Circuit Description
The wheel speed sensor generates an AC signal. The signal is produced when a toothed ring passes the wheel speed sensor. The frequency of the AC signal is proportional to the wheel speed. The EBCM uses the frequency of the signal in order to calculate the wheel speed.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
DTC C0035 will set when the EBCM detects the following conditions in the wheel speed sensor circuits:
| • | An open |
| • | A short to voltage |
| • | A short to ground |
Action Taken When the DTC Sets
| • | The EBCM disables the ABS |
| • | The ABS warning indicator turns ON |
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
Diagnostic Aids
Inspect the following list of items when diagnosing this part of the Antilock Brake System (ABS):
| • | Faulty electrical circuits (open and or high resistance, short to voltage, or short to ground) between the left front wheel speed sensor and the EBCM |
| • | Faulty left front wheel speed sensor (out of range resistance) |
An intermittent malfunction is most likely caused in the following cases:
| • | A poor connection rubbed through wire insulation |
| • | A wire that is broken inside the insulation |
Thoroughly examine any circuitry that is suspected of causing the intermittent complaint for the following conditions:
| • | Backed-out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal to wiring connections or physical damage to the wiring harness |
| Important: Wheel speed sensor resistance increases with an increase in sensor temperature. When measuring for a short to ground in a wheel speed sensor wiring circuit, manually switch the J 39200 (Digital Multimeter) to the Meg-Ohms range. This will ensure a high resistance short to ground can be found. See J 39200 owners manual. |
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems if an intermittent malfunction exists.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the wheel speed sensor for the proper resistance value.
-
This step ensures that the wheel speed sensor generates the proper voltage.
-
This step tests whether the wheel speed sensor circuits are shorted together.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform A Diagnostic System Check - ABS? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that this DTC set? | 8 km/h (5 mph) | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 |
Does the resistance measure within the specified range? | 1120-2520 ohms | Go to Step 4 | Go to Step 8 |
Does the AC voltage measure greater than the specified value? | 100 mV | Go to Step 5 | Go to Step 8 | |
Inspect for poor connections at the harness connector of the wheel speed sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 6 | |
6 | Test the wheel speed sensor circuits for the following:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7 |
Inspect for poor connections at the harness conector for the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 | |
8 | Replace the wheel speed sensor. Refer to Front Wheel Speed Sensor Replacement or Rear Wheel Speed Sensor Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Replace the Brake Modulator Assembly. Refer to Brake Pressure Modulator Valve Assembly Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
