Diagnostic Test

1) ACTIVE DTC
Ignition on, engine not running.

With a scan tool, select View DTCs.

Is the DTC Active at this time.

Yes
1. Go to 2).
No
1. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
2) (F856) 5-VOLT SUPPLY CIRCUIT

Fig 1: Checking MAP Sensor 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the MAP Sensor harness connector.

Ignition on, engine not running.

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
1. Go to 3).
No
1. Go to 7).
3) MAP SENSOR
With a scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.

Is the voltage above 2.2 volts?

Yes
1. Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. If OK, replace the MAP Sensor.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 4).
4) (K1) MAP SIGNAL CIRCUIT OPEN

Fig 2: Checking MAP Sensor Signal Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

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 Miller Special Tool #8815 to perform diagnosis.

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
1. Go to 5).
No
1. Repair the open in the (K1) MAP Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
5) (K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 3: Checking Manifold Absolute Pressure Sensor Signal Circuit & Ground Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Repair the short between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 6).
6) (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 4: Checking MAP Sensor Signal Circuit For Short To Ground
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (K1) MAP Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 10).
7) (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 5: Checking MAP Sensor 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the C1 PCM harness connector.

Ignition on, engine not running.

Measure the voltage on the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.

Is there any voltage present?

Yes
1. Repair the short to voltage in the (F856) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 8).
8) (F856) 5-VOLT SUPPLY CIRCUIT OPEN

Fig 6: Checking MAP Sensor 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC

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 Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (F856) 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
1. Go to 9).
No
1. Repair the open in the (F856) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
9) (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 7: Checking MAP Sensor 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (F856) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 10).
10) POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor and the Powertrain Control Module (PCM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors.

Refer to any Technical Service Bulletins that may apply.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .