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3. CHECK ACCELERATOR PEDAL MOVEMENT Turn the ignition off. Check the Accelerator Pedal for obstructions or other problem that could restrict pedal travel, cause binding or pro- Were any of these problems found? Yes >> Repair or replace as necessary. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go To 4 4. CHECK ACCELERATOR PEDAL POSITION SENSOR INPUT Turn the ignition on. NOTE: The Accelerator Pedal must be at the complete rest position for this test. Ensure the pedal is at rest Does the scan tool display below 2% for APP #1 and APP #2 percentages? Yes >> Go To 5 No >> Replace the Accelerator Pedal Position Sensor. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 5. INTERMITTENT APP SENSOR/BRAKE SWITCH Turn the ignition on. With the scan tool, read the APP #1 and APP #2 percentages Fully depress and release the Accelerator Pedal several times. With the scan tool, read the Primary and Secondary Brake Switch inputs. Fully depress and release the Brake Pedal several times. Were any problems found with the inputs during pedal actuation for the Brakes or Accelerator? Yes >> Repair or replace as necessary. No >> Using the wiring diagrams check the connectors and wiring associated with the Accelerator Pedal Sen- sor and Brake Switch for damage, corrosion or other problems that could cause an intermittent DTC. 9 - 1780 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |