Dodge Ram Truck 1500-2500-3500. Manual — part 158
NO SIGNAL FROM REAR SENSOR - 36
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BRAKES - ABS - ELECTRICAL DIAGNOSTICS
DR/DH
NO SIGNAL FROM REAR SENSOR - 36 (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ingition on.
•
Set Condition:
One sensor is unable to reach 4 MPH while the remaining sensors are indicating above 8 MPH.
Possible Causes
INTERMITTENT REAR WHEEL SPEED SENSOR DTC
REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORT TO GROUND
REAR WHEEL SPEED SENSOR (-) CIRCUIT SHORT TO GROUND
REAR WHEEL SPEED SENSOR (+) CIRCUIT OPEN
REAR WHEEL SPEED SENSOR (-) CIRCUIT OPEN
REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO THE REAR WHEEL SPEED SENSOR (-) CIRCUIT
TONE WHEEL
EXCESSIVE REAR WHEEL SPEED SENSOR AIR GAP
WHEEL BEARING/REAR DIFFERENTIAL
REAR WHEEL SPEED SENSOR
CONTROLLER ANTI-LOCK BRAKE
Diagnostic Test
1.
DTC IS ACTIVE
Turn the ignition on.
With the DRBIII
T
, clear DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII
T
, read DTCs.
Does the DRBIII
T
display the DTC?
Yes
>> Go To 2
No
>> Go To 15
2.
WHEEL SPEED SENSOR INSPECTION
Turn the ignition off.
Inspect the Wheel Speed Sensor for proper mounting.
Inspect the Wheel Speed Sensor harness and connector.
Inspect the Wheel Speed Sensor for excessive debris on the sensor.
Were any problems found?
Yes
>> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES/ELECTRICAL - DIAGNOSIS AND
TESTING)
No
>> Go To 3
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BRAKES - ABS - ELECTRICAL DIAGNOSTICS
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NO SIGNAL FROM REAR SENSOR - 36 (CONTINUED)
3.
TONE WHEEL DAMAGED/MISSING
Inspect the Tone Wheel in accordance with the Service Information.
NOTE: The Tone Wheel Teeth should be perfectly square, not bent or nicked.
Were any problems found?
Yes
>> Replace the Tone Wheel in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES/ELECTRICAL - DIAGNOSIS AND
TESTING)
No
>> Go To 4
4.
EXCESSIVE WHEEL SPEED SENSOR AIR GAP
Measure the Wheel Speed Sensor Air Gap in accordance with the Service Information.
Were any problems found?
Yes
>> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES/ELECTRICAL - DIAGNOSIS AND
TESTING)
No
>> Go To 5
5.
WHEEL BEARING/REAR DIFFERENTIAL
Inspect the wheel bearings for excessive run out or improper clearance in accordance with the Service Information.
Inspect the rear differential for proper operating. Refer to the Service information.
Were any problems found?
Yes
>> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES/ELECTRICAL - DIAGNOSIS AND
TESTING)
No
>> Go To 6
6.
REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO
GROUND
Turn the ignition off.
Disconnect the Rear Wheel Speed Sensor harness connector.
Disconnect the Controller Anti-lock Brake harness connector.
NOTE: Check connector - Clean/repair as necessary.
Measure the resistance between the Rear Wheel Speed Sensor (+)
circuit and ground.
Is the resistance above 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the Rear Wheel Speed Sensor (+) circuit for a
short to ground.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)
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BRAKES - ABS - ELECTRICAL DIAGNOSTICS
DR/DH
NO SIGNAL FROM REAR SENSOR - 36 (CONTINUED)
7.
REAR WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO GROUND
Measure the resistance between the Rear Wheel Speed Sensor (-) cir-
cuit and ground.
Is the resistance above 5.0 ohms?
Yes
>> Go To 8
No
>> Repair the Rear Wheel Speed Sensor (-) circuit for a short
to ground.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)
8.
REAR WHEEL SPEED SENSOR (+) CIRCUIT OPEN
Measure the resistance of the Rear Wheel Speed Sensor (+) circuit.
Is the resistance below 5.0 ohms?
Yes
>> Go To 9
No
>> Repair the open Rear Wheel Speed Sensor (+) circuit.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)
DR/DH
BRAKES - ABS - ELECTRICAL DIAGNOSTICS
5 - 63
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