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2. APP SENSOR WIDE OPEN THROTTLE VOLTAGE Turn the ignition on. Fully depress the accelerator pedal. Using a voltmeter backprobe the APP Sensor harness connector and Is the voltage between 4.45 and 4.75 volts for #1 and 2.15 and Yes >> Go To 3 No >> Go To 4 3. VERIFY APP SENSOR OPERATION Turn the ignition on. With the scan tool, read the APP Sensor 1 and APP Sensor 2 percentages (%). With the accelerator pedal in the idle position, slowly depress the accelerator pedal until the pedal is fully NOTE: The percentage readings for APP Sensors 1 and 2 should increase smoothly as the pedal is NOTE: This test can also performed using a voltmeter by back probing each APP Sensor Signal circuit at Does the percentage (voltage) increase smoothly for both readings with the accelerator pedal travel? Yes >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace the Accelerator Pedal Position Sensor in accordance with the Service Information. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 4. VERIFY 5-VOLT SUPPLY AND SENSOR REFERENCE VOLTAGE A CIRCUITS NOTE: Perform the rest of this diagnostic procedure on the indi- Disconnect the APP Sensor harness connector. Turn the ignition on. Measure the voltage of the 5-Volt Supply circuit in the APP Sensor har- Is the voltage between 4.7 and 5.3 volts? Yes >> Go To 5 No >> Go To 13 9 - 1346 ENGINE DIESEL DIAG KJ |