Circuit Description
The WSS is a single point magnetic pickup that produces an AC signal. The EBCM/EBTCM uses the signal frequency in order to calculate the wheel speed.
Conditions for Setting the DTC
The ignition is in the RUN position and the EBCM/EBTCM senses an open, a short to ground, or a short to battery in the LR WSS circuit
Action Taken When the DTC Sets
| • | A DTC C1234 is stored |
| • | The ABS/TCS is disabled |
| • | The ABS and the TRACTION OFF indicators are turned on |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the scan tool clear DTC function is used |
| • | 50 ignition cycles have passed with no DTCs detected |
Diagnostic Aids
| • | Thoroughly inspect the wiring and the connectors. Failure to carefully and fully inspect the wiring and the connectors can result in misdiagnosis. Misdiagnosis may cause replacement of parts without repairing the malfunction. |
| • | The following conditions may cause an intermittent malfunction: |
| - | Poor connections |
| - | Broken insulation |
| - | A broken wire 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.
-
Checks for an open in the WSS or WSS CKT.
-
Checks for a short to ground in the WSS or WSS CKT.
-
Checks for a short to voltage in the WSS CKT.
-
Checks for a short to voltage in the WSS CKT.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 |
Is physical damage of sensor evident? | -- | ||
3 | Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
Is the resistance within the specified range? | 850-1350 ohms | |||
5 |
Is the resistance within the specified range? | 850-1350 ohms | ||
6 |
Is the resistance less than the specified value? | 5 ohms | ||
7 | Repair CKT 884 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
8 |
Is the resistance less than the specified value? | 5 ohms | ||
9 | Repair CKT 885 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
10 | Malfunction is intermittent. Inspect all connectors and harnesses for damage that may result in an open or high resistance when connected. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
11 | Replace the wheel speed sensor. Refer to Wheel Speed Sensor Replacement . Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
Using the J 39200 DMM, measure the resistance between terminals 26 and B of the J 39700 . Is the resistance equal to the specified value? | OL (infinite) | |||
13 |
Is the resistance equal to the specified value? | OL (infinite) | ||
14 | Using the J 39200 DMM, measure the resistance between terminals 10 and B of the J 39700 . Is the resistance equal to the specified value? | OL (infinite) | ||
15 | Repair CKT 884 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
16 | Using the J 39200 DMM, measure the resistance between terminals 26 and B of the J 39700 . Is the resistance equal to the specified value? | OL (infinite) | ||
17 | Malfunction is intermittent. Inspect all connectors and harnesses for damage that may result in a short to ground when connected. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
18 | Repair CKT 885 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
Is the voltage greater than the specified value? | 1 V | |||
20 | Repair CKT 884 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
Using the J 39200 DMM, measure the voltage at terminal 26 of the J 39700 . Is the voltage greater than the specified value? | 1 V | |||
22 | Repair CKT 885 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
23 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
