Diagnostic Test

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

ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
(F856) 5 VOLT SUPPLY CIRCUIT

Fig 1: Measuring Voltage On (F856) 5-volt Supply Circuit In MAP Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the MAP Sensor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (F856) 5 Volt Supply circuit in the MAP Sensor harness connector.
  Is the voltage between 4.5 to 5.2 Volts?
  
  Yes
  - Go To 3.
  No
  - Go To 7.
MAP SENSOR
1. With the scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.
  Is the voltage greater than 2.2 Volts?
  
  Yes
  - Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors. If OK, replace the MAP Sensor in accordance with the service information. Refer to SENSOR, Manifold Air Pressure (MAP) , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4.
(K1) MAP SIGNAL CIRCUIT OPEN

Fig 2: Measuring Resistance Of MAP Sensor Signal Circuit Between Harness Connector And Appropriate Terminal Of Special Tool #8815
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 the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
3. Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position).
  Is the resistance less than 5.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the open in the (K1) MAP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 3: Measuring Resistance Between Sensor Signal Circuit And Sensor Ground Circuit In MAP Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit in the MAP Sensor harness connector.
  Is the resistance less than 5.0 Ohms?
  
  Yes
  - Repair the short between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6.
(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 4: Measuring Resistance Between Ground And MAP Sensor Signal Circuit AT Harness Connector
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 less than 100 Ohms?
  
  Yes
  - Repair the short to ground in the (K1) MAP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 10.
(F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 5: Measuring Voltage On (F856) 5-volt Supply Circuit In MAP Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the C1 PCM harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (F856) 5 Volt Supply circuit in the MAP Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (F856) 5 Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8.
(F856) 5 VOLT SUPPLY CIRCUIT OPEN

Fig 6: Measuring Resistance Of 5-volt Supply Circuit From MAP Sensor Harness Connector To Appropriate Terminal Of Special Tool #8815
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
  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.
2. Measure the resistance of the (F856) 5 Volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position).
  Is the resistance less than 5.0 Ohms?
  
  Yes
  - Go To 9.
  No
  - Repair the open in the (F856) 5 Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 7: Measuring Resistance Between Ground And (F856) 5-volt Supply Circuit In MAP Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (F856) 5 Volt Supply circuit in the MAP Sensor harness connector.
  Is the resistance less than 100 Ohms?
  
  Yes
  - Repair the short to ground in the (F856) 5 Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 10.
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP 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 Sensor and Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any issues found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, Powertrain Control , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .