DTC 05

Four Wheel Drive Antilock Brake System Schematic:

Diagnostic Trouble Code (DTC) 5, Excessive Dump Valve Actuations During An Antilock Stop:

CIRCUIT DESCRIPTION
A Diagnostic Trouble Code (DTC) 5 relates to a condition where the Electronic Brake Control Module (EBCM) is having to cycle the dump valve too many times during an anti lock stop. A mechanical locking condition in the rear brakes or powertrain can cause this Diagnostic Trouble Code (DTC) to set. This DTC can also be set if the Rear Wheel Antil Lock (RWAL) system is working with the vehicle in 4WD.

TEST DESCRIPTION
Check if the rear brakes or powertrain are causing the malfunction. This test only applies to vehicles with 4WD.
- Check if the front axle switch can turn on the 4WD indicator on the instrument cluster.
- Check if the voltage is present in CKT 420.
- Check the operation of the front axle switch.
- Check for the 4WD voltage signal at the EBCM.

DIAGNOSTIC AIDS

CAUTION: Do not pierce the electrical connectors, wires, seals, or insulation during testing. Doing so will break the seal and lead to corrosion and failure of the wiring and terminals.