For 1990-2009 cars
ABS Components
Cell 44: Wheel Speed Sensors
Handling ESD Sensitive Parts Notice

### Circuit Description

The Electronic Brake Control Module (EBCM) receives left front wheel speed sensor voltage signal through terminal 17 and terminal 18. As a toothed reluctor wheel ring passes by the wheel speed sensor, changes in the electromagnetic field cause the wheel speed sensor to produce a small AC voltage. This voltage's frequency is proportional to the wheel speed.

### Conditions for Setting the DTC

• | DTC C0035 will set when the EBCM detects the following conditions:

- | An open

- | A short to voltage

- | A short to ground

• | DTC C0035 can be set anytime

### Action Taken When the DTC Sets

• | A malfunction DTC stores

• | The ABS disables

• | 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.

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. Tests the wheel speed sensor internal resistance for proper values.

2. Tests for wheel speed sensor circuits shorted together

3. Tests for a short to ground in the GRN wire.

4. Tests for a short to ground in the RED wire.

5. Tests for a short to voltage in the GRN wire.

6. Tests for a short to voltage in the RED wire.

7. Tests for an open or high resistance in the GRN wire.

8. Tests for an open or a high resistance in the RED wire.

9. Tests for poor connections at electrical connectors.

10. Determines whether the condition is intermittent and not due to a faulty EBCM.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Diagnostic System Check performed? |  | Go to Step 2 | Go to Diagnostic System Check - ABS
2 |

1. Remove the left front wheel.
2. Disconnect the left front wheel speed sensor electrical connector.
3. Use J 39200 DMM in order to measure the resistance between the left front wheel speed sensor connector terminals A and B (sensor side).

Is the resistance within the specified range?

1120-2520 ohms

Go to Step 3

Go to Step 12

3 |

1. Disconnect the Electronic Brake Control Module (EBCM) electrical connector.
2. Use J 39200 DMM in order to measure the resistance between the left front wheel speed sensor connector terminals A and B (harness side).

Is the resistance equal to the specified value?

OL

(Infinite)

Go to Step 4

Go to Step 13

4 | Use J 39200 DMM in order to measure the resistance between the left front wheel speed sensor connector terminal A (harness side) and ground. Is the resistance equal to the specified value? | OL (Infinite) | Go to Step 5 | Go to Step 14
5 | Use J 39200 DMM in order to measure the resistance between the left front wheel speed sensor connector terminal B (harness side) and ground. Is the resistance equal to the specified value? | OL (Infinite) | Go to Step 6 | Go to Step 15
6 |

1. Turn the ignition switch to the ON position.
2. Use J 39200 DMM in order to measure the voltage between the left front wheel speed sensor connector terminal A (harness side) and ground.

Is the voltage within the specified range?

0-1 V

Go to Step 7

Go to Step 16

7 | Use J 39200 DMM in order to measure the voltage between the left front wheel speed sensor connector terminal B (harness side) and ground. Is the voltage within the specified range? | 0-1 V | Go to Step 8 | Go to Step 17
8 | Use J 39200 DMM in order to measure the resistance between the left front wheel speed sensor connector terminal A (harness side) and the EBCM electrical connector terminal 17 (harness side). Is the resistance within the specified range? | 0-2 ohms | Go to Step 9 | Go to Step 18
9 | Use a J 39200 DMM in order to measure the resistance between the left front wheel speed sensor connector terminal B (harness side) and the EBCM electrical connector terminal 18 (harness side). Is the resistance within the specified range? | 0-2 ohms | Go to Step 10 | Go to Step 19
10 | Inspect the EBCM electrical connector and the left front wheel speed sensor connector for poor terminal contact, corrosion or damage. Repair as necessary. Is the action complete? | -- | Go to Step 11 | --
11 |

1. Turn the ignition switch to the LOCK position.
2. Reconnect the left front wheel speed sensor electrical connector.
3. Reconnect the EBCM electrical connector.
4. Turn the ignition switch to the ON position.
5. Connect a scan tool to the OBD2 Data Link Connector (DLC).
6. Select Diagnostic Trouble Codes (DTC) on scan tool.
7. Select DTC Information on scan tool.
8. Select Current DTC on scan tool.

Is DTC C0035 set as a Current DTC?

--

Go to Step 21

Go to Step 20

12 | Replace the left front wheel speed sensor. Refer to Front Wheel Speed Sensor Replacement . Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
13 | Repair the short between the RED and GRN wires. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
14 | Repair the short to ground in the GRN wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
15 | Repair the short to ground in the RED wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
16 | Repair the short to voltage in the GRN wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
17 | Repair the short to voltage in the RED wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
18 | Repair open or a high resistance in the GRN wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
19 | Repair open or a high resistance in the RED wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
20 | A malfunction is not present at this time. Refer to Diagnostic Aids for additional information regarding this DTC. Is the action complete? | -- | Go to Diagnostic System Check - ABS | --
21 | Test the electrical harness between the EBCM and the left front wheel speed sensor for the following conditions:

• | For possible short to ground

• | For short to voltage

• | For an open in the RED and/or GRN wires.

| Inspect the EBCM electrical connector for poor terminal contact. Repair the wiring as necessary. If the wiring is OK, replace the BPMV assembly. Refer to Brake Pressure Modulator Valve Assembly Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--