2012 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P0223-THROTTLE POSITION SENSOR 2 CIRCUIT HIGH

P0223-THROTTLE POSITION SENSOR 2 CIRCUIT HIGH

For a complete wiring diagram, refer to the Wiring Information.


Theory of operation

The Electronic Throttle Control (ETC) system uses two Throttle Position Sensors (TPS) to monitor the throttle blade position. The Throttle Position Sensors 1 and 2 are located within the Throttle Body assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides the processors with a signal voltage proportional to throttle blade movement. The processors share and monitor data to verify that the indicated TPS calculation is correct.


Possible Causes

(K122) TP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K122) TP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT
(K922) TP SENSOR RETURN CIRCUIT OPEN
THROTTLE POSITION SENSOR/THROTTLE BODY
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)



NOTE: When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode.

NOTE: If a 5-Volt supply DTC has also set, diagnose the 5 volt DTC before continuing.
1. Ignition on, engine not running.
2. With the scan tool, read the active DTCs.


Is the DTC Active at this time?

Yes


No


2. THROTTLE POSITION SENSOR

1. Turn the ignition off.
2. Disconnect the Throttle Body Assembly harness connector.
3. Ignition on, engine not running.
4. With the scan tool monitor the TP Sensor No.2 voltage.


Is the voltage below 0.5 Volt?

Yes


No


3. (K122) TP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (K122) TP Sensor No.2 Signal circuit at the Throttle Body harness connector.


Is there any voltage present?

Yes


No


4. (K122) TP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT
1. Measure the resistance between the (K122) TP Sensor No.2 Signal circuit and the (F855) 5-volt Supply circuit at the Throttle Body harness connector.


Is the resistance below 100 Ohms?

Yes


No


5. (K922) TP SENSOR RETURN CIRCUIT OPEN
1. Measure the resistance of the (K922) TP Sensor Return circuit from the Throttle Body harness connector to the PCM C2 harness connector.


Is the resistance below 5.0 Ohms?

Yes


No


6. POWERTRAIN CONTROL MODULE (PCM)

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body and Powertrain Control Module harness connectors.
4. Perform any Technical Service Bulletins that may apply.


Were there any problems found?

Yes


No


7. THROTTLE FOLLOWER TEST

1. Using the scan tool, perform the ETC Throttle Follower Test.
2. Monitor the TP Sensor No.2 voltage while slowly pressing the Throttle pedal down.


Is there a smooth voltage change from approximately 4.3 volts and decrease to approximately 0.7 volt?

Yes


No