Dodge Nitro. Manual - part 184

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.  

C121A-STEERING ANGLE SENSOR NOT INITIALIZED 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

With the ignition on. 

Set Condition: 

When the Anti-Lock Brake Module detects a low voltage at the Steering Angle Sensor or Steering Angle 
Sensor failure. 

Diagnostic Test 

1) CHECK FOR A DTC C121A-STEERING ANGLE SENSOR NOT INITIALIZED 

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. 

Road test the vehicle over 30 km/h (19 mph) for at least 30 seconds.

Possible Causes 

TERMINAL/CONNECTOR/WIRING HARNESS DAMAGE
(F943) FUSED B(+) CIRCUIT OPEN
(Z385) GROUND CIRCUIT OPEN
STEERING CONTROL MODULE

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

  

With the scan tool, read and record DTCs.

Does the scan tool display: C121A-STEERING ANGLE SENSOR NOT INITIALIZED?  

Yes  

Go to 2).  

No  

Perform the ABS INTERMITTENT CONDITION diagnostic procedure.  

2) CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE 

Check the Steering Angle Sensor installation. 

Check all related wiring for bruised, chafed, pierced, or partially broken wires. 

Check all related connectors for broken, bent, pushed out, or corroded terminals. 

Were any problems found?  

Yes  

Repair as necessary.  

Perform ABS VERIFICATION TEST.  

No  

Go to 3).  

3) CHECK THE VOLTAGE ON THE (F943) FUSED B(+) CIRCUIT

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

  

Fig. 45: Measuring Voltage Of (F943) Fused B(+) Circuit 
Courtesy of CHRYSLER LLC 

Turn the ignition off. 

Disconnect the Steering Control Module harness connector. 

Turn the ignition on. 

Measure the voltage of the (F943) Fused B(+) circuit. 

Is the voltage above 10 volts?  

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro

  

Yes  

Go to 4).  

No  

Repair the (F943) Fused B(+) circuit for an open.  

Perform ABS VERIFICATION TEST.  

4) CHECK THE RESISTANCE OF THE (Z385) GROUND CIRCUIT 

Fig. 46: Measuring Resistance Between (Z385) Ground Circuit And Ground 

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro