Operation CHARM
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GMC Truck
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1988
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C 2500 Truck 2WD V8-350 5.7L
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Repair and Diagnosis
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Brakes and Traction Control
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Hydraulic System
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Hydraulic Assembly
Hydraulic Assembly
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Testing and Inspection
Code 2: Open Isolation Valve or ECU Malfunction
Code 3: Open Dump Valve or ECU Malfunction
Code 4: Grounded Anti-Lock Valve Switch
Code 5: Excessive Actuation of Dump Valve During Anti-Lock Stop
Code 7: Shorted Isolation Valve or Faulty ECU
Code 8: Shorted Dump Valve or Faulty ECU
Service and Repair
Four Wheel Anti-Lock Brake System
Rear Wheel Anti-Lock Brake System
