Dodge Ram Truck 1500-2500-3500. Manual — part 144

*APS VERIFICATION TEST — VER 1

Diagnostic Test

1.

*APS VERIFICATION TEST — VER 1

Turn the ignition off.

Connect all previously disconnected components and connectors.

Ensure all accessories are turned off and the battery is fully charged.

Ensure that the Ignition is on, and with the DRBIII

T

, erase all Diagnostic Trouble Codes from ALL modules. Start the

engine and allow it to run for 2 minutes and fully operate the system that was malfunctioning.

Turn the ignition off and wait 5 seconds. Turn the ignition on and using the DRBIII, read DTC’s from ALL modules.

If any Diagnostic Trouble Codes are present, return to Symptom list and troubleshoot new or recurring symptom.

If there are no DTC’s present after turning ignition on, road test the vehicle for at least 5 minutes. Perform several
antilock braking stops.

CAUTION: Ensure braking capability is available before road testing.
Again, with the DRBIII

T

read DTC’s. If any DTC’s are present, return to Symptom list.

If there are no Diagnostic Trouble Codes (DTC’s) present, and the customer’s concern can no longer be duplicated,
the repair is complete.

Are any DTC’s present or is the original concern still present?

Yes

>> Perform the appropriate diagnostic procedure(s).

No

>> Test Complete

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BRAKES - ABS - ELECTRICAL DIAGNOSTICS

DR/DH

BODY STYLE MISMATCH — 85

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition on.

•

Set Condition:
When both the traceability code number and body style can not be read from the NVRAM or they are invalid.

Possible Causes

WRONG CAB OR CAB NOT PROGRAMMED FROM THE FACTORY

Diagnostic Test

1.

DTC VERIFICATION

NOTE: Diagnose and repair any Powertrain Control Module VIN or Communication DTCs before continuing
with this test.
Turn the ignition on.

With the scan tool, clear DTCs.

Turn the ignition off.

Turn the ignition on.

With the scan tool, select View DTCs.

Does the DTC reset?

Yes

>> Replace the Controller Antilock Brake in accordance with the Service Information. Refer to the symptom

*Replacing the Controller Antilock Brake for additional information.

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

No

>> Use the scan tool to read DTCs in all other modules. If any communication DTCs are present, perform

the appropriate diagnostic procedure. Refer to any Technical Service Bulletins that apply. If no problems
are found, test is complete.

DR/DH

BRAKES - ABS - ELECTRICAL DIAGNOSTICS

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BRAKE SWITCH CIRCUIT — 81

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BRAKES - ABS - ELECTRICAL DIAGNOSTICS

DR/DH

BRAKE SWITCH CIRCUIT — 81 (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition on.

•

Set Condition:
Continuous brake applied signal after ignition turn-on and remaining with sensed speed above 37.5 MPH
(RWAL) or 15 MPH (ABS) for over 10 seconds and/or ABS active for at least a second with brake switch
released and never sensed brake applied since power up.

Possible Causes

INTERMITTENT BRAKE SWITCH CIRCUIT DTC

BRAKE SWITCH SIGNAL CIRCUIT SHORT TO VOLTAGE

BRAKE SWITCH SIGNAL CIRCUIT OPEN

GROUND CIRCUIT OPEN

BRAKE LAMP SWITCH

CAB

Diagnostic Test

1.

VERIFY THE CONDITION

NOTE: Driving with the brake applied may set this code.
Turn the ignition off.

Ensure all accessories are turned off and the battery is fully charged.

Turn the ignition on.

With the scan tool, monitor the status of the brake switch while pressing and releasing the brake pedal several
times.

With the scan tool, erase DTCs.

CAUTION: Determine that braking capability is available before road testing the vehicle.
Road test the vehicle for at least 5 minutes over 40 MPH. Perform several anti-lock braking stops.

With the scan tool, read DTCs.

Does the original DTC reset and/or does intermittent brake switch operation occur?

Yes

>> Go To 2

No

>> The condition necessary to set this DTC is not present at this time. Using the wiring diagram/schematic

as a guide, inspect the wiring and connectors relative to this circuit.

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

DR/DH

BRAKES - ABS - ELECTRICAL DIAGNOSTICS

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