Isuzu N-Series. Service manual — part 275
5A4-74 ABS/ASR
Speed Sensor (Front)
Components
Legend
1. Speed sensor (model with rigid suspension)
2. Hub cap
3. Cotter pin
4. Hub nut
5. Thrust washer
6. Outer bearing
7. Hub & rotor assembly
8. Inner bearing
9. Sensor rotor
10. Disc caliper assembly
Removal
1. Harness connector
• Disconnect the harness connector.
2. Harness fixing bolt
• Remove the harness fixing bolt.
3. Sensor fixing bolt
• Remove the sensor fixing bolt.
4. Speed sensor (front)
Installation
CAUTION:
• Do not let the speed sensor body contact with the
sensor rotor during hub assembly. Otherwise the
parts will be damaged.
• The speed sensor body has a built-in magnet. Be
careful not to allow metallic materials attached to it.
N5A2048E
ABS/ASR 5A4-75
• Remove the speed sensor before removing the
hub & rotor assembly or the hub & drum assembly.
• Remove the speed sensor before hammering to re-
move the knuckle etc.
• Use the harness line as a reference to avoid the
harness from twisting, when installing the sensor
harness.
• To install the sensor, press-fit the sensor until the
sensor flange contacts closely with the installing
surface by your hand, and then tighten with the
bolt.
1. Speed sensor (front)
• Install the speed sensor.
2. Sensor fixing bolt
• Install the sensor fixing bolt.
Tighten:
Bolt to 22 N
⋅m (2.2 kg⋅m / 16.2 lb⋅ft)
3. Harness fixing bolt
• Install the harness fixing bolt.
Frame side
Tighten:
Bolt to 22 N
⋅m (2.2 kg⋅m / 16.2 lb⋅ft)
Tighten together with the dust cover
(model with dram brake)
Tighten:
Bolt to 15 N
⋅m (1.5 kg⋅m / 11.1 lb⋅ft)
Tighten together with the brake support
(model with rigid disc brake)
Tighten:
Bolt to 45 N
⋅m (4.6 kg⋅m / 33.2 lb⋅ft)
4. Harness connector
• Connect the harness connector.
Inspection
This section explores inspection procedures as the ref-
erence to perform “Diagnostics with symptom” and “Di-
agnosis with illumination pattern”.
FL Wheel Speed Sensor Output Check Procedure
Check flow C-1-1
Without Tech 2
With Tech 2
Speed sensor output check
Check flow C-1-1 — C-1-4
Check flow TC-1
Step
Action
Value
YES
NO
1
1. Turn the starter switch OFF.
2. Disconnect the EHCU connector.
3. Jack-up the vehicle to lift the front wheels
off the floor.
4. Measure the AC voltage between the J-
177 connector terminals 32 and 33 while
turning the FL wheel half turn/sec.
Is the value within specified value?
200mV or
more
2
1. Disconnect the FL sensor connector J-
75.
2. Measure the resistance between the J-75
connector terminals 1 and 2 (sensor
side).
Is the value within specified value?
1 — 2k
Ω
3
Replace the FL sensor.
Is this step completed?
—
—
4
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?
—
—
5A4-76 ABS/ASR
FR Wheel Speed Sensor Output Check Procedure
Check flow C-1-2
Speed Sensor Output Check Procedure (With Tech 2)
Check flow TC-1
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”.
Step
Action
Value
YES
NO
1
1. Turn the starter switch OFF.
2. Disconnect the EHCU connector.
3. Jack-up the vehicle to lift the front wheels
off the floor.
4. Measure the AC voltage between the
J177 connector terminals 10 and 11 while
turning the FR wheel half turn/sec.
Is the value within specified value?
200mV or
more
2
1. Disconnect the FR sensor connector J-
74.
2. Measure the resistance between the J-74
connector terminals 1 and 2 (sensor
side).
Is the value within specified value?
1 — 2k
Ω
3
Replace the FR sensor.
Is this step completed?
—
—
4
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?
—
—
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”.
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 (2mph) 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
Step
Action
Value
YES
NO
ABS/ASR 5A4-77
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.
3
Check each sensor lowest speed from the
“Wheel sensor”.
Is the sensor speed 4km/h (2mph) 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 (2mph) or more?
—
Repair the circuit
or circuit 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”.
Step
Action
Value
YES
NO
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