Dodge Ram Truck 1500-2500-3500. Manual — part 155

LEFT FRONT SENSOR SHORTED — 90 (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition on.

•

Set Condition:
The CAB detect high voltage on the wheel speed sensor circuit.

Possible Causes

INTERMITTENT LEFT FRONT WHEEL SPEED SENSOR DTC

LEFT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE

LEFT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE

LEFT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO THE LEFT FRONT WHEEL SPEED
SENSOR(-) CIRCUIT

TONE WHEEL

EXCESSIVE LEFT FRONT WHEEL SPEED SENSOR AIR GAP

WHEEL BEARING

LEFT FRONT WHEEL SPEED SENSOR

CONTROLLER ANTI-LOCK BRAKE

Diagnostic Test

1.

DTC IS ACTIVE

Turn the ignition on.

With the scan tool, clear DTCs.

Turn the ignition off.

Turn the ignition on.

With the scan tool, read DTCs.

Does the DRBIII

T

display the DTC?

Yes

>> Go To 2

No

>> Go To 11

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

DR/DH

LEFT FRONT SENSOR SHORTED — 90 (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 LOOSE/BINDING

Inspect the wheel bearings for excessive run out or improper clearance 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 6

6.

LEFT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED
TO VOLTAGE

Turn the ignition on.

Measure the voltage of the Left Front Wheel Speed Sensor (+) circuit.

Is there any voltage present?

Yes

>> Repair Left Front Wheel Speed Sensor (+) circuit for a

short to voltage.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

No

>> Go To 7

DR/DH

BRAKES - ABS - ELECTRICAL DIAGNOSTICS

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LEFT FRONT SENSOR SHORTED — 90 (CONTINUED)

7.

LEFT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE

Measure the voltage of the Left Front Wheel Speed Sensor (-) circuit.

Is there any voltage present?

Yes

>> Repair the Left Front Wheel Speed Sensor (-) circuit for a

short to voltage.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

No

>> Go To 8

8.

LEFT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO THE LEFT FRONT WHEEL SPEED
SENSOR (-) CIRCUIT

Turn the ignition off.

Measure the resistance between the Left Front Wheel Speed Sensor
(+) circuit and the Left Front Wheel Speed Sensor (-) circuit at the
Controller Anti-lock Brake harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Repair Left Front Wheel Speed Sensor (+) circuit for a

short to the Left Front Wheel Speed Sensor (-) circuit.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

No

>> Go To 9

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BRAKES - ABS - ELECTRICAL DIAGNOSTICS

DR/DH

LEFT FRONT SENSOR SHORTED — 90 (CONTINUED)

9.

LEFT FRONT WHEEL SPEED SENSOR

Turn the ignition off.

Connect the Left Front Wheel Speed Sensor harness connector.

Measure the resistance between the Left Front Wheel Speed Sensor (+) circuit and Left Front Wheel Speed Sensor
(-) circuit at the Controller Anti-lock Brake harness connector.

NOTE: The resistance should be approximately 1600–2300 ohms at 76 degrees F.

Is the resistance within the noted range?

Yes

>> Go to 10

No

>> Replace the Left Front Wheel Speed Sensor in accordance with the Service Information.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES/ELECTRICAL - DIAGNOSIS AND
TESTING)

10.

CONTROLLER ANTI-LOCK BRAKE

Turn the ignition off.

Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.

Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Refer to any Technical Service Bulletins that may apply.

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

>> Replace the Controller Anti-lock Brake in accordance with the Service Information.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES/ELECTRICAL - DIAGNOSIS AND
TESTING)

11.

WIRING HARNESS INSPECTION

Turn the ignition off.

NOTE: Towing the vehicle with ignition ON may set this DTC.
Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.

Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Refer to any Technical Service Bulletins that may apply.

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

>> Test Complete.

DR/DH

BRAKES - ABS - ELECTRICAL DIAGNOSTICS

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