuity detected
• Wiring harness (AR-RF ABS wheel-speed sensor connector terminal B)
AS
-
-
-
-
-
-
AT
Power supply
(ABS motor operation)
Battery
Voltage
Under any condition
B+
• Wiring harness (AT-battery)
AU
Power supply
(solenoid operation)
Battery
Voltage
Under any condition
B+
• Wiring harness (AU-battery)