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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. 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 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 4. If all circuits tests normal, replace the appropriate module. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for EBCM or PTOM replacement, setup and programming DTC C0900 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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