For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0899: Device Voltage LowDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0899 | C0899 | -- | -- |
Ground | -- | C0899 | -- | -- |
Circuit/System Description
The electronic brake control module (EBCM) monitors the system voltage level available for ABS operation. A low voltage condition prevents the ABS system from operating properly.
Conditions for Running the DTC
Ignition is ON.
Conditions for Setting the DTC
This fault will be set if the system voltage to EBCM is less than 9 volts for 100 msec.
Action Taken When the DTC Sets
| • | Antilock Brake System (ABS) and Traction Control System (TCS) are disabled for the duration of the ignition cycle. |
| • | The ABS and TCS indicators illuminates on the IPC. |
| • | The DIC displays the Service Stability System message, if equipped. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
- Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 volts.
- Observe the scan tool EBCM battery positive voltage parameter. The reading should be between 12.6 and 15.5 volts.
| ⇒ | If the battery voltage is not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition OFF, test for less than 3.0 ohms of resistance between the ground circuit terminals listed below and ground.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminals listed below and ground.
- If the circuits test normal, replace the EBCM.
| • | Terminal 16 |
| • | Terminal 45 |
| ⇒ | If greater than the specified range, test the ground circuits for an open/high resistance. |
| • | Terminal 2 |
| • | Terminal 31 |
| ⇒ | If the test lamp did not illuminate, test the B+ circuits for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup and programming.
