For a complete wiring diagram Refer to Section 8W.When Monitored:Ignition on and battery voltage greater than 10 volts.Set Condition:Just after key on, the throttle is opened and closed to test the system. If the TP Sensor does not return to Limp Home Position at the end of this test, this DTC will set. One trip fault and the code will set within 5 seconds. ETC light is flashing.Possible CausesTHROTTLE PLATE STUCK ABOVE LIMP HOME POSITIONTP SENSOR NO.1 AND TP SENSOR NO.2 BOTH READ 2.5 VOLTS(K124) ETC MOTOR (+) CIRCUIT SHORTED TO BATTERY VOLTAGE(K124) ETC MOTOR (+) CIRCUIT OPEN(K126) ETC MOTOR (-) CIRCUIT OPEN(K124) ETC MOTOR (+) CIRCUIT SHORTED TO GROUND(K126) ETC MOTOR (-) CIRCUIT SHORTED TO GROUNDPCMAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).1. ACTIVE DTCMaximum engine speed could be reduced while this fault is active, it just depends where the throttle gets stuck.Ignition on, engine not running.The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets.With a scan tool select View DTCs.Diagnose any TP Sensor or 5-Volt Supply DTCs before continuing.Is the DTC Active at this time?YesGo To 2NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2. THROTTLE PLATE STUCK OPENTurn the ignition off.The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets.Remove the Air Cleaner Assembly from the Throttle Body.Check for any signs of a foreign material causing the Throttle to remain open.Using a scan tool actuate the ETC Motor.Does the Throttle Plate move?YesGo To 3NoRemove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the ETC RELEARN function.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)3. TP SENSOR NO.1 AND TP SENSOR NO.2 BOTH EQUAL 2.5 VOLTSWith a scan tool, perform the Throttle Follower test while reading both TP Sensor voltage readings.Are both TP Sensor readings stuck at 2.5 volts?YesCheck the TP Sensor Signal circuits for excessive resistance, being shorted to each other, or shorted to the Sensor Return circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44. (K124) ETC MOTOR (+) CIRCUIT SHORTED TO BATTERY VOLTAGE

Turn the ignition off.Disconnect the Throttle Body harness connector.Disconnect the C2 PCM harness connector.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 the diagnostics.Ignition on, engine not running.With a 12-volt test light connected to ground, probe the (K124) ETC Motor (+) circuit at the appropriate terminal of special tool #8815.Does the test light illuminate brightly?YesRepair the short to battery voltage on the (K124) ETC Motor (+) circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 55. (K124) ETC MOTOR (+) CIRCUIT OPEN

Turn the ignition off.Measure the resistance of the (K124) ETC Motor (+) circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 6NoRepair the open in the (K124) ETC Motor (+) circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)6. (K126) ETC MOTOR (-) CIRCUIT OPEN

Measure the resistance of the (K126) ETC Motor (-) 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 (K126) ETC Motor (-) circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7. (K124) ETC MOTOR (+) CIRCUIT SHORTED TO GROUND

Measure the resistance between a known good ground and the (K124) ETC Motor (+) circuit at the appropriate terminal of special tool #8815.Is the resistance below 100 ohms?YesRepair the short to ground in the (K124) ETC Motor (+) circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 88. (K126) ETC MOTOR (-) CIRCUIT SHORTED TO GROUND

Measure the resistance between a known good ground and the (K126) ETC Motor (-) circuit at the appropriate terminal of special tool #8815.Is the resistance below 100 ohms?YesRepair the short to ground in the (K126) ETC Motor (-) circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 99. PCMBefore 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)