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9. Reconnect the EBCM harness connector. 10. Ignition ON, test voltage of phase A phase B, and phase C. verify that the reading is battery positive voltage for each of the three phases. If not the specified value, test the phase A phase B, and phase C circuits for a short to 11. Ignition OFF, reconnect the SAS. Turn the ignition ON. Using the scan tool, rotate the steering wheel and observe the SAS. Verify the sensor sweeps through the entire range If not within the specified range or is erratic, replace the steering angle sensor. 12. If the sensor test normal, replace the EBCM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement Control Module References for EBCM replacement, setup, and programing DTC C0774 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 C0774 00 Low Tire Pressure System Performance Circuit Description The tire pressure monitor (TPM) system has 4 radio frequency (RF) transmitting pressure sensors
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
(VSES) will compensate for the low tire pressure with a calibration change to low tire present. Conditions for Running the DTC Vehicle speed is 32 km/h (20 mph), or greater for 1 minute. Conditions for Setting the DTC The TPM detects a tire pressure difference in 1 tire of 8.2 kPa (1.2 psi) higher or lower than The EBCM will receive a serial data message that a DTC C0774 has set. Actions Taken When the DTC Sets A DTC C0774 is stored in memory. The VSES system compensates for low tire pressure. Conditions for Clearing the DTC A current DTC will clear when the TPM system is reset. A history DTC will clear after 100 consecutive malfunction-free ignition cycles from when Diagnostic Aids A possible cause of this DTC could be a low tire pressure in one of the four tires. Scan Tool Reference Control Module References for Scan Tool Information Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. DTC C1100 OR C1101 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.
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DTC Descriptor DTC C1100 00 Brake Booster Vacuum Sensor Performance Diagnostic Fault Information Circuit/System Description The electronic brake control module (EBCM) provides a power 5-volt reference to the brake Conditions for Running the DTC The ignition is ON. Ignition voltage is greater than 9 volts. Conditions for Setting the DTC Voltage at the brake booster sensor signal output to the EBCM falls outside the 0.13-3.30 The power 5-volts reference is shorted to ground or battery positive. Action Taken When the DTC Sets One or more of the following actions may occur: The red BRAKE Warning indicator turns ON. Conditions for Clearing the DTC Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Brake Booster Vacuum 5-Volt C1100 C1100 C1100 - Signal Circuit C1100 C1100 C1100 - Low Reference Circuit - C1100 - -
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Reference Information Schematic Reference Antilock Brake System Schematics Connector End View Reference Component Connector End Views Description and Operation ABS Description and Operation (With JL4) or ABS Description and Operation (Without Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for Scan Tool Information Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor. 2. Test for less than 3.0 ohm of resistance between the low reference circuit terminal A and ground. If greater than 3.0 ohm, test the low reference circuit for an open/high resistance. If the 3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground. If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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