2007 ISUZU KB P190 Harness

5A-56 BRAKE CONTROL SYSTEM
DTC C0231 (Flash Code 31) Rear Right Wheel Speed Sensor Short Circuit or
Circuit Open



RTW 75AMF001301

Step Action Value(s) Yes No
1 W ere the steps of the “Basic Diagnostic Flow Chart”
performed?
- Go to Step 2 Go to Basic
Diagnostic
Flow Chart
2 1. Check for a poor connection at the rear right wheel speed sensor harness connector.
2. Check installation condition for rear right wheel speed sensor.
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 3
3 1. Ignition “OFF”, disconnect the EHCU and rear right
wheel speed sensor.
2. Check the circuit between EHCU and rear right wheel speed sensor. (Circuit for an open, short to
ground, or short to voltage.)
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 4

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ISUZU KB P190 2007

5A-60 BRAKE CONTROL SYSTEM
DTC C0235 (Flash Code 35) Rear Left Wheel Speed Sensor Short Circuit or
Circuit Open



RTW 75AMF001301

Step Action Value(s) Yes No
1 W ere the steps of the “Basic Diagnostic Flow Chart”
performed?
- Go to Step 2 Go to Basic
Diagnostic
Flow Chart
2 1. Check for a poor connection at the rear left wheel speed sensor harness connector.
2. Check installation condition for rear left wheel speed sensor.
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 3
3 1. Ignition “OFF”, disconnect the EHCU and rear left
wheel speed sensor.
2. Check the circuit between EHCU and rear left wheel speed sensor. (Circuit for an open, short to
ground, or short to voltage.)
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 4

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ISUZU KB P190 2007

5A-64 BRAKE CONTROL SYSTEM
DTC C0238 (Flash Code 38) Front Speed Sensor Correlation

Step Action Value(s) Yes No
1 W ere the steps of the “Basic Diagnostic Flow Chart”
performed?
- Go to Step 2 Go to Basic
Diagnostic
Flow Chart
2 1. Check for the tire size of each wheels.
2. If the tire size is different, replace the tire.
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 3
3 1. Check for the gear ratio of a front axle differential gear and a rear axle differential gear.
2. If the gear ratio is different, repair the gear ratio.
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 4
4 Select “Display DTCs” with the Tech 2.
Note: Perform the various tests (actuator test, test
run, brake test, etc.) then observe the DTC with a
Tech 2.
Are any DTCs stored? - Go to Step 5 Verify repair
5 1. Check for a poor connection at the wheel speed sensor harness connector.
2. Check installation condition for wheel speed sensor.
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 6
6 1. Check condition for sensor rotor.
2. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 7
7 1. Ignition “OFF” disconnect the EHCU and wheel
speed sensor.
2. Check the circuit between EHCU and wheel speed sensor. (short ground, or short to voltage)
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 8
8 1. Ignition “OFF”.
2. Check the EHCU circuit for an open, short to ground, or short to voltage. Also, check the EHCU
ignition feed circuit for an open or short to ground
and the EHCU ground circuit for an open or short to
voltage.
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 9
9 1. Ignition “ON”, engine “OFF”.
2. Select “Display DTCs” with the Tech 2. Note: Perform the various tests (actuator test, test
run, brake test, etc.) then observe the DTC with a
Tech 2.
Are any DTCs stored? - Go to Step 10 Verify repair

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ISUZU KB P190 2007

5A-78 BRAKE CONTROL SYSTEM
DTC C0276 (Flash Code 76) G Sensor Malfunction




RTW 75AMF001501

Step Action Value(s) Yes No
1 W ere the steps of the “Basic Diagnostic Flow Chart”
performed?
- Go to Step 2 Go to Basic
Diagnostic
Flow Chart
2 1. Check for a poor connection at the G sensor harness connector.
2. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 3
3 1. Ignition “OFF”, disconnect the G sensor and EHCU.
2. Ignition “ON”, engine “OFF”.
3. Check the supply voltage to G sensor. W as the value normal? Battery
Voltage Go to Step 5 Go to Step 4
4 Repair or replace the power supply circuit.
Is the action complete? - Verify repair -
5 1. Check the circuit between EHCU and G sensor.
(Check circuit for an open, short to ground, or short
to voltage.)
2. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 6

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ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-85
Step Action Value(s) Yes No
4 1. Ignition "OFF".
2. Check for a poor condition at the EHCU harness connector.
3. Check the EHCU circuit for an open, short to ground, or short to voltage. Also, check the EHCU
ignition feed circuit for an open or short to ground
and the EHCU ground circuit for an open or short to
voltage.
4. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 9
5 1. Ignition "OFF", disconnect the EHCU and G sensor.
2. Check the circuit between EHCU and G sensor. (short to ground, or short to voltage.)
3. If a problem is found, repair as necessary. W as a problem found? - Verify repair
Go to Step 6 Go to Step 6
6 1. Remove the G sensor. 2. Reconnect G sensor and EHCU
3. Install the Tech 2.
4. Ignition "ON", engine "OFF".
5. Observe the G sensor reading on Tech 2. If G sensor inclines, reading voltage will change.
Is the reading voltage between specified values? 1.0 – 4.0 V Go to Step 7 Go to Step 8
7 1. Ignition "OFF". 2. Install the G sensor.
3. Install the Tech 2.
4. Ignition "ON", engine "OFF".
5. Select "Display DTCs" with the Tech 2. Are any DTCs stored? - Go to Step 8 Verify repair
8 1. Replace G sensor.
2. Select "Display DTCs" with the Tech 2. Note: Perform the various tests (actuator test, test
run, brake test, etc.) then observe the DTC with a
Tech 2.
Are any DTCs stored? - Go to Step 9 Verify repair
9 Replace EHCU.
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification ; 2W D model or 4W D model)
Is the action complete? - Verify repair -



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ISUZU KB P190 2007

ANTI-LOCK BRAKE SYSTEM 5B-7
Electronic Hydraulic Control Unit
Electronic Hydraulic Control Unit and Associated Parts



RTW 75BMF000301

Legend
(1) Flare Nut to front right wheel cylinder
(2) Flare Nut to front left wheel cylinder
(3) Electronic Hydraulic Control Unit (EHCU)
(4) Flare Nut from master cylinder front


(5) Bolt
(6) Flare Nut from master cylinder rear
(7) Flare Nut to rear wheel cylinder

Removal
1. Disconnect the harness connector.
2. Loosen five flare nuts and remove brake pipes. •
After disconnecting brake pipe, cap or tape the
openings of the brake pipe to prevent the entr
y
of foreign matter.
3. Remove three bracket fixing bolts.

Installation
1. Install EHCU and tighten the bolt to the specified
torque.
Torque: 8 N ⋅m (0.8 kgf ⋅m /69 lb·in)
2. Tighten the flare nuts to the specified torque.
Torque: 16 N ⋅m (1.6 kgf ⋅m /12 lb·ft)
3. Connect the harness connector.

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ISUZU KB P190 2007

ANTI-LOCK BRAKE SYSTEM 5B-11
Rear Wheel Speed Sensor
Rear Wheel Speed Sensor and Associated Parts
420R300008
Legend
(1) Rear Speed Sensor Assembly
(2) Bolt: Cable to frame
(3) Connector
(4) Bolt: Sensor to rear axle


(5) Speed Sensor
(6) Bolt: Cable to axle
(7) Bolt: Sensor to rear axle
(8) Speed Sensor
Removal
1. Disconnect the harness connector.
2. Remove the cable fixing bolt.
3. Disconnect the cable fixing clips (arrow marked).
4. Remove the speed sensor fixing bolts and speed sensor.
Inspection and Repair
1. Check speed sensor head for presence of foreign
materials; remove any dirt, etc.
2. Check the head for damage, and replace speed sensor if necessary.


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ISUZU KB P190 2007

5B-12 ANTI-LOCK BRAKE SYSTEM
3. Check speed sensor cable for short or open, and
replace with a new one if necessary. To check fo
r
cable short or open, bend or stretch the cable while
checking for continuity.
Installation
1. Install the speed sensor.
2. Tighten the sensor fixing bolts to the specified torque.
Torque: 8 N ⋅m (0.8 kgf ⋅m / 69 lb·in)
3. Connect the cable fixing clips (arrow marked).
4. Install the cable fixing bolts and tighten it to the specified torque.
Torque: 8 N ⋅m (0.8 kgf ⋅m / 69 lb·in)
5. Connect the harness connector.


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ISUZU KB P190 2007