No Response From Adjustable Pedal Module
NOTE:
After making any repairs, perform ADJUSTABLE PEDALS VERIFICATION TEST under VERIFICATION TESTS.
- Turn the ignition off. Disconnect the APM harness connector. See Fig 1. Using a 12-volt test light connected to ground, probe each Fused B+ circuit. If the test light is illuminated for each circuit, go to the next step. If the test light is not illuminated for each circuit, repair the Fused B+ circuit for an open or short.
- Turn the ignition off. Disconnect the APM harness connector. See Fig 1. Using a 12-volt test light connected to 12-volts, probe the ground circuit. If the test light illuminated, go to the next step. If the test light did not illuminate, repair the Ground circuit for an open.
- Disconnect the APM harness connector. See Fig 1. Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the Red and Black test probes. Connect the scope input cable to the channel one connector on the DRB. Attach the Red and Black leads and the cable to probe adapter to the scope input cable. With the DRBIII® select Pep Module Tools. Select lab scope. Select Live Data. Select 12 volt square wave. Press F2 for Scope. Press F2 and use the down arrow to set voltage range to 20 volts. Set Probe to x10. Press F2 again when complete. Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus circuit in the APM connector. Turn the ignition on. Observe the voltage display on the DRB Lab Scope. If the voltage pulses from 0 to approximately 7.5 volts, replace the Adjustable Pedal Module. See ADJUSTABLE PEDAL MODULE under REMOVAL & INSTALLATION. If the voltage does not pulse from 0 to approximately 7.5 volts, repair the PCI Bus circuit for an open.
NOTE:
Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If not, refer to the symptom list and repair as necessary. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table.