Circuit Description
The speed sensor used on this vehicle is a multiple pole magnetic pickup. This sensor produces an AC signal that the EBCM/EBTCM uses the frequency from to calculate the wheel speed.
Conditions for Setting the DTC
The DTC will set if the left rear wheel speed = 0 and the other wheel speeds are greater than 8 Km/h (5 mph) for 2.5 seconds.
This DTC can only be set with the following conditions:
| • | When DTC C1232 through C1235 are not set as a current DTC(s). |
| • | Vehicle is not in an ABS stop. |
| • | Brake switch is off. |
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | The ABS/TCS disables. |
| • | The ABS/TCS indicator(s) turn on. |
Conditions for Clearing the DTC
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. |
| • | 100 ignition cycles have passed with no DTC(s) 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 Intermittents and Poor Connections Diagnosis 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 | Did DTC C1234 set as a current or history DTC? | -- | ||
3 |
Is physical damage of sensor evident? | -- | ||
4 | Replace wheel speed sensor. Refer to Wheel Speed Sensor Replacement . Is the repair complete? | -- | -- | |
5 | Inspect the WSS jumper harness for physical damage. Is physical damage to the jumper harness evident? | -- | ||
6 | Replace wheel speed sensor jumper harness. Refer to Wheel Speed Sensor Jumper Harness Replacement . Is the repair comnplete? | -- | -- | |
Is the resistance within the range specified in the value(s) column? | 850-1350 ohms | |||
8 |
Does AC voltage fall below the range specified in the value(s) column? | 100 mV | ||
Is continuity present between terminals A3 and A4 of the J 39700 Universal Pinout Box? | -- | |||
10 | Repair short between CKT(s) 884 and 885. If short is found in jumper harness, replace the jumper harness assembly. Is the repair complete? | -- | -- | |
11 |
Does DTC reset as a current DTC? | -- | System OK | |
12 | Replace EBCM/EBTCM. Refer to Electronic Brake Control Module/Electronic Brake and Track Control Module Replacement . Is the replacement complete? | -- | -- |
