Diagnostic Test

WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.

DTC IS ACTIVE
NOTE: Diagnose and repair any APPS, system voltage, or sensor supply voltage DTCs before continuing with this test.
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.
2. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(F856) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: Checking 5-Volt Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Accelerator Pedal Position Sensor connector.
3. Disconnect the Powertrain Control Module (PCM) connector.
4. Measure the resistance of the (F856) 5-Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 3
  No
  - Repair the (F856) 5-Volt Supply circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K23) APP SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 2: Checking APP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K23) APP Signal 1 circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the (K23) APP Signal 1 circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K167) APP SENSOR GROUND 1 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Checking APP Ground Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K167) APP Sensor Ground 1 circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the (K167) APP Sensor Ground 1 circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K858) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Checking 5-Volt Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K858) 5-Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the (K858) 5-Volt Supply circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K29) APP SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 5: Checking APP Sensor Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K29) APP Signal 2 circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 7
  No
  - Repair the (K29) APP Signal 2 circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K400) APP SENSOR GROUND 2 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 6: Checking APP Sensor Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K400) APP Sensor Ground 2 circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (K400) APP Sensor Ground 2 circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
ACCELERATOR PEDAL POSITION SENSOR
1. Turn the ignition off.
2. Connect the Accelerator Pedal Position Sensor connector.
3. Connect the Powertrain Control Module (PCM) connector.
4. Turn the ignition on.
5. Set up a lab scope to view two graphs simultaneously.
6. Using one channel on the lab scope, backprobe the (K23) APP Signal 1 circuit at the APP Sensor harness connector.
7. Using the other channel on the lab scope, backprobe the (K29) APP Signal 2 circuit at the APP Sensor harness connector.
8. Slowly press and release the Accelerator Pedal while monitoring the lab scope screen.
  Does the scope pattern show any missing or erratic signals?
  
  Yes
  - Replace the Accelerator Pedal Position Sensor in accordance with the Service Information.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 9
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.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change or for the DTC to reset during the wiggle test.
6. Refer to any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .