Dodge Nitro. Manual - part 186

PERFORMANCE 

Turn the ignition on. 

With the scan tool, read and record DTCs. 

With the scan tool, read and record Freeze Frame information. 

With the scan tool, erase DTCs. 

Start the engine. 

Slowly depress and release the brake pedal. 

With the scan tool, read and record DTCs. 

Does the scan tool display: C121E-BRAKE PRESSURE SENSOR COMPARATIVE 
PERFORMANCE?  

Yes  

Go to 2).  

No  

Refer to the ABS INTERMITTENT CONDITION.  

2) HCU/ECU ISOLATION 

Turn the ignition off. 

Separate the ECU from the HCU. 

With the scan tool, monitor brake pressure. 

Does the scan tool display brake pressure above 218 bar (3162 psi)?  

Yes  

Replace the HCU in accordance with the Service Information.  

Perform ABS VERIFICATION TEST.  

No  

Replace the ECU in accordance with the Service Information. 

NOTE:

This DTC must be active for the results of this test to be valid.

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro

  

Perform ABS VERIFICATION TEST.  

C1231-DRIVE TEST: STEERING ANGLE SENSOR 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

During the Drive Test. 

Set Condition: 

If the Anti-Lock Brakes Module detects implausible Steering Angle Sensor data. 

Diagnostic Test 

1) CHECK FOR A DTC C1231-DRIVE TEST: STEERING ANGLE SENSOR 

DTC C1219-STEERING ANGLE SENSOR ERRATIC PERFORMANCE 

DTC C123F-STEERING ANGLE SENSOR COMPARATIVE PERFORMANCE 

DTC C1240-STEERING ANGLE SENSOR ANGLE OVERTRAVEL PERFORMANCE 

Turn the ignition on. 

With the scan tool, read and record DTCs. 

With the scan tool, read and record Freeze Frame information. 

Perform ECU initialization with drive test. Perform ABS VERIFICATION TEST.  

NOTE: The drive test requires a 90° turn.  

Start the engine. 

Possible Causes 

STEERING ANGLE SENSOR INSTALLATION
STEERING ANGLE SENSOR
ANTI-LOCK BRAKES MODULE

NOTE:

This DTC must be active for the results of this test to be valid.

NOTE:

If any of the following DTCs are present they must be repaired before 
continuing.

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro

  

With the scan tool, read and record DTCs.

Does the scan tool display: C1231-DRIVE TEST: STEERING ANGLE SENSOR?  

Yes  

Go to 2).  

No  

Refer to the ABS INTERMITTENT CONDITION.  

2) VERIFY THAT THE STEERING ANGLE SENSOR IS ACTIVE ON THE BUS 

With the scan tool, select Steering Control Module. 

Verify that the Steering Angle Sensor is active on the bus. 

Is the Steering Angle Sensor active on the bus?  

Yes  

Go to 3).  

No  

Refer to DIAGNOSIS AND TESTING for No Response related diagnostic procedures.  

3) CHECK STEERING ANGLE 

Turn steering wheel so wheels point in a straight ahead position. 

With scan tool check steering angle. 

Is the Steering Angle reading within ±15 degrees?  

Yes  

Go to 4).  

No  

Go to 5).  

4) CHECK STEERING ANGLE CHANGE 

Turn steering wheel so wheels point in a straight ahead position. 

With scan tool check steering angle. 

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro

  

Slowly rotate steering wheel while looking for a smooth change. The degrees will decrease to the right 
and increase when rotating steering wheel to the left. 

Did the steering angle change accordingly?  

Yes  

Replace the Anti-Lock Brake Module in accordance with the Service Information.  

Perform ABS VERIFICATION TEST.  

No  

Replace the Steering Angle Sensor in accordance with the Service Information and clear offsets by 
initializing ECU with wheels pointing straight ahead.  

Perform ABS VERIFICATION TEST.  

5) CHECK STEERING ANGLE SENSOR INSTALLATION 

Turn the ignition off. 

Verify that the Steering Angle Sensor is properly installed. Refer to INSTALLATION . 

Is the Steering Angle Sensor properly installed?  

Yes  

Replace the Anti-Lock Brake Module in accordance with the Service Information.  

Perform ABS VERIFICATION TEST.  

No  

Repair as necessary and clear offsets by initializing ECU with wheels pointing straight ahead.  

Perform ABS VERIFICATION TEST. 

WARNING:

To avoid personal injury or death, on vehicles equipped with 
airbags, disable the supplemental restraint system before attempting 
any steering wheel, steering column, airbag, occupant classification 
system, seat belt tensioner, impact sensor, or instrument panel 
component diagnosis or service. Disconnect and isolate the battery 
negative (ground) cable, then wait two minutes for the system 
capacitor to discharge before performing further diagnosis or 
service. This is the only sure way to disable the supplemental 
restraint system. Failure to take the proper precautions could result 
in accidental airbag deployment.

NOTE:

Proper Steering Angle Sensor installation is crucial for proper operation.

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro