Input Devices

Volume Air flow Sensor (With Intake Air Temperature sensor)
^ If the intake air temperature sensor (within the volume airflow sensor) or circuit has an open or short, Diagnostic Trouble Code No.10 is output, and the ECM uses a preprogrammed intake air temperature of 20°C {68°F}.
^ If the intake air temperature sensor system fails, no particular symptom will be noticed.
^ If the Vs terminal of the air flow sensor has a short circuit, Diagnostic Trouble Code No.08 will be output, and the throttle position sensor and closed throttle position switch signal will be used to adjust the basic injection amount as to the following three modes.
1) Closed throttle position switch ON
2) Small throttle angle
3) Large throttle angle

Throttle Position Sensor
^ If the Vref terminal has an open circuit or the TVO terminal has an open or short circuit, Diagnostic Trouble Code No.12 is output.
^ If the 21 terminal has a short circuit, the engine will not start.
^ If the ground terminal has an open circuit, Diagnostic Trouble Code No.12 is output.
^ In the above conditions, the ECM uses a throttle valve wide open throttle program.
^ If the throttle position sensor is not properly adjusted or the throttle position sensor system fails, poor acceleration or shift shock (ATX) will result.

Closed Throttle Position Switch (In Throttle Position Sensor)
^ The switch monitor function of the Self-Diagnosis Checker can confirm the presence of an open or short circuit.
^ If the circuit is open, rough idle or engine stalling may appear because of inoperative idle speed control.
^ If the circuit is shorted, fuel will be cut when the accelerator pedal is pressed, causing hunting.

Heated Oxygen Sensor
^ If sensor output voltage is not generated because of an open or short circuit, Diagnostic Trouble Code No.15 (left bank sensor) and/or 23 (right bank sensor) is output.
^ If the heated oxygen sensor output voltage continues unchanged 20 sec. after the engine exceeds 1,500 rpm, Diagnostic Trouble Codes No.17 (left bank sensor) and/or 24 (right bank sensor) is output.
^ In the above conditions, no feedback control will be present and no symptom will be noticed.




Crankshaft Position Sensor (NE Signal), Camshaft Position Sensor (SGC Signal)
^ If the NE signal circuit has an open or short, Diagnostic Trouble Code No.02 is output.
^ If the SGC signal circuit has an open or short, Diagnostic Trouble Code No.03 is output.

Starter Signal
^ A lack of starter signal input will cause hard starting.

P/S Pressure Switch
^ An open or short circuit can cause a momentary drop in engine speed when steering at idle or low-speed driving.

Air Conditioning Switch
^ The switch monitor function can confirm the presence of an open or short circuit.
^ If the circuit is open, the air conditioner will not operate.
^ If the circuit is shorted, the air conditioner will constantly operate when the blower is ON.

Engine Coolant Temperature Sensor
^ If the engine coolant temperature sensor or circuit has an open or short, Diagnostic Trouble Code No.09 is output, and the ECM uses a preprogrammed temperature value of 80°C (176°F).
^ A malfunction in the engine coolant temperature sensor system may cause rough idle, engine stalling, or hard starting.

Blower Signal (A/C Amplifier)
^ The switch monitor function of the Self-Diagnosis Checker can confirm the presence of an open or short circuit.
^ If the circuit has an open or short, the idle speed may drop when in the 3rd or 4th position.

Brake Signal
^ The switch monitor function of the Self-Diagnosis Checker can confirm the presence of an open or short circuit.
^ An open or short circuit will produce no symptom.

Vehicle Speed Sensor
^ If the vehicle speed signal circuit has an open or short, Diagnostic Trouble Code No.06 is output.
^ If the circuit is open or shorted, hold mode will not operate.

Transaxle Range Position Signal (ATX)
^ If the circuit is open, the idle speed will be slightly low in P and N ranges.
^ If the circuit is shorted, the idle speed will be slightly high in R, D, S, and L ranges.

Reduce Torque Signal (ATX)
^ If a malfunction occurs in the reduce torque signal, the torque reduction control system is inhibited and line pressure will be high at shifting. Shift shock may be slightly increased.

Knock Sensor
^ If the knock sensor or circuit has an open or short, Diagnostic Trouble Code No.05 is output.
^ In the above conditions, ignition timing is retarded.

EGR Valve Position Sensor
^ If the EGR valve position sensor or circuit has an open or short, Diagnostic Trouble Code No.16 is output.
^ In the above conditions, the EGR control valve will be closed throttle position.

Neutral and Clutch Switches (MTX)
^ The switch monitor function of the Self-Diagnosis Checker can confirm the presence of an open or short circuit.
^ If the circuit is open, the idle speed will drop when A/C, P/S, or electrical load is ON.

Rear Window Defroster Switch
^ The switch monitor function of the Self-Diagnosis Checker can confirm the presence of an open or short circuit.
^ An open or short circuit can cause a low idle speed when the switch is ON.

Headlight Switch
^ The switch monitor function of the Self-Diagnosis Checker can confirm the presence of an open or short circuit.
^ An open or short circuit can cause a low idle speed when the switch is ON.

Daytime Running Lamp (Canada)
^ The switch monitor function of the Self-Diagnosis Checker can confirm the presence of an open or short circuit.
^ An open or short circuit can cause a low idle speed when the switch is ON.