GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Park Avenue 🢒 DTC 🢒 DTC C1232 LF Wheel Speed Circuit Open or Shorted

Object Number: 397521 Size: MF
ABS Components
Cell 44: Wheel Speed Sensors and Variable Steering Actuator
Handling ESD Sensitive Parts Notice

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.

  1. This step tests for an open in the wheel speed sensor (WSS) or in the WSS circuit.

    2.

  2. This step tests for a short to ground in the WSS or the WSS circuit.

    3.

  3. This step tests for a short to voltage in the WSS circuit.

    4.

  4. This step tests for a short to voltage in the WSS circuit.

Step

Action

Value(s)

Yes

No

1

Was the ABS Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2
  1. Inspect the WSS wiring and the connectors for damage.
  2. Inspect the WSS for looseness or damage.

Is physical damage of the sensor or wiring evident?

--

Go to Step 3

Go to Step 4

3

Repair as needed. Refer to Wiring Repairs in Wiring Systems or Front Wheel Bearing and Hub Replacement in Front Suspension.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

4

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the EBCM/EBTCM.
  3. Install the J 39700 universal pinout box using the J 39700-25 cable adapter to the EBCM/EBTCM harness connector only.
  4. Using the J 39200 digital multimeter (DMM), measure the resistance between terminal 15 and terminal 31 of J 39700 .

Is the resistance within the specified range?

850-1350 ohms

Go to Step 12

Go to Step 5

5
  1. Disconnect the LH front wheel speed sensor.
  2. Using the J 39200 DMM, measure the resistance between terminal A and terminal B of the wheel speed sensor connector.

Is the resistance within the specified range?

850-1350 ohms

Go to Step 6

Go to Step 11

6
  1. Connect a jumper between the LH front wheel speed sensor harness connector terminal B and ground.
  2. Using the J 39200 DMM, measure the resistance between terminal 31 and terminal B of the J 39700 .

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.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

8
  1. Connect a jumper between the LH front wheel speed sensor harness connector terminal A and ground.
  2. Using the J 39200 DMM, measure the resistance between terminal 15 and terminal B of the J 39700 .

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.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

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 - ABS

--

11

Replace the LH front wheel speed sensor. Refer to Front Wheel Bearing and Hub Replacement in Front Suspension.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

12

Using the J 39200 DMM, measure the resistance between terminal 15 and terminal B of the J 39700 .

Is the resistance equal to the specified value?

OL (Infinite)

Go to Step 19

Go to Step 13

13
  1. Disconnect the LH front wheel speed sensor.
  2. Using the J 39200 DMM, measure the resistance between terminal A and ground of the wheel speed sensor connector.

Is the resistance equal to the specified value?

OL (Infinite)

Go to Step 14

Go to Step 11

14

Using the J 39200 DMM, measure the resistance between terminal 31 and terminal B of J 39700 .

Is the resistance equal to 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.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

16

Using the J 39200 DMM, measure the resistance between terminal 15 and terminal B of the J 39700 .

Is the resistance equal to the specified value?

OL (Infinite)

Go to Step 17

Go to Step 18

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 - ABS

--

18

Repair CKT 873 for a short to ground. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

19

  1. Disconnect the LH front wheel speed sensor.
  2. Turn the ignition switch to the RUN position, with the engine OFF.
  3. Using the J 39200 DMM, measure the voltage from terminal 31 to terminal B of the J 39700 .

Is the voltage greater than 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.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

21

Using the J 39200 DMM, measure the voltage from terminal 15 to terminal B of the J 39700 .

Is the voltage greater than 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.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

23

Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--