Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Start the engine and allow it to reach normal operating temperature.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
  
  NOTE:
  Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.
  
  NOTE:
  If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope.
2. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2.
  No
  - Go To 8.
(K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage On (K29) App Sensor No. 2 Signal Circuit In App Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
3. Disconnect the APP Sensor harness connector.
4. Ignition on, engine not running.
5. Measure the voltage on the (K29) APP Sensor No. 2 Signal circuit in the APP Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (K29) APP Sensor No. 2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3.
(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT

Fig 2: Measuring Resistance Between (K29) App Sensor No. 2 Signal Circuit And (F856) 5-volt Supply Circuit In App Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. 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
  - Repair the short between the (K29) APP Sensor No. 2 Signal circuit and the (F856) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4.
(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 3: Measuring Resistance Between (K29) App Sensor No. 2 Signal Circuit And (F855) 5-volt Supply Circuit In App Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. 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
  - Repair the short between the (K29) APP Sensor No. 2 Signal circuit and the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5.
(K400) APP SENSOR NO. 2 RETURN CIRCUIT OPEN

Fig 4: Measuring Resistance Of (K400) App Sensor No. 2 Return Circuit From App Sensor Harness Connector To Appropriate Terminal Of Special Tool #8815
Courtesy of CHRYSLER LLC

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 the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
1. 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 (special tool #8815A, Kit, NGC, 38 Position).
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the open in the (K400) APP Sensor No. 2 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ACCELERATOR PEDAL POSITION SENSOR
1. Connect the PCM harness connectors.
2. Ignition on, engine not running.
3. With a scan tool, monitor the APP Sensor 2 voltage.
  Is the voltage above 0 volts?
  
  Yes
  - Go To 7.
  No
  - Verify that there is good pin to terminal contact in the APPS and the Powertrain Control Module connectors. Replace the APP Sensor Assembly per Service Information if no problems were found with the connectors. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APPS and the Powertrain Control Module connectors.
4. Refer to any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module per Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
APP SENSOR NO. 2 SWEEP
1. Ignition on, engine not running.
2. With a scan tool, monitor the APP Sensor 2 voltage.
3. 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
  - Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
  No
  - 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.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .