2007 ISUZU KB P190 FLASH CODE

5A -1 BR AKE CON TROL SY STE M
Brake (E BD) Warning Lamp ......................................................................................... 5 A -25
Tech 2 Scan Tool .......................................................................................................... 5 A -2 6
Da ta List ( T ech 2 ).......................................................................................................... 5 A -32
Diagnostic Trouble Codes ................................................................................................ 5 A -33
Diagnosis By " A BS" Warning Lamp Illumination Patter n.............................................. 5 A -35
Basic Diagnostic Flow Chart ............................................................................................ 5 A -38
Basic Inspec tion Procedure ............................................................................................. 5 A -40
1. Basic Inspec tion of Ser vice Brake .......................................................................... 5 A -40
2. Ground Inspection .................................................................................................... 5 A -40
W heel Speed Sensor Inspec tion Procedure.................................................................... 5 A -41
Symptom Diagnosis .......................................................................................................... 5A- 42
ABS Works Frequently But Vehicle Does Not Decelerate ......................................... 5A-42
Uneven Braking Occurs While ABS Works ................................................................ 5A-43
The Wheels Are Locked................................................................................................ 5A-43
Brake Pedal Feed Is Abnormal .................................................................................... 5A-44
Braking Sound (From EHCU) Is Heard While Not Braking ........................................ 5A-45
No ABS Warning Lamp ................................................................................................. 5A-46
ABS Warning Lamp ON Steady.................................................................................... 5A-47
DTC C0221 (Flash Code 21) Front Right Wheel Speed Sensor
Short Circuit or Circuit Open ......................................................................................... 5A-48
DTC C0222 (Flash Code 22) Front Right Wheel Speed Sensor Signal Malfunction..... 5A-50
DTC C0225 (Flash Code 25) Front Left Wheel Speed Sensor Short Circuit or
Circuit Open ................................................................................................................ .... 5A-52
DTC C0226 (Flash Code 26) Front Left Wheel Speed Sensor Signal Malfunction ....... 5A-54
DTC C0231 (Flash Code 31) Rear Right Wheel Speed Sensor Short Circuit or
Circuit Open ................................................................................................................ .... 5A-56
DTC C0232 (Flash Code 32) Rear Right Wheel Speed Sensor Signal Malfunction ...... 5A-58
DTC C0235 (Flash Code 35) Rear Left Wheel Speed Sensor Short Circuit or
Circuit Open ................................................................................................................ .... 5A-60
DTC C0236 (Flash Code 36) Rear Left Wheel Speed Sensor Signal Malfunction ........ 5A-62
DTC C0238 (Flash Code 38) Front Speed Sensor Correlation ....................................... 5A-64
DTC C0241 (Flash Code 41) Front Right Hold Solenoid Valve Circuit .......................... 5A-66
DTC C0242 (Flash Code 42) Front Right Release Solenoid Valve Circuit..................... 5A-66
DTC C0245 (Flash Code 45) Front Left Hold Solenoid Valve Circuit ............................. 5A-68
DTC C0246 (Flash Code 46) Front Left Release Solenoid Valve Circuit ....................... 5A-68

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ISUZU KB P190 2007

BRAKE CON TROL SY STE M 5 A-2
DTC C0251 (Flash Code 51) Rear Hold Solenoid Valve Circuit ..................................... 5A-70
DTC C0252 (Flash Code 52) Rear Release Solenoid Valve Circuit ................................ 5A-70
DTC C0265 (Flash Code 65) Valve Relay Circuit Malfunction ........................................ 5A-72
DTC C0267 (Flash Code 67) Return Pump Circuit Malfunction ..................................... 5A-74
DTC C0271 (Flash Code 71) ECU Malfunction ................................................................ 5A-76
DTC C0276 (Flash Code 76) G Sensor Malfunction ........................................................ 5A-78
DTC C0277 (Flash Code 77) System Voltage Low .......................................................... 5A-80
DTC C0278 (Flash Code 78) System Voltage High.......................................................... 5A-80
DTC C0282 (Flash Code 82) 4 Wheel Drive State Input Signal Failure.......................... 5A-82
DTC C0285 (Flash Code 85) Control Module Vehicle Options Incorrect ...................... 5A-84
Special Tools .................................................................................................................. ... 5A-86


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ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-33
Diagnostic Trouble Codes
Choose and trace an appropriate flowchart by the
numbers listed below to find the fault and repair.
Note:
A DTC cannot be erased when the DTC is present.
Warning Lamp System Control Main Items
DTC
(Flash Code) Description
ABS Brake
(EBD) ABS EBD

-
(12) Normal Condition
× × -
C0221
(21) Front Right W heel Speed Sensor
Short Circuit or Circuit Open ×*A × Sensor or W iring
C0222
(22) Front Right W heel Speed Sensor
Signal Malfunction *B ×*A × Sensor or install condition
C0225
(25) Front Left W heel Speed Sensor Short
Circuit or Circuit Open ×*A × Sensor or W iring
C0226
(26) Front Left W heel Speed Sensor Signal
Malfunction *B ×*A × Sensor or install condition
C0231
(31) Rear Right W heel Speed Sensor Short
Circuit or Circuit Open ×*A × Sensor or W iring
C0232
(32) Rear Right W heel Speed Sensor
Signal Malfunction *B ×*A × Sensor or install condition
C0235
(35) Rear Left W heel Speed Sensor Short
Circuit or Circuit Open ×*A × Sensor or W iring
C0236
(36) Rear Left W heel Speed Sensor Signal
Malfunction *B ×*A × Sensor or install condition
C0238
(38) Front Speed Sensor Correlation
× × Vehicle , Sensor or Tire
C0241
(41) Front Right Hold Solenoid Valve Circuit
× × Solenoid (EHCU)
C0242
(42) Front Right Release Solenoid Valve
Circuit × × Solenoid (EHCU)
C0245
(45) Front Left Hold Solenoid Valve Circuit
× × Solenoid (EHCU)
C0246
(46) Front Left Release Solenoid Valve
Circuit × × Solenoid (EHCU)
C0251
(51) Rear Hold Solenoid Valve Circuit
× × Solenoid (EHCU)
C0252
(52) Rear Release Solenoid Valve Circuit
× × Solenoid (EHCU)
×
C0265
(65) Valve Relay Circuit Malfunction
×

× Relay (EHCU)
C0267
(67) Return Pump Circuit Malfunction
× Motor (EHCU)
C0271
(71) ECU Malfunction
× × EHCU
C0276
(76) G Sensor Malfunction
× × Sensor or W iring

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ISUZU KB P190 2007

5A-34 BRAKE CONTROL SYSTEM
Warning Lamp System Control Main Items DTC
(Flash Code) Description
ABS Brake
(EBD) ABS EBD


× × Battery, W iring or EHCU
(less than 8V) C0277 (77) System Voltage Low

× × Battery or W iring
(less than 10V)
C0278 (78) System Voltage High
× × Battery or W iring EHCU
C0282
(82) 4 W heel Drive State Input Signal
Failure × × W iring
C0285
(85) Control Module Vehicle Options
Incorrect × × Vehicle (Sensor or EHCU)

*A : W hen three or more failures are detected, the EBD warning lamp is "ON" and control is canceled.
*B : The ABS lamp is “OFF” when the ABS lamp is “ON” after a repair, until the vehicle’s speed becomes
more than 10km/h (6mph) in the following ignition
cycle and failure is not detected.


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ISUZU KB P190 2007

5A-48 BRAKE CONTROL SYSTEM
DTC C0221 (Flash Code 21) Front 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 front right wheel speed sensor harness connector.
2. Check installation condition for front 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 front right
wheel speed sensor.
2. Check the circuit between EHCU and front 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-50 BRAKE CONTROL SYSTEM
DTC C0222 (Flash Code 22) Front Right Wheel Speed Sensor Signal
Malfunction



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 the tire for the following conditions.
• Tire specification
• W ear of the outer surface
2. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 3
3 Note:
This DTC is set when certain tire is rotated alone.

Has certain tire been rotated alone by performing for
lift-up or roller tester? - Verify repair Go to Step 4
4 Is the front right wheel bearing rattling?
- Go to Step 11 Go to Step 5
5 Is the front right wheel speed sensor or the sensor
rotor rattling? - Go to Step 12 Go to Step 6
6 Is iron powder attached to the front right wheel speed
sensor or the sensor rotor? - Go to Step 13 Go to Step 7

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ISUZU KB P190 2007

5A-52 BRAKE CONTROL SYSTEM
DTC C0225 (Flash Code 25) Front 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 front left wheel speed sensor harness connector.
2. Check installation condition for front 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 front left
wheel speed sensor.
2. Check the circuit between EHCU and front 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-54 BRAKE CONTROL SYSTEM
DTC C0226 (Flash Code 26) Front Left Wheel Speed Sensor Signal
Malfunction



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 the tire for the following conditions.
• Tire specification
• W ear of the outer surface
2. If a problem is found, repair as necessary. W as a problem found? - Verify repair Go to Step 3
3 Note:
This DTC is set when certain tire is rotated alone.

Has certain tire been rotated alone by performing for
lift-up or roller tester? - Verify repair Go to Step 4
4 Is the front right wheel bearing rattling?
- Go to Step 11 Go to Step 5
5 Is the front right wheel speed sensor or the sensor
rotor rattling? - Go to Step 12 Go to Step 6
6 Is iron powder attached to the front left wheel speed
sensor or the sensor rotor? - Go to Step 13 Go to Step 7

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ISUZU KB P190 2007