Isuzu N-Series. Manual — part 247
ANTI-LOCK BRAKE SYSTEM (ABS) 5A4-53
Chart 15 (DTC63/C0263) Abnormal RL Speed Sensor Signal
21
1. Reconnect all components, ensure all
components are properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
—
Go to “Basic diag-
nostic flow chart”.
—
Step
Action
Value(s)
YES
NO
1
Have the vehicle been jacked up?
Have two or three wheels been turned on the
brake tester intentionally?
—
Be careful that the
system may fail if
two or three
wheels are turned
forcibly.
The flow is now
complete.
Repair tires.
2
Are tire pressures, sizes and wear normal?
—
Repair tires.
3
Is there play in the RL wheel bearing?
—
4
Is there play in the RL speed sensor/sensor
rotor?
—
5
Is there powdered iron sticking to RL speed
sensor/sensor rotor?
—
6
Check the RL speed sensor. (Refer to Chart
C-1-3 or TC-1)
Is the RL sensor output normal?
—
7
Is there a broken tooth or indentation in the
sensor rotor?
—
8
1. Clear diagnostic trouble code.
2. Test drive and perform system self-check.
Does the DTC repeat?
—
9
Is there damage or indentation in the speed
sensor?
—
10
Adjust wheel bearing preload.
Is action complete?
—
—
11
Repair or replace speed sensor/sensor rotor.
Is action complete?
—
—
12
Repair speed sensor/sensor rotor.
Is action complete?
—
—
13
Replace sensor rotor.
Is action complete?
—
—
14
Replace RL speed sensor.
Is action complete?
—
—
15
Check the RL speed sensor circuit. Refer to
Chart 11.
Is action complete?
—
Verify repair
—
Step
Action
Value(s)
YES
NO
5A4-54 ANTI-LOCK BRAKE SYSTEM (ABS)
Chart 16 (DTC64/C0264) Abnormal RR Speed Sensor Signal
16
Check for a poor connection and an open cir-
cuit on the harness between EHCU and sen-
sor connectors.
Refer to “Note on Intermittents” described in
earlier this section.
Is action complete?
—
—
17
Replace EHCU.
Is action complete?
—
—
18
1. Reconnect all components, ensure all
components are properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
—
Go to “Basic diag-
nostic flow chart”.
—
Step
Action
Value(s)
YES
NO
1
Have the vehicle been jacked up?
Have two or three wheels been turned on the
brake tester intentionally?
—
Be careful that the
system may fail if
two or three
wheels are turned
forcibly.
The flow is now
complete.
Repair tires.
2
Are tire pressures, sizes and wear normal?
—
Repair tires.
3
Is there play in the RR wheel bearing?
—
4
Is there play in the RR speed sensor/sensor
rotor?
—
5
Is there powdered iron sticking to RR speed
sensor/sensor rotor?
—
6
Check the RR speed sensor. (Refer to Chart
C-1-4 or TC-1)
Is the RR sensor output normal?
—
7
Is there a broken tooth or indentation in the
sensor rotor?
—
8
1. Clear diagnostic trouble code.
2. Test drive and perform system self-check.
Does the DTC repeat?
—
9
Is there damage or indentation in the speed
sensor?
—
10
Adjust wheel bearing preload.
Is action complete?
—
—
11
Repair or replace speed sensor/sensor rotor.
Is action complete?
—
—
12
Repair speed sensor/sensor rotor.
Is action complete?
—
—
Step
Action
Value(s)
YES
NO
ANTI-LOCK BRAKE SYSTEM (ABS) 5A4-55
13
Replace sensor rotor.
Is action complete?
—
—
14
Replace RR speed sensor.
Is action complete?
—
—
15
Check the RR speed sensor circuit. Refer to
Chart 12.
Is action complete?
—
Verify repair
—
16
Check for a poor connection and an open cir-
cuit on the harness between EHCU and sen-
sor connectors.
Refer to “Note on Intermittents” described in
earlier this section.
Is action complete?
—
—
17
Replace EHCU.
Is action complete?
—
—
18
1. Reconnect all components, ensure all
components are properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
—
Go to “Basic diag-
nostic flow chart”.
—
Step
Action
Value(s)
YES
NO
5A4-56 ANTI-LOCK BRAKE SYSTEM (ABS)
UNIT INSPECTION PROCEDURE
Unit Inspection Procedure
This section describes the following inspection procedures referred to during “SYMPTOM DIAGNOSIS” and “DIAG-
NOSS BY ‘ABS’ WARNING LIGHT ILLUMINATION PATTERN”:
Chart C-1-1 FL Speed Sensor Output Inspection Procedure
without Tech 2
with Tech 2
Speed Sensor Output Inspection
Chart C-1-1 to C-1-4
Chart TC-1
Step
Action
Value(s)
YES
NO
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle, with all wheels off the
ground.
4. Measure the AC voltage between J-177
EHCU connector terminals 32 and 33
while turning FL wheel at a speed of 0.5
RPS.
Does the DVM display a voltage within the
specified value?
200 mV or
more
2
1. Disconnect FL sensor connector.
2. Using DVM, measure the resistance be-
tween J-75 sensor connector terminals 1
and 2.
Does the DVM display a resistance within the
specified value?
1.0 — 2.0 k
ohms
3
1. Locate open circuit, poor connection or
short circuit on the harness between
EHCU and sensor connectors.
2. Repair the harness.
Is action complete?
—
—
4
Replace FL sensor.
Is action complete?
—
—
5
1. Reconnect all components, ensure all
components are properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
—
Go to “Basic diag-
nostic flow chart”.
—
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