Input Devices -- Outline

[Input Device]
Mass Air Flow Sensor
- If the Vs terminal of the mass air flow sensor has a short circuit, diagnostic trouble code No.P01 00 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.P0120 is output.
- If the Vref terminal has a short circuit, the engine will not start.
- If the ground terminal has an open circuit, diagnostic trouble code No.P0120 is output.
- In the above conditions, the PCM uses a throttle valve fully-open program.
- If the throttle position sensor is not properly adjusted or the throttle position sensor system fails, poor acceleration or shift shock will result.

Intake Air Temperature Sensor
- If the temperature sensor or circuit has an open or short, diagnostic trouble code No.P0110 is output, and the PCM 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.

Closed Throttle Position Switch (In Throttle Position Sensor)
- If the position switch or circuit has on open or short, diagnostic trouble code No.P0510 is output.
- If the circuit is open, rough idle or engine stalling may appear because of inoperative AC control. If the circuit is shorted, fuel will be cut when the accelerator pedal is pressed, causing hunting.





Heated Oxygen Sensor
- If sensor signal lean for approximately 2 minutes in feedback zone, diagnostic trouble code No. PO154, P0160 (left bank sensor) and/or P0134, P0140 (right bank sensor) is output.
- If the heated oxygen sensor signal remain unchanged for approximately 40 seconds in feedback zone, diagnostic trouble codes No.P0150 (left bank sensor) and/or P0130 (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.P0335 is output.
- If the SGC signal circuit has an open or short, diagnostic trouble code No.P1345 is output.

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

Power Steering Pressure Switch
- An open circuit can cause a momentary drop in engine speed when steering at idle or low-speed driving.

NC Signal (NC Amplifier)
- 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 temperature sensor or circuit has an open or short, diagnostic trouble code No.P0115 is output, and the PCM uses a preprogrammed temperature value of 40°C (104°F).
- A malfunction in the engine coolant temperature sensor system may cause rough idle, engine stalling, or hard starting.

Blower Signal (NC Amplifier)
- If the circuit has an open, the idle speed may drop when in the high position.

Stoplight Signal
- An open or short circuit will produce no symptom.

Inhibitor Signal
- If the circuit is open, the idle speed will be slightly low in park/neutral position.
- If the circuit is shorted, the idle speed will be slightly high in P, D, S, and L ranges.

Torque Reduction Request Signal (ABS/TCS Control Unit)
- If the circuit is open or short, diagnostic trouble code No.P1627 is output.
- If a malfunction occurs in the torque reduction request signal, the traction control (TCS) is inhibited and TCS does not operate.

Knock Sensor
- If the knock sensor or circuit has an open or short, diagnostic trouble code No.P0325 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.P1402 is output.
- In the above conditions, the EGR valve will be fully closed.

EGR Boost Sensor
- If the EGR boost sensor or circuit has an open or short, diagnostic trouble code No.PO1O5 or P1195 is output.
- An open or short circuit will produce no symptom.

Vehicle Speed Sensor
- If the vehicle speed sensor or circuit has an open or short, diagnostic trouble code No.PO5OO is output.
- An open or short circuit will produce no symptom.

Headlight Switch
- An open or short circuit can cause a low idle speed when the switch is ON.
- A short circuit can cause a slightly high idle speed.