Step |
Action |
Values |
Yes |
No |
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views |
1 |
Did you perform the Diagnostic System Check - Vehicle? |
-- |
Go to Step 2 |
Go toDiagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
- Turn ON the ignition, with the engine OFF.
- Observe the accelerator pedal position (APP) sensor 1 voltage parameter with a scan tool.
Is the voltage less than the specified value? |
0.36 V |
Go to Step 5 |
Go to Step 3 |
3 |
- Observe the DTC information with a scan tool.
- Slowly depress the accelerator pedal to wide open throttle (WOT), then slowly return the accelerator pedal to the closed position.
- Repeat this action several times.
Did the DTC fail this ignition? |
-- |
Go to Step 13 |
Go to Step 4 |
4 |
- Observe the Freeze Frame/Failure Records for this DTC.
- Turn OFF the ignition for 30 seconds.
- Start the engine.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition? |
-- |
Go to Step 5 |
Go to Diagnostic Aids |
5 |
- Turn OFF the ignition.
- Disconnect the APP sensor harness connector. Refer to Accelerator Pedal with Position Sensor Replacement .
- Turn ON the ignition, with the engine OFF.
- Set up a DMM to test amperage on the 400 mA scale.
- Measure the amperage from the 5-volt reference circuit of APP sensor 1 to the low reference circuit of APP sensor 1, with a DMM.
Is the amperage more than the specified value? |
80 mA |
Go to Step 6 |
Go to Step 9 |
6 |
- Turn OFF the ignition.
- Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the APP sensor 1 and the signal circuit of the APP sensor 1.
- Turn ON the ignition, with the engine OFF.
- Observe the APP sensor 1 voltage parameter with a scan tool.
Is the voltage within the specified range? |
4.8-5.2 V |
Go to Step 7 |
Go to Step 10 |
7 |
- Turn OFF the ignition.
- Remove the engine control module (ECM)/transmission control module (TCM) fuse from the underhood fuse block.
Notice: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw.
- Measure the resistance from the low reference circuit of the APP sensor 1 to a good ground, with a DMM.
Is the resistance less than the specified value? |
10 ohms |
Go to Step 11 |
Go to Step 8 |
8 |
- Disconnect the ECM.
- Test the low reference circuit of the APP sensor 1 for an open or high resistance. Refer toCircuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition? |
-- |
Go to Step 15 |
Go to Step 12 |
9 |
Important: The 5-volt reference circuits are internally and externally connected at the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors.
- Test the 5-volt reference circuit of the APP sensor 1 for the following conditions:
- Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition? |
-- |
Go to Step 15 |
Go to Step 12 |
10 |
- Test the signal circuit of the APP sensor 1 for the following conditions:
- Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition? |
-- |
Go to Step 15 |
Go to Step 12 |
11 |
Test for an intermittent and for a poor connection at the APP assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition? |
-- |
Go to Step 15 |
Go to Step 13 |
12 |
Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition? |
-- |
Go to Step 15 |
Go to Step 14 |
13 |
Replace the APP assembly. Refer to Accelerator Pedal with Position Sensor Replacement .
Did you complete the replacement? |
-- |
Go to Step 15 |
-- |
14 |
Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement? |
-- |
Go to Step 15 |
-- |
15 |
- Clear the DTCs with a scan tool.
- Turn OFF the ignition for 30 seconds.
- Start the engine.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition? |
|