2007 ISUZU KB P190 DTC CHECK

5A-76 BRAKE CONTROL SYSTEM
DTC C0271 (Flash Code 71) ECU Malfunction





RTW 75ALF000301
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. 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 3

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ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-77
3 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 4 Verify repair
4 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

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-79
Step Action
Value(s) Yes No
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 - 4.0V 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

5A-80 BRAKE CONTROL SYSTEM
DTC C0277 (Flash Code 77) System Voltage Low
DTC C0278 (Flash Code 78) System Voltage High





RTW 75ALF000301
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 EHCU
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 EHCU.
2. Ignition “ON”, engine “OFF”.
3. Check the supply voltage to EHCU. Is 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 -

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ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-81
Step Action
Value(s) Yes No
5 1. Check the power supply circuit.
(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
6 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 7 Verify repair
7 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

5A-82 BRAKE CONTROL SYSTEM
DTC C0282 (Flash Code 82) 4 Wheel Drive State Input Signal Failure




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 EHCU and 2-4W D control unit.
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 EHCU and 2-4W D
control unit.
2. Check the circuit between EHCU and 2-4W D control unit. (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
4 1. Check the 2-4W D Control system.
2. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 5

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ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-83
Step Action
Value(s) Yes No
5 1. Ignition "OFF".
2. Connect 2-4W D control unit.
3. Disconnect EHCU.
4. Ignition "ON," engine "OFF."
5. Install the high impedance digital multimeter.
6. Check the transfer (2-4W D control unit) signal value. (Battery voltage is more than 10V.)
W as the value normal? Transfer 2W D
Mode: 8.3Hz (± 15%)
Transfer 4W D Mode: 4.2Hz (± 15%) Go to Step 7 Go to Step 6
6 Replace 2-4W D control unit.
Is the action complete?
- Go to Step 7 -
7 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 8 Verify repair
8 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 -


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007