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.
-
This step uses the scan tool to check the ignition positive voltage to the EBCM.
-
This step checks the ignition positive voltage circuit.
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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 | |
Does the scan tool indicate the ignition voltage is within the specified range? | Battery Voltage | Go to Diagnostic Aids | Go to Step 3 | |
Does the voltage measure within the specified range? | Battery Voltage | Go to Step 4 | Go to Step 5 | |
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 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
