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P2111-ELECTRONIC THROTTLE CONTROL - UNABLE TO CLOSE (CONTINUED) 2. THROTTLE PLATE STUCK OPEN Turn the ignition off. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. 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? Yes >> Go To 3 No >> Remove 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 com- 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 VOLTS With 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? Yes >> Check 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) No >> Go To 4 4. (K447) ETC POSITIVE CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing With a 12-volt test light connected to ground, probe the (K447) ETC Does the test light illuminate brightly? Yes >> Repair the short to battery voltage on the (K447) ETC Positive circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 5 9 - 854 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |