Isuzu N-Series. Manual — part 270
5A4-54 ABS/ASR
DTC:C0254 (Flash Code 54) Speed Sensor Open/Short Circuit; RR
Check flow B-16
Step
Action
Value
YES
NO
1
1. Turn the starter switch OFF.
2. Disconnect the connector of EHCU and
the RR wheel speed sensor connector J-
148.
3. Check for continuity between the J-177
connector terminal 12 and the J-148 sen-
sor connector terminal 2.
Is there continuity?
—
2
Check for continuity between the J-177 con-
nector terminals 12 and 1.
Is there continuity?
—
3
Check for continuity between the J-177 con-
nector terminal 21 and the J-148 sensor con-
nector terminal 1.
Is there continuity?
—
4
Check for continuity between the J-177 con-
nector terminals 21 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-148
sensor connector terminal 1 and the
ground.
Is the value within specified value?
9 — 16V
6
Check the RR wheel speed sensor output.
(Refer to the check flow C-1-4.)
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”.
ABS/ASR 5A4-55
DTC:C0261 (Flash Code 61) Speed Sensor Signal Fault/Wrong Tire Size; FL
Check flow B-17
Step
Action
Value
YES
NO
1
Check the tire.
Is the tire specification correct? Is abnormal
wear found in the outer surface?
—
Replace with the
specified tire with-
out wear.Go to
2
Has certain tire been rotated alone by perfum-
ing for jack-up or roller tester?
—
DTC may be set if
certain tire is
rotated alone. Go
3
Is the FL wheel bearing rattling?
—
4
Is the FL wheel speed sensor/sensor rotor rat-
tling?
—
5
Is iron powder attached to the FL wheel speed
sensor/sensor rotor?
—
6
Check the FL wheel speed sensor. (Refer to
the check flow C-1-1 or TC-1.)
Is the FL sensor output normal?
—
7
Does the sensor rotor have missing tooth or
saw-toothed?
—
8
Measure the resistance between the B-177
connector terminals 33 and the ground.
Is the value within specified value?
1000k
Ω or
more
9
1. Clear the DTC.
2. Test run the vehicle, and perform the self-
diagnosis.
Is DTC displayed repeatedly?
—
10
Is the speed sensor damaged or saw-
toothed?
—
11
1. Disconnect the FL sensor connector.
2. Measure the resistance between the J-75
connector terminal 2 (sensor side) and
the ground.
Is the value within specified value?
1000k
Ω or
more
12
Adjust the preload of the wheel bearing.
Is this step completed?
—
—
13
Repair or replace the speed sensor/sensor
rotor.
Is this step completed?
—
—
14
Repair the speed sensor/sensor rotor.
Is this step completed?
—
—
15
Replace the sensor rotor.
Is this step completed?
—
—
16
Replace the FL wheel speed sensor.
Is this step completed?
—
—
5A4-56 ABS/ASR
17
Check the FL wheel speed sensor circuit.
(Refer to the check flow B-13.)
Is this step completed?
—
Check the repair.
—
18
Check the circuit for open circuit, and the con-
nector for improper connection between the
EHCU and the speed sensor connector. Refer
to “Intermittent trouble”.
Is this step completed?
—
—
19
Repair the circuit for open/short circuit, and
the connector for improper connection
between the EHCU connector and the speed
sensor connector.
Is this step completed?
—
20
Replace the EHCU.
Is this step completed?
—
—
21
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”.
Step
Action
Value
YES
NO
ABS/ASR 5A4-57
DTC:C0262 (Flash Code 62) Speed Sensor Signal Fault/Wrong Tire Size; FR
Check flow B-18
Step
Action
Value
YES
NO
1
Check the tire.
Is the tire specification correct? Is abnormal
wear found in the outer surface?
—
Replace with the
specified tire with-
out wear.Go to
2
Has certain tire been rotated alone by perfum-
ing for jack-up or roller tester?
—
DTC may be set if
certain tire is
rotated alone. Go
3
Is the FR wheel bearing rattling?
—
4
Is the FR wheel speed sensor/sensor rotor
rattling?
—
5
Is iron powder attached to the FR wheel
speed sensor/sensor rotor?
—
6
Check the FR wheel speed sensor. (Refer to
the check flow C-1-2 or TC-1.)
Is the FR sensor output normal?
—
7
Does the sensor rotor have missing tooth or
saw-toothed?
—
8
Measure the resistance between the B-177
connector terminal 11 and the ground.
Is the value within specified value?
1000k
Ω or
more
9
1. Clear the DTC.
2. Test run the vehicle, and perform the self-
diagnosis.
Is DTC displayed repeatedly?
—
10
Is the speed sensor damaged or saw-
toothed?
—
11
1. Disconnect the FR sensor connector.
2. Measure the resistance between the J-74
connector terminal 2 (sensor side) and
the ground.
Is the value within specified value?
1000k
Ω or
more
12
Adjust the preload of the wheel bearing.
Is this step completed?
—
—
13
Repair or replace the speed sensor/sensor
rotor.
Is this step completed?
—
—
14
Repair the speed sensor/sensor rotor.
Is this step completed?
—
—
15
Replace the sensor rotor.
Is this step completed?
—
—
16
Replace the FR wheel speed sensor.
Is this step completed?
—
—
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