Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 1181
BRAKE CONTROL SYSTEM
5A–53
Chart B-24 Wheel Speed Input Abnormality (DTC 65 (Flash out) / C0238 (Serial
communications))
Sensor Signal Abnormality Criteria using TECH 2
1. While driving, the speed of one or two wheels is
25% or more higher or lower than that of the other
wheels.
2. The speed of one or two wheels is 10 km/h (6 mph)
or more higher or lower than that of the other
wheels.
3. During steady driving, wheel speed changes
abruptly.
*1 The vehicle must run on a level paved road.
NOTE: Even after repairing the faulty part the warning
light (W/L) does not go out if the vehicle is at a stop.
Turn the ignition switch to the ON position and drive the
vehicle at 12 km/h (8 mph) or higher to make sure that
the warning light goes out.
It is important to verify that the correct tires are installed
on vehicle.
Step
Action
Yes
No
1
Using TECH 2?
Go to Step 2
Go to Step 3
2
1. Connect TECH 2.
2. Select Snap shot manual trigger.
3. With wheel speed data displayed, run the vehicle when
speed has arrived at 30 km/h (18 mph).
4. Check speed data on each wheel (refer to the criterion given
below). * 1
Is the abnormal sensor condition found?
Replace.
Go to Step 8
Go to Step 3
All the sensors
should follow
the following
flowchart
(without using
TECH 2).
3
Is there play in sensor/sensor ring?
Repair.
Go to Step 8
Go to Step 4
4
Is there powdered iron sticking to sensor/sensor ring?
Repair.
Go to Step 8
Go to Step 5
5
Is there a broken tooth or indentation in sensor ring?
Replace sensor
ring.
Go to Step 8
Go to Step 6
6
Is there play in wheel bearing?
Adjust or repair.
Go to Step 8
Go to Step 7
7
Is the check wiring between sensor and coil integrated module
normal?
Replace EHCU.
Go to Step 8
Repair, and
perform system
self-check.
Go to Step 8
8
1. Reconnect all components, ensure all components are
properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
Repeat Basic
diagnostic flow
chart"
Go to Step 8
5A–54
BRAKE CONTROL SYSTEM
Unit Inspection Procedure
This section describes the following inspection
procedures referred to during Symptom Diagnosis and
Diagnosis by 'ABS' Warnig Light Illumination Pattern :
Chart C-1-1 FL Sensor Output Inspection Procedure
without TECH 2
with TECH 2
Sensor Output Inspection
Chart C-1-1 to C-1-3
Chart TC-1
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between coil integrated module
connector terminals while turning FL wheel at a speed of 1
RPS:
Is the voltage between coil integrated module connector (C-4)
terminals 2 and 10 less than 200 mV?
Go to Step 2
OK.
Go to Step 3
2
1. Disconnect the wheel speed sensor.
2. Measure resistance between the wheel speed sensor
connector terminals 1 and 2.
Is the check between connector (C-13) terminals 1 and 2 within
2.0k - 2.8k ohms? (2WD model) or 0.7k - 1.5k ohms? (4WD
model)
Connector is
faulty, or open
or short circuit
of harness
between wheel
speed sensor
connector and
coil integrated
module.
Inspect and
correct the
connector or
harness.
Go to Step 3
Wheel speed
sensor is faulty.
Replace the
wheel speed
sensor.
Go to Step 3
3
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 3
BRAKE CONTROL SYSTEM
5A–55
Chart C-1-2 FR Sensor Output Inspection Procedure
Chart C-1-3 Rear Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between coil integrated module
connector terminals while turning FR wheel at a speed of 1
RPS:
Is the voltage between coil integrated module connector (C-4)
terminals 3 and 11 less than 200 mV?
Go to Step 2
OK.
Go to Step 3
2
1. Disconnect the wheel speed sensor.
2. Measure resistance between the wheel speed sensor
connector terminals 1 and 2.
Is the check between connector (C-33) terminals 1 and 2 within
2.0k - 2.8k ohms? (2WD model) or 0.7k - 1.5k ohms?
Connector is
faulty, or open
or short circuit
of harness
between wheel
speed sensor
connector and
coil integrated
module.
Inspect and
correct the
connector or
harness.
Go to Step 3
Wheel speed
sensor is faulty.
Replace the
wheel speed
sensor.
Go to Step 3
3
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 3
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Jack up the vehicle with all four wheels off the ground
measure the AC voltage between coil integrated module
connector terminals while turning Rear wheel at a speed of 1
RPS:
Is the check between coil integrated module connector (C-4)
terminals 4 and 12 than under 200 mV?
Go to Step 2
OK.
Go to Step 3
2
1. Disconnect the wheel speed sensor.
2. Measure resistance between the wheel speed sensor
connector terminals 1 and 2.
Is the check between connector (F-4) terminals 1 and 2 within
1.0k - 1.7k ohms?
Connector is
faulty, or open
or short circuit
of harness
between wheel
speed sensor
connector and
coil integrated
module.
Inspect and
correct the
connector or
harness.
Go to Step 3
Wheel speed
sensor is faulty.
Replace the
wheel speed
sensor.
Go to Step 3
3
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 3
5A–56
BRAKE CONTROL SYSTEM
Chart TC-1 Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Connect TECH 2.
2. Check the wheel speed of each sensor by Data List.
Is the vehicle speed normal?
Go to Step 6
Go to Step 2
2
Check the sensor harness for suspected disconnection (check
while shaking harness/connector).
Is the sensor harness connection normal?
Replace speed
sensor.
Go to Step 4
Repair.
Go to Step 3
3
Check the wheel speed of each sensor by Data List.
Is the vehicle speed normal?
Go to Step 6
Go to Step 4
4
Check the sensor rotor.
Is the sensor rotor normal?
Replace speed
sensor.
Go to Step 5
Replace sensor
rotor.
Go to Step 5
5
Check the harness between coil integrated module and speed
sensor.
Is the harness connection normal?
Go to Step 6
Repair harness
or connector
between coil
integrated
module and
speed sensor.
Go to Step 6
6
Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 6
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