Circuit Description
The Accelerator Pedal Position (APP) module provides a voltage signal that changes relative to the accelerator pedal position. There are three sensors which are located within the APP module that are scaled differently.
Conditions for Setting the DTC
| • | The PCM performs this DTC diagnostic continuously. |
| • | The reference voltage on the APP 2 sensor is less than 0.25 volt. |
| • | All of the diagnostic set conditions met for 2 seconds. |
Action Taken When the DTC Sets
| • | The input from APP 2 sensor is ignored. |
| • | This DTC will not turn on the Service Throttle Soon lamp by itself. |
| • | The throttle will operate normally as long as there is only one sensor malfunctio present. If two different APP sensors have a malfunction, the Service Throttle Soon lmap will light and the PCM will limit power. If three APP sensor have a malfunction present, the Service Throttle Soon lamp will light and the PCM will only allow the engine to operate the idle. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after forty consecutive warm-up cycles during which the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) of that same ignition cycle). |
| • | Use of a Scan tool. |
Diagnostic Aids
There are no driveability issues associated with the APP module unless a DTC is present. The most likely cause of this DTC are poor connections or the sensor itself. The least likely is a PCM problem.
A scan tool reads the APP 2 position in volts and should read about 4.5 volts with the throttle closed and the ignition ON or at idle. The voltage should decrease at a steady rate as the throttle is moved toward WOT. Also, 90% pedal travel is acceptable for a correct APP operation. Scan the APP 2 sensor while depressing the accelerator pedal with the engine stopped and the ignition ON. The display should vary from about 4.5 volts when the throttle was closed to about 1.5 volts when the throttle is held at the Wide Open Throttle (WOT) position.
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
-
This step determines if P0222 is the result of a hard failure or an intermittent condition.
-
This step checks the PCM and wiring.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing any DTCs, use the Scan Tool Capture Info to save freeze frame and failure records for reference, as the Scan Tool loses data when using the Clear Info function. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to A Powertrain On Board Diagnostic (OBD) System Check | |
Is the APP 2 voltage less than or equal to the specified value? | 0.25V | |||
The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If any additional DTCs were stored, refer to those tables first. Are there any additional DTCs stored? | -- | Go to the applicable DTC table | Go to Diagnostic Aids | |
4 |
Is the APP 2 voltage greater than the specified value? | 5 V | ||
5 | Use the J 39200 in order to probe the APP 2 sensor signal circuit at the APP sensor harness. Is the APP 2 voltage greater than the specified value? | 4.8 V | ||
6 |
Was the 5 volt reference circuit open or shorted to ground? | -- | ||
7 | Check the 5 volt reference circuit for a poor connection at the PCM and replace the terminal if necessary. Refer to Connector Repairs in Wiring Systems. Did the terminal require a replacement? | -- | ||
8 |
Was the APP 2 signal circuit open or shorted to ground? | -- | ||
9 | Check the APP 2 sensor signal circuit for a proper connection at the PCM and replace terminal if necessary. Refer to Connector Repairs in Wiring Systems. Did the terminal require replacement? | -- | ||
10 | Check for a proper electrical connection at the APP sensor. Was a repair performed? | -- | ||
11 | Replace the APP module. Refer to APP Module Replacement . Is the action complete? | -- | -- | |
12 | Replace the PCM. Important: The new PCM must be programmed. Refer to PCM Replacement/Programming . Is the action complete? | -- | -- | |
13 |
Does the Scan Tool indicate the diagnostic Passed? | -- | ||
14 | Does the Scan Tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC table | System OK |
