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2. Ignition OFF, test for less than 1.0 ohm between the primary fuel level sensor low reference circuit terminal B and ground. If greater than the specified range, test the low reference circuit for an open/high 3. Ignition OFF, test for less than 1.0 ohm between the secondary fuel level sensor low reference circuit terminal B and ground. If greater than the specified range, test the low reference circuit for an open/high 4. Jumper the primary fuel level sensor signal circuit terminal C to secondary fuel level sensor signal circuit terminal C. Install a Signal Generator and Instrument Panel Tester between the 5. Ignition ON, vary the signal generator resistance between 40-250 ohms. Verify that the scan tool Fuel Tank Level Remaining parameter displays a range that varies between 5 and 95 If not within the specified range, test both signal circuits for an open/high resistance. If 6. Vary the signal generator resistance between 40-250 ohms. Verify that the fuel gage displays a range that varies between empty and full as the signal generator resistance If the gage is incorrect, replace the IPC. 7. If all circuits test normal, perform the fuel level sensor component test before replacing either the primary or secondary fuel level sensor. Component Testing 1. Ignition OFF, remove the primary and secondary fuel level senders. 2. While sweeping the primary fuel level sensor through its full range of motion, test for a minimum value less than 41 ohms and a maximum value greater than 119 ohms between the If not within the specified range, replace the primary fuel level sensor. 3. While sweeping the secondary fuel level sensor through its full range of motion, test for a minimum value less than 41 ohms and a maximum value greater than 119 ohms between the If not within the specified range, replace the secondary fuel level sensor. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fuel Level Sensor Replacement (Extended Cab w/26 Gal Tank) or Fuel Level Sensor Fuel Level Sensor Replacement (15 Reg Cab w/26 gal Tank) or Fuel Level Sensor Fuel Level Sensor Replacement (Cab/Chassis - Rear Tank) for the 6.6L engine Control Module References for the ECM or IPC replacement, setup, and programming HOURMETER INACCURATE OR INOPERATIVE 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. Circuit/System Description The instrument panel cluster (IPC) can display the accumulated engine run time hours when the Reference Information Schematic Reference Instrument Cluster Schematics Connector End View Reference Component Connector End Views Description and Operation Instrument Cluster Description and Operation
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Verification With the engine running, verify that the time on the hourmeter increments properly. If the time does not increment properly, replace the IPC. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Instrument Cluster Description and Operation Control Module References for IPC replacement, setup, and programming INSTRUMENT CLUSTER INOPERATIVE 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. Circuit/System Description Voltage is supplied to the instrument panel cluster (IPC) through the battery voltage circuit and Reference Information Schematic Reference
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Instrument Cluster Schematics Connector End View Reference Component Connector End Views Description and Operation Instrument Cluster Description and Operation 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 IPC. 2. Ignition ON, verify that a test lamp illuminates between the following appropriate RUN/CRANK relay voltage circuit and a ground. Terminal 2 Cadillac Terminal 5 Chevrolet/GMC If the test lamp does not illuminate, repair the RUN/CRANK voltage circuit for a short 3. Verify that a test lamp illuminates between the following appropriate RUN/CRANK relay voltage circuit and appropriate IPC ground circuit. Terminal 2 and 5 Cadillac Terminal 5 and 13 Chevrolet/GMC If the test lamp does not illuminate, repair the IPC ground circuit for an open/high 4. If all circuits test normal, replace the IPC. Repair Procedures
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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