Traction Off Indicator Always On
Traction Off Indicator Always On
Test 1-5
Test 6-14
Test 15-23
Circuit Description
The EBCM turns OFF the traction off indicator by applying ground to the service traction control signal circuit. When the inverting driver module detects the service traction control signal circuit is open, the inverting driver module applies ground to the traction off indicator control circuit in order to illuminate the traction off indicator.
Diagnostic Aids
The traction control system can be controlled by the operator in the following ways:
^ Through operation of the traction control switch.
^ Through programming of the traction control system automatic engagement feature.
Depending on the programmed state, the operation of the traction control system, as well as the operation of the traction off and low traction indicators, differs.
Observe the data list parameters listed below in order to determine the status of the traction control system when it is unknown if the system is operational.
^ Traction Control Enabled
^ Traction Off Lamp Command
Press the traction control switch and observe the scan tool in order to verify a change in the status of the data list parameters.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
6. This step tests if the EBCM is commanding the inverting driver module to turn OFF the traction off indicator.
7. This step tests if the inverting driver module is receiving adequate power and ground in order to power up.
9. This step tests if the inverting driver module is falsely illuminating the traction off indicator.
10. This step tests the service traction control signal circuit for a short to ground by substituting the IPC with a test lamp.
11. This step simulates pressing and releasing a properly functioning traction control switch.
14. The traction control switch may be damaged if the traction control switch signal circuit is shorted to voltage.