P0223-THROTTLE POSITION SENSOR 2 CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.



Possible Causes
(K122) TP SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE
(K122) TP SIGNAL 2 CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT
(K922) TP RETURN CIRCUIT OPEN
THROTTLE POSITION SENSOR/THROTTLE BODY
PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. ACTIVE 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.


Ignition on, engine not running.
With a scan tool, select View DTCs.

Is the DTC Active at this time?

Yes


No

2. THROTTLE POSITION SENSOR

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

Is the voltage below 0.5 volt?

Yes


No

3. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE



Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K122) TP Signal 2 circuit at the Throttle Body harness connector.

Is the voltage above 0 volts?

Yes


No

4. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT



Measure the resistance between the (K122) TP Signal 2 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 RETURN CIRCUIT OPEN


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

Is the resistance below 5.0 ohms?

Yes


No

6. 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


No

7. THROTTLE FOLLOWER TEST

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

Is there a smooth voltage change from high to low?

Yes


No