Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. 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