For 1990-2009 cars

### Circuit Description

The EBCM monitors the ignition positive voltage level available for ABS operation.

### Conditions for Running the DTC

The vehicle speed is greater than 3 km/h (2 mph).

### Conditions for Setting the DTC

Ignition Positive Voltage is less than 9.5 volts for 10 seconds.

### Action Taken When the DTC Sets

• | The ABS is disabled.

• | 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

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.

The following are possible causes of the malfunction:

• | Low battery voltage

• | An open or high resistance in the Ignition Positive Voltage circuit

• | An open or high resistance in the Motor or Solenoid Ground circuits

• | An internal EBCM malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step uses the scan tool to check the ignition positive voltage to the EBCM.

2. This step checks the ignition positive voltage circuit.

3. This step checks the module ground circuit.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Antilock Brake System Schematics
1 | Did you perform A Diagnostic System Check - ABS? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Ignition Voltage parameter in the ABS data list.

Does the scan tool indicate the ignition voltage is within the specified range?

Battery Voltage

Go to Diagnostic Aids

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the EBCM harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Measure the voltage between the ignition positive voltage circuit of the EBCM and a good ground.

Does the voltage measure within the specified range?

Battery Voltage

Go to Step 4

Go to Step 5

4 | Measure the voltage between the ignition positive voltage circuit and the module ground circuit of the EBCM. Does the voltage measure within the specified range? | Battery Voltage | Go to Step 9 | Go to Step 6
5 | Test the ignition positive voltage circuit of the EBCM for a high resistance, an open, or a short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8
6 | Test the motor and solenoid ground circuits of the EBCM for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 7
7 | Inspect for poor connections or corrosion at the ground G103. 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 11 | Go to Step 8
8 | Inspect for poor connections at the battery terminals. 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 11 | Go to Step 9
9 | Inspect for poor connections at the harness connector of 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 11 | Go to Step 10
10 | Replace the Brake Pressure Modulator Valve (BPMV). Refer to Brake Pressure Modulator Valve Assembly Replacement . Did you complete the replacement? | -- | Go to Step 11 | --
11 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK