Diagnostic Test

ACTIVE DTC
NOTE: Diagnose any TP Sensor or MAP Sensor component DTCs before continuing.

NOTE: If the P0501 - No Vehicle Speed Signal is set long with this DTC, refer to the P0501 diagnostics before continuing.

NOTE: The throttle plate and linkage should be free from binding and carbon build up.

NOTE: Make sure the throttle plate is at the idle position.
1. Ignition on, engine not running.
2. With a scan tool, read DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
VACUUM LEAK
NOTE: This code is enabled on engines with a plastic intake manifold and is intended to shut down the engine if a large crack occurs.

NOTE: A large vacuum leak is most likely the cause of this DTC.
1. Inspect the Intake Manifold for leaks and cracks.
2. Inspect the Power Brake Booster for any vacuum leaks.
3. Inspect the PCV system for proper operation and vacuum leaks.
4. Inspect the throttle plate to see if it is bent and will close entirely, if it is bent it may need to be replaced.
5. Inspect the MAP Sensor for proper installation.
6. Verify the engine is free from any mechanical failures.
  Were any vacuum leaks found?
  
  Yes
  - Repair the vacuum leak as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
MAP SENSOR OPERATION
1. Start the engine.
2. With a scan tool, monitor the MAP Sensor voltage.
3. Snap the throttle.
  Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at wide open throttle?
  
  Yes
  - Go to step 4
  No
  - Go to step 11
TP SENSOR OPERATION
1. Ignition on, engine not running.
2. With a scan tool, monitor the TP Sensor voltage while slowly pressing the throttle pedal from closed to wide open throttle.
  Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth transition?
  
  Yes
  - Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 5
EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 1: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the TP Sensor harness connector.
3. Disconnect the C2 PCM harness connector.
  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 PCM Pinout Box 8815 to perform diagnosis.
4. Measure the resistance of the (F855) 5-volt Supply circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the excessive resistance in the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 2: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and (F855) 5-volt Supply circuit in the TP Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7
THROTTLE POSITION SENSOR

Fig 3: Checking TP Sensor Circuit
Courtesy of CHRYSLER LLC
1. Connect the C2 PCM harness connector.
2. Ignition on, engine not running.
3. With a scan tool, monitor the TP Sensor voltage.
4. Connect a jumper wire between the (K22) TP Sensor No. 1 Signal circuit and the (K900) Sensor ground circuit in the Sensor harness connector.
  Does the TP Sensor voltage change from approximately 4.9 volts to below 0.5 of a volt with the jumper wire installed?
  
  Yes
  - Replace the Throttle Position Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 8
    NOTE: Remove the jumper wire before continuing.
EXCESSIVE RESISTANCE IN THE (K22) TP NO. 1 SIGNAL CIRCUIT

Fig 4: Checking TP Sensor Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the C2 PCM harness connector.
  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 PCM Pinout Box 8815 to perform diagnosis.
3. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the excessive resistance in the (K22) TP Sensor No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 5: Checking TP Sensor Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit in the TP Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (K22) TP Sensor No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 10
EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT

Fig 6: Checking TP Sensor Circuit
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 PCM Pinout Box 8815 to perform diagnosis.
1. Measure the resistance of the (K900) Sensor ground circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 17
  No
  - Repair the excessive resistance in the (K900) Sensor ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 7: Checking TP Sensor Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the MAP Sensor harness connector.
3. Disconnect the C2 PCM harness connector.
  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 PCM Pinout Box 8815 to perform diagnosis.
4. Measure the resistance of the (F855) 5-volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 12
  No
  - Repair the excessive resistance in the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 8: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (F855) 5-volt Supply circuit in the MAP Sensor harness connector.
  Is the resistance above 100k ohms?
  
  Yes
  - Go to step 13
  No
  - Repair the short to ground in the (F856) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
MAP SENSOR

Fig 9: Checking MAP Sensor Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Connect the C2 PCM harness connector.
3. Ignition on, engine not running.
4. With a scan tool, monitor the MAP Sensor voltage.
5. Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit.
  Does the scan tool display MAP voltage from approximately 4.9 volts to below 0.5 of a volt with the jumper wire installed?
  
  Yes
  - Replace the MAP Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 14
    NOTE: Remove the jumper wire before continuing.
EXCESSIVE RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT

Fig 10: Checking MAP Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the C2 PCM harness connector.
  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 PCM Pinout Box 8815 to perform diagnosis.
3. Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 15
  No
  - Repair the excessive resistance in the (K1) MAP Signal circuit
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 11: Checking MAP Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (K1) MAP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 16
EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT

Fig 12: Checking MAP Sensor Ground Circuit
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 PCM Pinout Box 8815 to perform diagnosis.
1. Measure the resistance of the (K900) Sensor ground circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 17
  No
  - Repair the excessive resistance in the (K900) Sensor ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
1. 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
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module per Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .