Circuit Description
The wheel speed sensor used on this vehicle is a single point magnetic pickup. This sensor produces an AC signal. The EBCM/EBTCM uses the frequency of the AC signal to calculate the wheel speed.
Conditions for Setting the DTC
All of the following conditions occur:
| • | The ignition is ON. |
| • | The EBCM/EBTCM detects one of the following conditions: |
| - | An open |
| - | A short to ground |
| - | A short to voltage |
Action Taken When the DTC Sets
| • | A malfunction DTC is stored. |
| • | The ABS/TCS is disabled. |
| • | The ABS indicator isturned ON. |
| • | The TRACTION OFF indicator is turned ON. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and you used the scan tool Clear DTC function. |
| • | The EBCM/EBTCM does not detect the DTC in 50 drive cycles. |
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.
-
This step checks for an open in the wheel speed sensor (WSS) or WSS circuit.
-
This step checks for a short to ground in the WSS or WSS circuit.
-
This step checks for a short to voltage in the WSS circuit.
-
This step checks for a short to voltage in the WSS circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Is physical damage of sensor evident? | -- | Go to Step 3 | Go to Step 4 |
3 | Repair the LH rear wheel speed sensor as necessary. Refer to Wiring Repairs in Wiring Systems or Rear Wheel Speed Sensor Replacement . Did you complete the repair? | -- | -- | |
Is the resistance within the specified range? | 850-1350 ohms | Go to Step 12 | Go to Step 5 | |
5 |
Is the resistance within the specified range? | 850-1350 ohms | Go to Step 6 | Go to Step 11 |
6 |
Is the resistance less than the specified value? | 5 ohms | Go to Step 8 | Go to Step 7 |
7 | Repair CKT 884 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
8 |
Is the resistance less than the specified value? | 5 ohms | Go to Step 10 | Go to Step 9 |
9 | Repair CKT 885 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
10 | The malfunction is intermittent. Inspect all of the connectors and harnesses for damage that may result in an open or high resistance when connected. Refer to Intermittents and Poor Connections . Did you complete the repair? | -- | -- | |
11 | Replace the LH rear wheel speed sensor. Refer to Rear Wheel Speed Sensor Replacement . Did you complete the repair? | -- | -- | |
Use the J 39200 DMM in order to measure the resistance between terminal 26 and terminal B of the J 39700 . Does the resistance equal the specified value? | OL (infinite) | Go to Step 19 | Go to Step 13 | |
13 |
Does the resistance equal the specified value? | OL (infinite) | Go to Step 14 | Go to Step 11 |
14 | Use the J 39200 DMM in order to measure the resistance between terminal 10 and terminal B of the J 39700 . Does the resistance equal the specified value? | OL (infinite) | Go to Step 16 | Go to Step 15 |
15 | Repair CKT 884 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
16 | Use the J 39200 DMM in order to measure the resistance between terminal 26 and terminal B of the J 39700 . Does the resistance equal the specified value? | OL (infinite) | Go to Step 17 | Go to Step 18 |
17 | The malfunction is intermittent. Inspect all of the connectors and harnesses for damage that may result in a short to ground when connected. Refer to Intermittents and Poor Connections . Did you complete the repair? | -- | -- | |
18 | Repair CKT 885 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
Is the voltage above the specified value? | 1 V | Go to Step 20 | Go to Step 21 | |
20 | Repair CKT 884 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
Use the J 39200 DMM in order to measure the voltage at terminal 26 of the J 39700 . Is the voltage above the specified value? | 1 V | Go to Step 22 | Go to Step 23 | |
22 | Repair CKT 885 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
23 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | -- |
