For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on. Battery voltage greater than 10 volts.Set Condition:Throttle Position Sensor No.1 voltage is greater than 4.8 volts for 25 ms. One Trip Fault. ETC light will illuminate.Possible Causes(K22) TP SIGNAL 1 CIRCUIT SHORTED TO BATTERY VOLTAGE(K22) TP SIGNAL 1 CIRCUIT OPEN(K22) TP SIGNAL 1 CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT(K922) TP RETURN CIRCUIT OPENTHROTTLE POSITION SENSOR/THROTTLE BODYTHROTTLE PLATE JAMMED AGAINST THE MAXIMUM STOPPCMAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).1. TP SENSOR NO.1 VOLTAGE ABOVE 4.8 VOLTSWhen this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode.Make sure the throttle is fully closed and free from binding or carbon build up.If a 5-Volt Supply DTC has also set, diagnose the 5-Volt DTC before continuing.If P2101 is also set, then make sure that the blade moves freely and does not hang up near Wide Open Throttle before trying to repair P0123.Start the engine.With a scan tool, read the TP Sensor No.1 voltage.Is the voltage above 4.8 volts?YesGo To 2NoGo To 82. THROTTLE POSITION SENSOR

Turn the ignition off.Disconnect the Throttle Body harness connector.Connect a jumper wire between the (K22) TP Signal 1 circuit and the (K922) TP Return circuit in the Throttle Body harness connector.With a scan tool, monitor the TP Sensor No.1 voltage.Ignition on, engine not running.Is the voltage below 0.5 of a volt with the jumper wire installed?YesDisconnect 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.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 3Remove the jumper wire before continuing.3. (K22) TP SIGNAL 1 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 (K22) TP Signal 1 circuit in the Throttle Body harness connector.Is the voltage above 0 volts?YesRepair the short to battery voltage in the (K22) TP Signal 1 circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44. (K22) TP SIGNAL 1 CIRCUIT OPEN

Turn the ignition off.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 (K22) TP Signal 1 circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 5NoRepair the open in the (K22) TP Signal 1 circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 5. (K22) TP SIGNAL 1 CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Measure the resistance between the (K22) TP Signal 1 circuit and the (F855) 5-volt Supply circuit in the Throttle Body harness connector.Is the resistance below 100 ohms?YesRepair the short between the (F855) 5-volt Supply circuit and the (K22) TP Signal 1 circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoGo To 66. (K922) TP RETURN CIRCUIT OPEN

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?YesGo To 7NoRepair the open in the (K922) TP Return circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 7. PCM 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?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoReplace and program the Powertrain Control Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 8. THROTTLE FOLLOWER TESTWith a scan tool, perform the Throttle Follower Test.Monitor the TP Sensor No.1 voltage.Does voltage start at approximately 0.3 of a volt and go above 4.7 volts with a smooth transition?YesRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoDisconnect 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.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)