Isuzu N-Series. Manual — part 269
5A4-50 ABS/ASR
DTC:C0245 (Flash Code 45) Solenoid Monitor Circuit Fault
Check flow B-12
Step
Action
Value
YES
NO
1
Replace the EHCU.
Is this step completed?
—
2
1. Install all the components, and check that
those are installed properly.
2. Clear the DTC.
3. Test run the vehicle.
Is this step completed?
—
Go to “Diagnostic
basic flow”.
ABS/ASR 5A4-51
DTC:C0251 (Flash Code 51) Speed Sensor Open/Short Circuit; FL
Check flow B-13
Step
Action
Value
YES
NO
1
1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Measure the resistance between the J-
177 connector terminals 32 and 33.
Is the value within specified value?
1 — 2k
Ω
2
Measure the resistance between the J-177
connector terminals 32 and the ground.
Is the value within specified value?
1000k
Ω or
more
3
1. Disconnect the FL wheel speed sensor
connector.
2. Measure the resistance between the J-75
connector terminals 1 and 2 (sensor
side).
Is the value within specified value?
1 — 2
Ω
4
1. Disconnect the FL wheel speed sensor
connector.
2. Measure the resistance between the J-75
connector terminal 1 (sensor side) and
the ground.
Is the value within specified value?
1000k
Ω or
more
5
Repair the circuit for open/short circuit
between the control unit connector and the
sensor connector.
Is this step completed?
—
—
6
Replace the FL wheel speed sensor.
Is this step completed?
—
—
7
Replace the control unit.
Is this step completed?
—
—
8
1. Install all the components, and check that
those are installed properly.
2. Clear the DTC.
Is this step completed?
—
Go to “Diagnostic
basic flow”.
5A4-52 ABS/ASR
DTC:C0252 (Flash Code 52) Speed Sensor Open/Short Circuit; FR
Check flow B-14
Step
Action
Value
YES
NO
1
1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Measure the resistance between the J-
177 connector terminals 10 and 11.
Is the value within specified value?
1 — 2k
Ω
2
Measure the resistance between the J-177
connector terminals 10 and the ground.
Is the value within specified value?
1000k
Ω or
more
3
1. Disconnect the FR wheel speed sensor
connector.
2. Measure the resistance between the J-74
connector terminals 1 and 2 (sensor
side).
Is the value within specified value?
1 — 2k
Ω
4
1. Disconnect the FR wheel speed sensor
connector.
2. Measure the resistance between the J-74
connector terminal 1 (sensor side) and
the ground.
Is the value within specified value?
1000k
Ω or
more
5
Repair the circuit for open/short circuit
between the control unit connector and the
sensor connector.
Is this step completed?
—
—
6
Replace the FR control unit.
Is this step completed?
—
—
7
Replace the control unit.
Is this step completed?
—
—
8
1. Install all the components, and check that
those are installed properly.
2. Clear the DTC.
Is this step completed?
—
Go to “Diagnostic
basic flow”.
ABS/ASR 5A4-53
DTC:C0253 (Flash Code 53) Speed Sensor Open/Short Circuit; RL
Check flow B-15
Step
Action
Value
YES
NO
1
1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU
and the RL wheel speed sensor connec-
tor J-149.
3. Check for continuity between the J-177
connector terminal 34 and the J-149 sen-
sor connector terminal 2.
Is there continuity?
—
2
Check for continuity between the J-177 con-
nector terminals 34 and 1.
Is there continuity?
—
3
Check for continuity between the J-177 con-
nector terminal 22 and the J-149 sensor con-
nector terminal 1.
Is there continuity?
—
4
Check for continuity between the J-177 con-
nector terminals 22 and 1.
Is there continuity?
—
5
1. Connect the connector of the EHCU.
2. Turn the starter switch ON.
3. Measure the voltage between the J-149
sensor connector terminal 1 and the
ground.
Is the value within specified value?
9 — 16V
6
Check the RL wheel speed sensor output.
(Refer to the check flow C-1-3.)
Is the fail corrected?
—
7
Repair the circuit for open/short circuit, and
the connector for improper connection
between the connector of EHCU and the
speed sensor connector.
Is this step completed?
—
8
Replace the control unit.
Is this step completed?
—
9
1. Install all the components, and check that
those are installed properly.
2. Clear the DTC.
Is this step completed?
—
Go to “Diagnostic
basic flow”.
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