Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) APPS NO.2 VOLTAGE ABOVE 3.0 VOLTS
NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode.

Ignition on, engine not running.

With a scan tool, read the APP Sensor No.2 voltage.

NOTE: Diagnose any 5-Volt Supply DTCs before continuing.

Is the voltage above 3.0 volts?

Yes
1. Go To step 2).
No
1. Go To step 8).
2) ACCELERATOR PEDAL POSITION SENSOR
Turn the ignition off.

Disconnect the APPS harness connector.

Ignition on, engine not running.

With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.

Is the voltage above 0 volts?

Yes
1. Go To step 3).
No
1. Replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values.
2. Perform POWERTRAIN VERIFICATION TEST .
3) (K29) APP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 1: Checking Accelerator Pedal Position Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the C3 PCM harness connector.

Ignition on, engine not running.

Measure the voltage on the (K29) APP Sensor No.2 Signal circuit in the APP Sensor harness connector.

Is the voltage above 0 volts?

Yes
1. Repair the short to battery voltage in the (K29) APP Sensor No.2 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 4).
4) (K29) APPS NO.2 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT

Fig 2: Checking Accelerator Pedal Position Sensor Signal Circuit & 5-Volt Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance between the (K29) APP Sensor No.2 Signal circuit and the (F856) 5-volt Supply circuit in the APP Sensor harness connector.

Is the resistance below 10 ohms?

Yes
1. Repair the short between the (K29) APP Sensor No.2 Signal circuit and the (F856) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 5).
5) (K29) APPS NO.2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 3: Checking Accelerator Pedal Position Sensor Signal Circuit & 5-Volt Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between the (K29) APP Sensor No.2 Signal circuit and the (F855) 5-volt Supply circuit in the APP Sensor harness connector.

Is the resistance below 10 ohms?

Yes
1. Repair the short between the (K29) APP Sensor No.2 Signal circuit and the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 6).
6) (K400) APP SENSOR NO.2 RETURN CIRCUIT OPEN

Fig 4: Checking Accelerator Pedal Position Sensor Return Circuit
Courtesy of DAIMLERCHRYSLER CORP.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K400) APP Sensor No.2 Return circuit from the APP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go To step 7).
No
1. Repair the open in the (K400) APP Sensor No.2 Return circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
7) PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .
8) APP SENSOR NO.2 SWEEP
Ignition on, engine not running.

With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.

Slowly press the Accelerator Pedal down.

Does voltage start at approximately 0.22 of a volt and go above 2.31 volts with a smooth transition?

Yes
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values.
2. Perform POWERTRAIN VERIFICATION TEST .