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
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
(K857) 5-VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the MAP Sensor connector.
3. Turn the ignition on.
4. Measure the voltage of the (K857) 5-Volt Supply circuit in the MAP Sensor harness connector.
  Is the voltage above 4.5 volts?
  
  Yes
  - Go to step 6
  No
  - Go to step 3
(K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 2: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (K857) 5-Volt Supply circuit in the MAP Sensor harness connector.
  Is the resistance above 1000 ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the (K857) 5-Volt Supply circuit for a short to ground.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT

Fig 3: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K857) 5-Volt Supply circuit and the (K900) Sensor Ground circuit in the MAP Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the (K857) 5-Volt Supply circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K857) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K857) 5-Volt Supply circuit between the MAP Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 10
  No
  - Repair the (K857) 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 .
(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 5: Checking MAP Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 7
  No
  - Repair the (K1) MAP Signal circuit for a short to ground.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K1) MAP SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT

Fig 6: Checking MAP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K1) MAP Signal circuit and the (K900) Sensor Ground circuit in the MAP Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (K1) MAP Signal circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K1) MAP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 7: Checking MAP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K1) MAP Signal circuit between the MAP Sensor harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the (K1) MAP Signal circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
MAP SENSOR

Fig 8: Checking MAP Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Connect the Powertrain Control Module (PCM) connector.
3. Connect a jumper wire between the (K857) 5-Volt Supply circuit and the (K1) MAP Signal circuit in the MAP Sensor harness connector.
4. Turn the ignition on.
5. With the scan tool, read the MAP Sensor signal voltage.
  Is the voltage above 4.5 volts with the jumper wire in place?
  
  Yes
  - Replace the MAP 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 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.
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 .