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CAB SYSTEM OVERVOLTAGE (CONTINUED) When Monitored and Set Condition • When Monitored: Ignition on. The Controller Antilock Brake (CAB) monitors the Fused B(+) circuit at all times • Set Condition: If the voltage is above 16 volts for greater than 500 milliseconds (ms), the Diagnostic Trouble POSSIBLE CAUSES SYSTEM VOLTAGE HIGH GROUND CIRCUIT OPEN CONTROLLER ANTILOCK BRAKE For a complete Brake Assist System (BAS) Circuit Diagram (Refer to 5 - BRAKES/ELECTRICAL - SCHEMATICS Diagnostic Test 1. WITH THE DRB III T , READ DTCs Turn the ignition on. With the DRB III T , erase DTCs. Turn the ignition off. Turn the ignition on. Start the engine. With the DRB III T , read DTCs. Does the DRB III T display a System Overvoltage DTC? Yes >> Go to 2 No >> The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible 2. MEASURE THE BATTERY VOLTAGE Start the engine. Raise engine speed above 1,800 RPM. Measure the battery voltage. Is the voltage above 16 volts? Yes >> Refer to the appropriate service information for charging system testing and repair. Perform ABS VERIFICATION TEST. No >> Go to 3 ZH BRAKES - ABS ELECTRICAL DIAGNOSTICS 5 - 197 |