Service Points

OUTLINE





PCM Power Relay (Battery Power)
^ If the circuit is open, the engine will not start.
^ If the circuit is shorted, the EEC PWR fuse (30A) will burn out.





EEC PWR Fuse (PCM Memory Power)
^ If the EEC PWR fuse circuit has an open or short, Diagnostic Trouble Code No. P1605 is output.
^ If the circuit is open, the PCM memory function will not operate and Diagnostic Trouble Codes for intermittent malfunctions will not be indicated. Also, the learning control will be canceled. but will not produce any particular symptom.
^ If the circuit is shorted, the EEC PWR fuse (30A) will burn out.





Ground
^ If there is a poor ground, the engine may not start.

Malfunction Indicator Lamp (MIL) / Transmission Control Indicator Lamp (TCIL)
^ If the circuit is open, the MIL/TCIL will not illuminate with the ignition switch ON.
^ If the circuit is shorted, the MIL/TCIL will not go off after the engine is started.





Throttle Position (TP) Sensor
^ If the throttle position sensor or circuit has an open or short. Diagnostic Trouble Code No. P0121, P0122, P0123, P1120, P1121, P1124 or P1125 is output.
^ If the throttle position sensor circuit fails, rough idle, poor acceleration or shift shock (AT) may occur.





Camshaft Position (CMP) Sensor
^ If the camshaft position sensor or circuit has an open or short, Diagnostic Trouble Code No. P0340is output.
^ If the camshaft position sensor circuit fails, the engine will stall and will not restart.





Engine Coolant Temperature (ECT) Sensor
^ If the engine coolant temperature sensor or circuit has an open or short, Diagnostic Trouble Code No. P0117, P0118, P0125, P0126, P1116, or P1117 is output.
^ If the engine coolant temperature sensor circuit fails, no torque converter lockup will occur.





Brake On / Off (BOO) Switch
^ If the brake on/off switch or circuit has an open or short, Diagnostic Trouble Code No. P0703 or P1703 is output.
^ If the circuit is open, torque converter lockup will not disengage.
^ If the circuit is shorted. the stoplights will not operate and torque converter lockup will not occur.





Vehicle Speed Sensor (VSS)
^ If the vehicle speed sensor or circuit has an open or short, Diagnostic Trouble Code No. P0500 or P1500 is output.
^ If the vehicle speed sensor circuit fails, no 3-4,4-5,4-3 or 5-4 shifts or torque converter lockup will occur.

Transmission Range (TR) Sensor
^ If the vehicle is not in P or N range during diagnostic trouble code check, Diagnostic Trouble Code No. P1705is output.
^ If the TR sensor is misaligned or failed electrically, P1704is output.
^ If the TR sensor, circuit or PCM is shorted or grounded, P0705is output.
^ If the TR sensor circuit is above maximum voltage, P0708is output.

Evaporative Emission (EVAP) Canister Purge Solenoid
^ If the evaporative emission canister purge solenoid has an open or short circuit, Diagnostic Trouble Code No. P0443is output.
^ If the circuit is open, no symptom will be noticed.
^ If the circuit is shorted, the engine may stall at low speeds.
^ A short circuit may cause an improper air/fuel ratio, causing rough idle and hard starting.

Ignition Coil (#1 - #4)
^ If an ignition coil has an open or short circuit, Diagnostic Trouble Code No. P0301,P0302,P0303,P0304, P0305,P0306,P0350,P0351 or P0352is output.
^ If the circuit is open or shorted. a misfire condition may occur, causing hard starting and rough idle.





Purge Flow Sensor
^ If the purge flow sensor circuit has an open or short, Diagnostic Trouble Code No. P1444 or P1445is output.
^ If the purge flow sensor circuit is open or shorted. no symptom will be noticed.





Transmission Fluid Temperature (TFT) Sensor
^ If the transmission fluid temperature sensor circuit has an open or short. Diagnostic Trouble Code No. P0712,P0713, or P1711is output.
^ If the transmission fluid temperature sensor is open or shorted, erratic shifting may be felt.
^ If the transmission fluid exceeds 127:C(270-F), P1783 is output.





Turbine Shaft Speed (TSS) Sensor
^ If the turbine shaft speed sensor has an open or short, Diagnostic Trouble Code No. P0715 is output.
^ If the turbine shaft speed sensor circuit is open or shorted. no symptom will be noticed.











Shift Solenoids (SST, SS2, SS3, SS4)
^ If a shift solenoid or circuit has an open or short. Diagnostic Trouble Code No. P0731, P0732, P0733, P0734, P0750, P0751, P0755, P0756, P0760, P0761, P0765, P1751, P1756, or P1761 is output.
^ If one of these circuits fail, the transmission will shift into incorrect gears.





Electrical Pressure Control (EPC) Solenoid
^ If the electrical pressure control solenoid or circuit has an open or short, Diagnostic Trouble Code No. P1746 or P1747 is output.
^ If the electrical pressure control solenoid circuit fails, line pressure will default to maximum.





Coasting Clutch Solenoid (CCS)
^ If the coasting Clutch solenoid or circuit has an open or short, Diagnostic Trouble Code No. P1754 is output.
^ If the coasting clutch solenoid circuit fails, no engine braking will occur.





Torque Converter Clutch (TCC) Solenoid
^ If the torque converter clutch solenoid circuit fails, no torque converter lockup will occur.
^ If TCC slippage is detected, P0741 or P0744 is output
^ If TCC solenoid circuit fails during on-board diagnosis, P0743 is output.
^ If TCC malfunction is detected, P1 740 is output.