Diagnostic Test

1) ACTIVE DTC
NOTE: Diagnose and repair any Throttle Body circuit, system voltage, or sensor supply voltage DTCs before continuing with this test.

Start the engine and allow it to reach 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 can result in personal injury or death.

With the scan tool select View DTCs.

NOTE: If the DTC does not reset it may be necessary to test drive the vehicle.

NOTE: If the P2122-APP Sensor 1 Circuit Low DTC is also Active, diagnose the P2122 before continuing with the P0122 diagnostic procedure.

Is the DTC Active at this time?

Yes
1. Go to 2).
No
1. Go to 11).
2) P0222 ALSO SET
Was the P0222-TP SENSOR NO. 2 VOLTAGE LOW DTC set along with the P0122?

Yes
1. Go to 3).
No
1. Go to 4).
3) (F855) 5-VOLT SUPPLY CIRCUIT

Fig 1: Checking 5-Volt Supply Circuit At Throttle Body Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Throttle Body harness connector.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit in the Throttle Body harness connector.

Is the voltage between 4.8 to 5.2 volts?

Yes
1. Go to 4).
No
1. Go to 8).
4) THROTTLE POSITION SENSOR
With a scan tool, monitor the TP Sensor No. 1 voltage with the Sensor harness connector disconnected.

Is the voltage above 4.5 volts?

Yes
1. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 5).
5) (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 2: Measuring Resistance Between Ground And TP Sensor No. 1 Signal Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the C2 PCM harness connector.

Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit in the Throttle Body harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (K22) TP Sensor No. 1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 6).
6) (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K922) SENSOR RETURN CIRCUIT

Fig 3: Checking TP Sensor No. 1 Signal Circuit For Short To Sensor Return Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between the (K22) TP Sensor No. 1 Signal circuit and the (K922) Sensor Return circuit in the Throttle Body harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short between the (K922) Sensor Return circuit and the (K22) TP Sensor No. 1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 7).
7) EXCESSIVE RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT

Fig 4: Checking TP Sensor No. 1 Signal Circuit For Open Or Excessive Resistance
Courtesy of CHRYSLER LLC

Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit between the Throttle Body harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to 10).
No
1. Repair the excessive resistance in the (K22) TP Sensor No. 1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
8) (F855) 5-VOLT SUPPLY CIRCUIT OPEN

Fig 5: Measuring Resistance Of 5-Volt Supply 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 diagnostics.

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 below 5.0 ohms?

Yes
1. Go to 9).
No
1. Repair the open in the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
9) (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 6: Checking 5-Volt Supply Circuit For Short To Ground
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (F855) 5-volt Supply circuit in the Throttle Body harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 10).
10) 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 .
11) THROTTLE FOLLOWER TEST
With a scan tool, perform the Throttle Follower Test.

Monitor the TP Sensor No. 1 voltage.

Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth transition?

Yes
1. Refer to INTERMITTENT CONDITION .
No
1. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool select ETC RELEARN function.
2. Perform POWERTRAIN VERIFICATION TEST .