Circuit Description
The speed sensor used on this vehicle is a single point magnetic pickup. This sensor produces an AC signal that the EBTCM uses the frequency from to calculate the wheel speed.
Conditions for Setting the DTC
The DTC can be set anytime the brake is not depressed and no wheel speed sensor hardware DTCs are present, and the EBTCM sees a wheel speed variation of more than 14 Km/h (9 mph) for 2.5 seconds.
Action Taken When the DTC Sets
ABS/TCS/Active Handling (if equipped with RPO JL4) are disabled.
| • | Indicators that turn on: |
| - | ABS indicator |
| - | Car Icon (TCS indicator) |
| • | Messages displayed on the DIC: |
| - | Service ABS |
| - | Service Traction System |
| - | Service Active HNDLG (if equipped with Active Handling RPO JL4) |
Conditions for Clearing the DTC
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. |
| • | Fifty ignition cycles have passed with no DTCs detected. |
Diagnostic Aids
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation. |
| • | If an intermittent malfunction exists refer to Testing for Electrical Intermittents in Wiring Systems. |
Test Description
The numbers below refer to step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | ||
2 |
Is physical damage of sensor evident? | -- | ||
Is the resistance within the range specified in the value(s) column? | 850-1350ohms | |||
4 |
Is the AC voltage within the range specified in the value(s) column? | Above 100 mV | ||
Is the resistance within the range specified in the value(s) column? | 850-1350 ohms | |||
6 |
Does DTC reset as a current DTC? | -- | ||
7 | Replace wheel speed sensor. Refer to Wheel Hub/Speed Sensor Replacement in Front Suspension. Is the repair complete? | -- | -- | |
8 | If the resistance was low, repair short between CKTs 833 and 872. If the resistance was high, check for an open in CKTs 833 or 872. If a repair of the jumper harness is needed, replace the jumper harness. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
9 | Replace EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | -- | |
10 | Carefully test drive vehicle above 24 Km/h (15 mph) while monitoring a scan tool for at least 30 seconds. Does the DTC set as a current DTC? | -- |
