Checking the Accelerator Pedal Position Sensor Calibration
CHECKING THE ACCELERATOR PEDAL SENSOR CALIBRATIONPOSSIBLE CAUSES
- Mis-wired APPS
- Voltage not changing during sweep
- Throttle pedal not moving freely
- APPS
Diagnostic Test
1. MIS-WIRED APPS
Turn the ignition off.
Remove the APPS cover.
Inspect both APPS connector and ECM for proper wiring.
Q: Are both connectors wired correctly?
YES: Go To 2
NO: Repair miswired APPS connector at APPS or ECM.
Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
2. THROTTLE PEDAL NOT MOVING FREELY
Ignition on, engine not running.
Look for proper Throttle operation.
Q: Does the Throttle Pedal move freely between the upper and lower stops?
YES: Replace the APPS.
Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1