Engine Electrical

DTC C0899

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of this diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0899 00
- Device Voltage Low - EBCM (JF3/JF7/JH6/JH7)

DTC C0899 03
- Device Voltage Low - EBCM (JL4), PTO (M1F)

Diagnostic Fault Information






Circuit/System Description

The electronic brake control module (EBCM) and the power take off module (PTOM), if equipped, monitor the battery positive (B+) voltage level available for system operation. A low voltage condition prevents the system from operating properly. If low voltage is detected by the EBCM or PTOM, then DTC C0899 sets.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The ignition voltage available to the EBCM or PTOM is less than 9 volts for 100 msec.

Action Taken When the DTC Sets

Electronic Brake Control Module (EBCM)
* The traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle.
* The vehicle dynamics caution (VDC) indicator turns ON.

Power Take-Off Module (PTOM)

The PTO (M1F) is disabled for the duration of the ignition cycle.

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.
* Inspect the ground connections G103 and G300 to insure that they are clean and tight.

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.

• If not within the specified range, refer to Charging System Test. Charging System Test

2. Observe the scan tool Battery Voltage Signal (EBCM) or Ignition 1 Signal (PTO) parameter in the data list of the module setting the DTC. The reading should be between 12.6 and 15.0 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the module that set the DTC.
2. Ignition OFF, test for less than 5 ohms between the ground circuit terminals listed below and ground.

* Terminal 1 (M1F PTO)
* Terminal 11 (JH6/JH7 EBCM)
* Terminal 28 (JF3/JF7 EBCM)
* Terminal 38 (JL4 EBCM)

• 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 (JH6/JH7 EBCM)
* Terminal 25 (JF3/JF7/JL4 EBCM)
* Terminal 32 (M1F PTO)

• 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 tests normal, replace the appropriate module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests