Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

1) ACTIVE DTC
NOTE: The most likely cause of this DTC is a vacuum leak.

NOTE: Diagnose any 5-Volt Supply, TP Sensor, Fuel System Lean or Rich, or MAP Sensor DTCs before continuing.

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

Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes
1. Go To 2).
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
2) VACUUM LEAK
NOTE: This code is enabled on engines with a plastic intake manifold and is intended to limit the maximum engine speed if a large crack occurs.

NOTE: A large vacuum leak is most likely the cause of this DTC.

Inspect the Intake Manifold and Throttle body for leaks and cracks.

Inspect the Power Brake Booster for any vacuum leaks.

Inspect the PCV system for proper operation or any vacuum leaks.

Inspect the MAP Sensor for proper installation.

Were any vacuum leaks found?

Yes
1. Repair the vacuum leak as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 3).
3) MAP SENSOR OPERATION
Start the engine.

With a scan tool, monitor the MAP Sensor voltage.

Snap the Accelerator pedal.

Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at Wide Open Throttle?

Yes
1. Go To 4).
No
1. Go To 11).
4) TP SENSOR OPERATION
Ignition on, engine not running.

With a scan tool, perform the Throttle Follower Test.

TP Sensor No.1 should start at approximately 0.8 of a volt and increase to 4.2 volts.

TP Sensor No.2 should start at approximately 4.2 volts and decrease to 0.8 of a volt.

Is the voltage transition smooth between the appropriate values?

Yes
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 5).
5) RESISTANCE IN (F855) 5-VOLT SUPPLY CIRCUIT

Fig 1: Checking Throttle Position Sensor 5-Volt Supply Circuit Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Throttle Body harness connector.

Disconnect the 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 (F855) 5-volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.

Is the resistance above 100 ohms?

Yes
1. Go To 6).
No
1. Repair the excessive resistance in the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
6) (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 2: Checking Throttle Position Sensor 5-Volt Supply Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and (F855) 5-volt Supply circuit at the appropriate terminal of the special tool #8815.

Is the resistance above 100 ohms?

Yes
1. Go To 7).
No
1. Repair the short to ground in the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
7) TP SENSOR

Fig 3: Checking TP Sensor No. 1 Voltage
Courtesy of DAIMLERCHRYSLER CORP.

Fig 4: Checking TP Sensor No. 2 Voltage
Courtesy of DAIMLERCHRYSLER CORP.

Connect the PCM harness connector.

Ignition on, engine not running.

With a scan tool, monitor the TP Sensor voltage.

Connect a jumper wire between the (K22) TP Sensor No.1 Signal circuit and the (K922) Sensor Return circuit in the Throttle Body harness connector.

TP Sensor No.1 voltage should start at approximately 4.8 volts and decrease to 0.2 of a volt.

Connect a jumper wire between the (K122) TP Sensor No.2 Signal circuit and the (F855) 5-volt Supply circuit in the Throttle Body harness connector.

TP Sensor No.2 voltage should start at approximately 0 volts and increase to 4.8 to 5.2 volts.

Does the TP Sensor voltage change to the appropriate voltage with the jumper wire installed?

Yes
1. Disconnect the Battery before replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 8).
8) RESISTANCE IN THE TP SENSOR SIGNAL CIRCUIT

Fig 5: Checking Throttle Position Sensor 1 Signal Circuit Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Fig 6: Checking Throttle Position Sensor 2 Signal Circuit Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the PCM harness connector.

Measure the resistance of the (K22) and (K122) TP Signal circuits from the Throttle Body harness connector to the appropriate terminals of special tool #8815.

Is the resistance below 5.0 ohms for each circuit?

Yes
1. Go To 9).
No
1. Repair the excessive resistance in the (K22) or (K122) TP Sensor Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
9) TP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Fig 7: Checking Throttle Position Sensor 1 Signal Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

Fig 8: Checking Throttle Position Sensor 2 Signal Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (K22) and (K122) TP Signal circuits at the appropriate terminal of the special tool #8815.

Is the resistance above 100 ohms for each circuit?

Yes
1. Go To 10).
No
1. Repair the short to ground in the (K22) or (K122) TP Sensor Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
10) RESISTANCE IN THE (K922) SENSOR RETURN CIRCUIT

Fig 9: Checking TP Sensor Return Circuit Open Or High Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the (K922) Sensor Return circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go To 17).
No
1. Repair the excessive resistance in the (K922) Sensor Return circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
11) RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT

Fig 10: Checking MAP Sensor 5-Volt Supply Circuit Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the MAP Sensor harness connector.

Disconnect the C1/A 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 (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 12).
No
1. Repair the excessive resistance in the (F856) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
12) (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 11: Checking MAP Sensor 5-Volt Supply Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

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

Is the resistance above 100k ohms?

Yes
1. Go To 13).
No
1. Repair the short to ground in the (F856) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
13) MAP SENSOR

Fig 12: Checking Manifold Absolute Pressure Sensor Signal Circuit & Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Connect the PCM harness connectors.

Ignition on, engine not running.

With a scan tool, monitor the MAP Sensor voltage.

Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit in the MAP Sensor harness connector.

Cycle the ignition switch from off to on.

With a scan tool, monitor the MAP Sensor voltage.

Does the scan tool display MAP voltage from approximately 4.9 volts to below 0.5 volt with the jumper wire installed?

Yes
1. Replace the MAP Sensor.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 14).
  NOTE: Remove the jumper wire before continuing.
14) RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT

Fig 13: Checking MAP Sensor Signal Circuit For Excessive Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the PCM harness connector.

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 15).
No
1. Repair the excessive resistance in the (K1) MAP Signal circuit
2. Perform POWERTRAIN VERIFICATION TEST .
15) (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 14: Checking MAP Sensor Signal Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

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

Is the resistance above 100k ohms?

Yes
1. Go To 16).
No
1. Repair the short to ground in the (K1) MAP Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
16) RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT

Fig 15: Checking Manifold Absolute Pressure Sensor Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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
1. Go To 17).
No
1. Repair the excessive resistance in the (K900) Sensor ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
17) PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

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
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 .