Isuzu N-Series. Manual — part 279
5A4-90 ABS/ASR
RR Wheel Speed Sensor Output Check Procedure
Check flow C-1-4
Step
Action
Value
YES
NO
1
1. Turn the starter switch OFF.
2. Disconnect the connector of the EHCU.
3. Jack-up the vehicle to lift the front wheels
off the floor.
4. Connect a 120
Ω resistance between the
J-177 connector terminal 12 and the
ground.
5. Apply a 9 — 16V voltage to the J-177
connector terminal 21.
6. Measure the DC voltage between the J-
177 connector terminal 1 and the ground
while turning the RR wheel half turn/sec.
Is the value within specified value?
0.2 — 4.5V
2
1. Turn the starter switch OFF.
2. Disconnect the RR wheel speed sensor
connector J-148.
3. Connect a 120
Ω resistance between the
J-148 connector terminal 2 and the
ground.
4. Apply a 9 — 16V voltage to the J-148
connector terminal 1 (sensor side).
5. Measure the DC voltage between the J-
148 connector terminal 2 and the ground
while turning the RR wheel half turn/sec.
Is the value within specified value?
0.2 — 4.5V
3
Repair the circuit for open/short circuit, and
the connector for improper connection
between the connector of EHCU and the sen-
sor connector.
Is this step completed?
—
—
4
Replace the RR wheel speed sensor.
Is this step completed?
—
—
5
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”.
5A4-92 ABS/ASR
Speed Sensor Output Check Procedure
Check flow TC-1
Used for checking the front speed sensor, or the rear
speed sensor when no DTC is set.
CAUTION:
On the vehicle that the rear tires have smaller diameter,
the rear wheel speed may be indicated a little higher
than the front wheel speed. Check the speed after driv-
ing a while at a constant speed.
Step
Action
Value
YES
NO
1
1. Connect the Tech 2.
2. Check each sensor lowest speed from
the “Wheel sensor”.
Is the sensor speed 4km/h (2 mph) or more?
—
2
Check the suspicious sensor circuit for open
circuit. (Check with shaking the wire and the
connector.)
Is the sensor circuit connection normal?
—
Replace the
speed sensor.Go
Repair.Go to
3
Check each sensor lowest speed from the
“Wheel sensor”.
Is the sensor speed 4km/h (2 mph) or more?
—
4
Check the sensor rotor.
Is the sensor rotor normal?
—
Replace the sen-
sor rotor. Go to
5
Check each sensor lowest speed from the
“Wheel sensor”.
Is the sensor speed 4km/h (2 mph) or more?
—
Repair the circuit
or connector
between the
EHCU and the
speed sensor. Go
6
Install all the components, and check that
those are installed properly.
Is this step completed?
—
Repeat “Diagnos-
tic basic flow”.
ABS/ASR 5A4-93
Rear Sensor Rotor
Components
Legend
1. Axle shaft, outer oil seal
2. Bearing lock washer, lock nut
3. Outer bearing, bearing lock nut
4. Hub and drum
5. Sensor rotor
6. Inner bearing
7. Inner oil seal
8. Rear speed sensor
9. Harness connector
Removal
• Refer to the rear speed sensor removal proce-
dure.
1. Rear sensor rotor
• Use a puller to take out the sensor rotor.
2. Inner oil seal
• Remove the inner oil seal.
3. Inner bearing
• Remove the inner bearing.
• Rotor runout must be
±0.1 mm (0.004 in) or less
with the rotor installed.
N5A2057E
N5A2071E
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