Check the ABS Control module for the trouble code.
Code 7 = Throttle Position Sensor. Any fault with the TPS would cause erratic shifting.
CODE 7: THROTTLE ANGLE SENSOR
1. Turn ignition off. Remove HAZARD fuse at battery positive terminal for 10 seconds to reset ECU. Start engine. Verify if CHECK ENGINE and LED lights are on and if LED indicates Code 7. If light indicates Code 7, go to next step. If light does not indicate Code 7, problem is intermittent. Check for poor or loose connections at throttle angle sensor, connector C216 at right shock tower and connector C318 at left shock tower. Test drive, and check again.
2. If light is on, turn ignition off. Disconnect 3-wire connector from throttle angle sensor. Turn ignition on. Measure voltage between Yellow/White (positive) and Green (negative) wire terminals. If about 5 volts are not present, go to step 5). If voltage is about 5 volts, turn ignition off. Reconnect sensor connector. Connect ECU test harness between ECU and ECU connector.
3. Turn ignition on. Measure voltage between ECU terminals C7 (positive) and C12 (negative). See Fig. 1 . Voltage should read .3 volt at closed throttle and about 4.5 volts at wide open throttle. Transition between lower and upper voltage specifications as throttle is depressed should be smooth.
4. On A/T models, if sensor voltages are not correct, disconnect 18-pin connector from A/T control unit. Recheck voltages. If voltages are correct, replace A/T control unit. On all models, if voltages are not correct, replace throttle angle sensor or repair open or short in Red/Blue wire between ECU terminal C7, A/T control unit (if equipped) and throttle sensor.
5. If voltage reading between Yellow/White (positive) and Green (negative) wire terminals in step 2) was not about 5 volts, measure voltage between Yellow/White (positive) wire terminal and ground.
6. If about 5 volts are present, repair open in Green wire between ECU terminal C12 and throttle angle sensor. If about 5 volts are not present, turn ignition off. Connect ECU test harness between ECU and ECU connector. Turn ignition on.
7. Measure voltage between ECU terminals C13 (positive) and C12 (negative). If about 5 volts are present, repair open in Yellow/White wire terminal between ECU terminal C13 and throttle angle sensor. If about 5 volts are not present, substitute a known good ECU. If condition goes away, replace ECU.
Wednesday, September 29th, 2010 AT 9:44 AM