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 front wheel speed sensor as needed. Refer to Wiring Repairs in Wiring Systems or Front Wheel Bearing and Hub Replacement in Front Suspension. Did you complete the repair? | -- | -- | |
Is the resistance within the specified? | 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 830 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 873 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 the 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 front wheel seed sensor. Refer to Front Wheel Bearing and Hub Replacement in Front Suspension. Did you complete the repair? | -- | -- | |
Use the J 39200 DMM in order to measure the resistance between terminal 24 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 8 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 830 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 24 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 873 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 830 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 24 of the J 39700 . Is the voltage above the specified value? | 1 V | Go to Step 22 | Go to Step 23 | |
22 | Repair CKT 873 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? | -- | -- |
