Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1996 >> Millenia V6-2255cc 2.3L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Troubleshooting Tips >> Input Devices -- Outline

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.0100 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 or will idle rough.
- If the ground terminal has an open circuit, Diagnostic Trouble Code No.P0120 is output.
- In the above conditions, the ECM 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 (A/C)
- If the thermosensor or circuit has an open or short, Diagnostic Trouble Code No.P0110 is output, and the ECM uses a preprogrammed intake air temperature of -10°C (14°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 circuit is open, rough idle or engine stalling may appear because of inoperative idle air 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, POi6O (left bank sensor) and/or PO134, PO14O (right bank sensor) is output.
- If the heated oxygen sensor signal remain unchanged for approximately 40 seconds in feedback zone, Diagnostic Trouble Codes No.PO15O (left bank sensor) and1or PO13O (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.

P/S 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 thermosensor or circuit has an open or short, Diagnostic Trouble Code No.P0115 output, and the ECM uses a preprogrammed temperature value of 52°C (125.6°F) and coolant fan and condenser fan operate continuously.
- 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.

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

High Air Charging Pressure Control Signal
- If the circuit is open, torque reduction control will not operate.
- If the circuit is shorted, always operates torque reduction control, causing poor acceleration or lack of power.

Vehicle Speed Sensor
- If the sensor or circuit has an open or short, diagnostic trouble code No.PO5OO is output.
- If the circuit is open or shorted, no symptom will be noticed.

Manifold Absolute Pressure Sensor
- If the sensor or circuit has an open or short circuit, diagnostic trouble code No.PO105 is output, and the ECM uses a preprogrammed manifold pressure of 101 kPa (760 mmHg).
- A malfunction in the MAP system may cause poor acceleration or lack of power.

Intake Air temperature Sensor (D/C)
- If the sensor or circuit has an open or short, diagnostic trouble code No.R1110 is output and the ECM uses a preprogrammed intake air temperature of 60°C (140°F)
- A malfunction in the intake air temperature sensor (D/C), no symptom will be noticed.

Intake Air Temperature Sensor (L/C)
- If the sensor or circuit has an open or short, diagnostic trouble code No.P1113 is output, and the ECM uses a preprogrammed intake air temperature of 60°C (140°F).
- A malfunction in the intake air temperature sensor (L/C), no symptom will be noticed.

Torque Reduction Request Signal (ABS/TCS Control Unit)
- 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, causing poor acceleration or lack of power.

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.

Rear Window Defroster Signal (A/C Amplifier)
- An open circuit can cause a low idle speed.
- An short circuit can cause a slightly high idle speed.

Headlight Switch
- An open circuit can cause a low idle speed.
- An short circuit can cause a slightly high idle speed.
pro multis · About Operation CHARM