Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 686
5A–40
BRAKE CONTROL SYSTEM
Chart B-24 Sensor Signal Input Abnormality (DTC 65)
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 EHCU 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
Sensor Signal Abnormality Criteria using
TECH 2
1. While driving, the speed of one or two wheels 25% or
more higher than that of the other wheels.
2. The speed of one or two wheels is 10 km/h (6 mph) or
more higher 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 or higher to make sure that the warning
light goes out.
It is important to verify that the correct tires are installed
on vehicle.
5A–41
BRAKE CONTROL SYSTEM
Unit Inspection Procedure
This section describes the following inspection proce-
dures referred to during “SYMPTOM DIAGNOSIS” and
“DIAGNOSIS BY ‘ABS’ WARNING LIGHT ILLUMINA-
TION PATTERN” :
without TECH 2
with TECH 2
Wheel Speed Sensor Output Inspection
Chart C-1-1 to C-1-4
Chart TC-1
Transmission SW Inspection
Chart C-2
Chart TC-2
Chart C-1-1 FL Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle, With all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning FL wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 20 and 21 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 resistance between connector (C-13) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit in
harness between
wheel speed
sensor connector
and EHCU.
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 and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
5A–42
BRAKE CONTROL SYSTEM
Chart C-1-2 FR Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning FR wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 4 and 5 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 resistance between connector (C-41) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit of
harness between
wheel speed
sensor connector
and EHCU.
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 and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
Chart C-1-3 RL Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning RL wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 22 and 23 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 resistance between connector (F-3) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit of
harness between
wheel speed
sensor connector
and EHCU.
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 and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
5A–43
BRAKE CONTROL SYSTEM
Chart C-1-4 RR Sensor Output Inspection Procedure
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Jack up the vehicle with all four wheels off the ground.
Measure the AC voltage between EHCU connector terminals
while turning RR wheel at a speed of 1 RPS:
Is voltage between EHCU connector terminals 2 and 3 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 resistance between connector (F-2) terminals 1 and 2 within
1.3k - 1.9k ohms?
Connector is
faulty, or open or
short circuit of
harness between
wheel speed
sensor connector
and EHCU.
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 and ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart.”
Go to Step 3
Chart TC-1 Sensor Output Inspection Procedure (Use TECH 2)
Step
Action
Yes
No
1
1. Connect TECH 2.
2. While driving the vehicle, check the wheel speed of each
sensor by Data List.
Is the vehicle speed value is 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 3
Repair.
Go to Step 6
3
While driving the vehicle, check the wheel speed of each sensor
by Data List.
Is the vehicle speed value is normal?
Go to Step 6
Go to Step 4
4
Check sensor roter.
Is the sensor roter normal?
Go to Step 6
Replace sensor
roter.
Go to Step 5
5
While driving the vehicle, check the wheel speed of each sensor
by Data List.
Is the vehicle speed value is normal?
Go to Step 6
Repair harness or
connector
between EHCU
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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