Only DTC C1100 Set
1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor.
2. Wait for 60 seconds, test for less than 11 ohm between the low reference circuit terminal 2 and ground.
锟斤拷If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
3. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and ground.
锟斤拷If less than the specified range, test the 5 V reference circuit for an open/high resistance. If the circuit tests normal, replace the replace the
EBCM.
锟斤拷If greater than the specified range, test the 5 V reference circuit for a short to B+. If the circuit tests normal, replace the EBCM.
4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and the signal circuit terminal 1.
锟斤拷If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
锟斤拷If greater than the specified range, test the signal circuit for a short to B+. If the circuit tests normal, replace the EBCM.
5. Ignition OFF, disconnect the harness connector at the EBCM.
6. Test for infinite resistance between the signal circuit terminal 1 and ground.
锟斤拷If not the specified value, test the signal circuit for a short to ground.
7. If all circuits test normal, test or replace the brake booster vacuum sensor.
Both DTC C0710 and C1100 Set
1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor and the steering angle sensor.
2. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit terminals listed below and ground.
* Terminal 3 at the brake booster vacuum sensor
* Terminal 1 at the steering angle sensor
锟斤拷If less than the specified range, test both 5 V reference circuits for a short to ground. If the circuit tests normal, replace the EBCM.
锟斤拷If greater than the specified range, test both 5 V reference circuits for a short to voltage. If the circuits test normal, replace the EBCM.
3. If all circuits test normal, test or replace the brake booster vacuum sensor or steering angle sensor as required.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Power Brake Booster Vacuum Sensor Replacement (See: Brakes and Traction Control/Power Brake Assist/Brake Booster Vacuum
Sensor/Service and Repair)
* Steering Wheel Position Sensor Replacement (See: Sensors and Switches/Sensors and Switches - Steering and Suspension/Sensors and
Switches - Steering/Steering Angle Sensor/Service and Repair/Steering Wheel Position Sensor Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for EBCM replacement, setup, and programming
Gasoline Without LY6
DTC C0870, C1112, C1113, C1114, or C1119 (Gasoline Without LY6)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0870 00
- Device Voltage Reference Output 1 Circuit
DTC C1112 00
- Trailer Brake Control Relay Low Control Circuit
