Engine Electrical - Hybrid (HP7)
DTC C0899
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
DTC Descriptor
DTC C0899 00
- Device Voltage Low - EBCM
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The electronic brake control module (EBCM) monitors the 12 V battery voltage level available for system operation. A low voltage condition prevents the system from operating properly.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
One of the following conditions exists for 0.5 seconds, or 5 seconds if the engine is cranking:
* The EBCM detects that the battery voltage is less than 9.7 V, and the vehicle speed is greater than 0 km/h.
* The EBCM detects that the battery voltage is less than 8.45 V, regardless of vehicle speed.
Action Taken When the DTC Sets
* The antilock brake system (ABS), traction control system (TCS), and vehicle stability enhancement system (VSES) are disabled.
* The electronic brake force distribution (EBD) is disabled, if the battery voltage is less than 8.45 V.
* The ABS, traction off, and vehicle dynamics caution (VDC) warning indicators turn ON.
* The BRAKE warning indicator turns ON, if the battery voltage is less than 8.45 V.
Conditions for Clearing the DTC
* The DTC will pass when the condition for setting the DTC is no longer present.
* The EBCM clears a history DTC when the DTC does not fail in 100 consecutive ignition 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 (Non 2 Mode Hybrid) (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
* ABS Description and Operation (Description and Operation)
* Charging System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage at the 12 V battery terminals. The voltage should be between 12.6 and 15.0 V.
• If not within the specified range, refer to Charging System Description and Operation (Description and Operation).
2. Observe the scan tool Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 30 seconds. Test for less than 5 Ohms between the ground circuit Terminal 16 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
* Terminal 1
* Terminal 32
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning)- for EBCM replacement, setup and programming.