Dodge Nitro. Manual - part 178

No  

Test Complete.  

C1049-RIGHT REAR WHEEL PRESSURE PHASE MONITORING 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

During active ABS control. 

Set Condition: 

When the Anti-Lock Brakes Module detects a pressure reduction phase and the following pressure hold 
phase is too long. 

Diagnostic Test 

1) COMPARE WHEEL SPEED SENSOR SIGNALS 

With the scan tool, monitor ALL the WSS speeds while an assistant drives the vehicle. 

Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). 

Does the Right Rear WSS speed differ from the other WSS speeds by 8 km/h (5 mph) or show NO 
speed?  

Yes  

Go to 3).  

No  

Go to 2).  

2) CHECKING INSIDE WHEEL SPEED

Possible Causes 

RIGHT REAR TONE WHEEL DAMAGED
WHEEL SPEED SIGNALS SWAPPED
RIGHT REAR WSS
ANTI-LOCK BRAKES MODULE

WARNING:

Ensure brake capability is available before road testing.

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro

  

Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph) and perform a 90 degree turn 
while monitoring if inside wheel is slower than outside. 

Was the inside wheel slower than outside?  

Yes  

Perform the ABS INTERMITTENT CONDITION diagnostic procedure.  

No  

Go to 3).  

3) INSPECT TONE WHEEL/BEARING 

Turn the ignition off. 

Visually inspect the tone wheel and bearing for damage. 

Check the tone wheel teeth for missing teeth, cracks, and looseness. The teeth must be perfectly 
square, not bent, or nicked. Check the wheel bearing for worn/looseness.  

Were any problems found?  

Yes  

Repair as necessary.  

Perform ABS VERIFICATION TEST.  

No  

Go to 4).  

4) CHECK WHEEL SPEED SENSOR WIRING 

Check the Anti-Lock Brakes Module and Wheel Speed Sensors harness connectors for incorrectly wired 
connectors. 

Were any problems found?  

Yes  

Repair as necessary.  

Perform ABS VERIFICATION TEST.  

No  

Go to 5).  

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro

  

5) RIGHT REAR WHEEL SPEED SENSOR 

Replace the Right Rear Wheel Speed Sensor in accordance with the Service Information. 

Perform ABS VERIFICATION TEST.  

Road test the vehicle over 40 km/h (25 mph). 

With the scan tool, read ABS DTCs. 

Did DTC C1049-RIGHT REAR WHEEL PRESSURE PHASE MONITORING reset?  

Yes  

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

Perform ABS VERIFICATION TEST.  

No  

Test Complete.  

C1073-ABS PUMP MOTOR CONTROL CIRCUIT 

CAUTION: Ensure brake capability is available before road testing.

NOTE:

Vehicle must be driven above 40 km/h (25 mph) for set conditions to be 
met.

NOTE:

The Anti-Lock Brake Module must sense ALL 4 wheels at 12 km/h (7.5 
mph) before it will extinguish the ABS indicators.

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro

  

Fig. 37: ABS Pump Motor Control Circuit Schematic 
Courtesy of CHRYSLER LLC 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

 

2007 Dodge Nitro R/T 

2007 BRAKES ABS - Electrical Diagnostics - Nitro