Toyota Inputs & Sensors
Toyota Inputs & Sensors
Toyota Inputs & Sensors
MAF Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MAP Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IAT Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ECT Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Throttle Position Sensor . . . . . . . . . . . . . . . . . . . Knock Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . Camshaft Position Sensor . . . . . . . . . . . . . . . . . Crankshaft Position Sensor . . . . . . . . . . . . . . . . Vehicle Speed Sensor . . . . . . . . . . . . . . . . . . . . . ECM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ce1 Ce3 Ce6 Ce8 Ce13 Ce15 Ce17 Ce19 Ce20 Ce21
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MAF Sensor
Mass Airflow (MAF) Sensor
MONITOR DESCRIPTION
The MAF sensor monitors the amount of air flowing through the throttle valve. The engine control module (ECM) uses this information to determine the fuel injection time and provide a proper air/fuel ratio. Inside the MAF sensor, there is a heated platinum wire exposed to the flow of intake air. By applying a specific current to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire and an internal thermistor, changing their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the MAF sensor. The voltage level is proportional to the airflow through the sensor and the ECM interprets this voltage as the intake air amount. If there is a defect in the sensor or an open or short circuit, the voltage level will deviate outside the normal operating range. The ECM interprets this deviation as a defect in the MAF sensor and sets a DTC.
MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation ti Sequence of operation Continuous Within 10 sec. Immediate 2 driving cycles None Engine RPM is less than 4,000 rpm Engine RPM is 4,000 rpm or more P0100 Main Sub MAF sensor is open/shorted MAF sensor Crankshaft position sensor
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MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. 2 driving cycles None P0101 Main Sub MAF sensor malfunction MAF sensor Crankshaft position sensor, Throttle position sensor and ECT sensor
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MAP Sensor
Manifold Air Pressure (MAP) Sensor
MONITOR DESCRIPTION
Sensor Specification
Volt (V) (3.96) Output Voltage 3.6 2.4 1.2 150 20 450 60 750 100 840 mmHg (112) kPa
The MAP sensor detects the air pressure in the intake manifold. The ECM uses this sensor to calculate the engine load. Engine load is one of the factors the ECM uses to determine the fuel injector ON time, i.e. the fuel injection quantity. The sensor always indicates a pressure in the intake manifold as a complete vacuum is interpreted as zero pressure. Manifold pressures vary from a low values during idle or deceleration conditions to atmospheric pressure at wideopen throttle. Supercharged or turbocharged engines will achieve pressure above atmospheric pressure. The ECM supplies a regulated 5 V referencevoltage to the MAP sensor. The MAP sensor varies its outputs signal voltage between 1.2 V and 3.96 V in response to the pressure variations in the intake manifold. When the pressure in the intake manifold is low, the output voltage of the MAP sensor is low. When the pressure is high, the output voltage is high. If the ECM detects a MAP sensor output voltage that is out of the specified range, the ECM interprets this as a malfunction in the MAP sensor and sets a DTC.
MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. Immediate None P0105 Main Sub MAP sensor circuit is open/shorted MAP sensor None
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The MAP sensor detects the air pressure (vacuum) in the intake manifold. The ECM uses this sensor to calculate the engine load. Engine load is one of the factors the ECM uses to determine the fuel injector ON time, i.e. the fuel injection quantity. The sensor always indicates a pressure in the intake manifold as a complete vacuum is interpreted as zero pressure. Manifold pressures vary from a low value during idle or a deceleration condition to higher value at wideopen throttle (atmospheric pressure level). Supercharged or turbocharged engines will achieve pressure above atmospheric pressures. The ECM supplies a regulated 5V referencevoltage to the MAP sensor. The MAP sensor varies its outputs signal voltage between 1.2 V and 3.96 V in response to the pressure variations in the intake manifold. When the pressure in the intake manifold is low, the output voltage of the MAP sensor is low. When the pressure is high, the output voltage is high. To confirm that the output voltage of the MAP sensor corresponds to the actual pressure in the intake manifold, the ECM checks the MAP sensor output voltage in the following conditions: While idling (low intake manifold pressure) S While the engine is in a highload condition (high intake S manifold pressure) If the ECM detects a high output voltage from the MAP sensor while the engine is idling or a low output voltage when the engine is highly loaded, the ECM interprets this as a malfunction in the MAP sensor and sets a DTC.
MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. 2 driving cycles None P0106 Main Sub MAP sensor malfunction MAP sensor Crankshaft position sensor, Throttle position sensor and ECT sensor
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IAT Sensor
Intake Air Temperature (IAT) Sensor
MONITOR DESCRIPTION
Sensor Specification
30 20
10
Acceptable
The IAT sensor mounted on the mass airflow (MAF) sensor*, monitors temperature of the intake air. The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected in the voltage output from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the IAT sensor and sets a DTC. * When the engine uses a manifold air pressure (MAP) sensor instead of a MAF sensor, the IAT sensor is mounted on the air cleaner box.
Resistance k
Temperature C (F)
A15475
MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. Immediate None P0110 Main Sub IAT sensor circuit is open/shorted IAT sensor None
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ECT Sensor
Engine Coolant Temperature (ECT) Sensor
MONITOR DESCRIPTION
Sensor Specification
30 20
Resistance k
10
Acceptable
The ECT sensor is used to monitor temperature of engine coolant. The ECT sensor has a thermistor that varies its resistance depending on the temperature of the engine coolant. When the temperature is low the resistance in the thermistor increases. When the temperature is high the resistance drops. The variations in resistance are reflected in the voltage output from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. If the ECM detects that the resistance of the ECT sensor is out of the normal range, the ECM interprets this as a malfunction in the ECT sensor and sets a DTC.
Temp. C (F)
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MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. Immediate None P0115 Main Sub ECT sensor circuit is open/short ECT sensor None
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30 20
10
Acceptable
Temperature C (F)
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The ECT sensor is used to monitor temperature of engine coolant. The ECT sensor has a thermistor that varies its resistance depending on the temperature of the engine coolant. When the temperature is low the resistance in the thermistor increases. When the temperature is high the resistance drops. The variations in resistance are reflected in the voltage output from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. When the sensor output voltage is outside the normal opS erating range, the ECM interprets this as a malfunction of the ECT sensor and a DTC is set. If the ECT is too low to permit Closed Loop operation S even through enough time has elapsed for the engine to partially warm up, the ECM interprets this as a malfunction of the ECT sensor or cooling system and a DTC is set. If the ECT output does not vary even though the vehicle S is repeatedly accelerated and slowed, the ECM interprets this as a malfunction of the ECT sensor or cooling system and a DTC is set.
MONITOR STRATEGY
Related DTCs P0116 Main Required sensors/Components Frequency of operation Duration D ti Sub Once per driving cycle 250 sec. or more Within 1,200 sec. 6 driving cycles 2 driving cycles None ECT sensor malfunction Insufficient ECT for Closed Loop ECT sensor malfunction when ECT is fixed at 60C (140F) or more Others S ECT sensor malfunction S Insufficient ECT for Closed Loop ECT sensor IAT sensor, MAF sensor (or MAP sensor), Radiator fan, Thermostat and Vehicle speed sensor
Resistance k
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Case 11: ECT sensor malfunction (ECT is fixed at less than 60C/140F) ECT at engine start IAT at engine start Vehicle speed change by 30 km/h (19 mph) or more 35C (95F) 6.7C (20F) 10 times 60C (140F)
Case 12: ECT sensor malfunction (ECT is fixed at 60C/140F or more) ECT at engine start IAT at engine start Stop and Go* condition (refer to the following chart) Steady Run and Stop* condition (refer to the following chart) Case 2: Insufficient ECT for Closed Loop Throttle valve Intake air amount Fuel cut Open (idle OFF) 0.1 g/sec. Not operating 60C (140F) 6.7C (20F) Once Once 104.4C (220F)
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Case 12: ECT sensor malfunction (ECT is fixed at 60C/140F or more) Change value of ECT Case 2: Insufficient ECT for Closed Loop Time until ECT reaches Closed Loop temperature* (ECT at engine start 1,200 sec. is less than 6.7C/20F) Time until ECT reaches Closed Loop temperature* (ECT at engine start 300 sec. is between 6.7C/20F and 10C/50F) Time until ECT reaches Closed Loop temperature* (ECT at engine start 120 sec. is 10C/50F or more) 1C (1.8F) or less
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MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. Immediate None P0120 Main Sub Throttle position sensor circuit is open/shorted Throttle position sensor None
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MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. 2 driving cycles None P0121 Main Sub Throttle position sensor malfunction Throttle position sensor Idle switch
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Knock Sensor
Knock Sensor
MONITOR DESCRIPTION
The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the sensor picksup vibrates in a specific frequency range. When the ECM detects voltage in this frequency range, it retards the ignition timing to suppress the spark knock. The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, the ECM interprets this as a fault in the knock sensor and sets a DTC. When the flat type knock sensor is used, the ECM supplies 5 V to the knock sensor and measures this voltage to monitor if knock sensor circuit is open or shorted. If this voltage is out of the specified range, the ECM interprets this as a fault in the knock sensor and sets a DTC. Engines that flat type knock sensor equipped: 2003 1ZZFE (2WD) and 2003 2ZZGE
MONITOR STRATEGY
Related DTCs P0325 Main Sub Continuous 10 sec. 1 sec. Immediate None Knock sensor signal level is too low Knock sensor circuit is open/shorted S Knock sensor signal level is too low S Knock sensor circuit is open/shorted (Flat type knock sensor only) Knock sensor Crankshaft position sensor, ECT sensor and MAF sensor (or MAP sensor)
Case 2: Knock sensor circuit is open/shorted (Knock sensor voltage is low/high) Battery voltage Time after engine start 10.5 V 5 sec.
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MONITOR STRATEGY
Related DTCs P0340 Main Sub Continuous Within 10 sec. 2 driving cycles MIL operation Immediate None No camshaft position signal when starter operates S No camshaft position signal S Camshaft and crankshaft position signal misalignment S Camshaft signal is abnormal S No camshaft position signal S Camshaft and crankshaft position signal misalignment S Camshaft signal is abnormal Camshaft position sensor Crankshaft position sensor
Sequence of operation
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MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous 4.7 sec. 2 driving cycles None P0335 Main Sub No crankshaft position signal Crankshaft position sensor Camshaft position sensor
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MONITOR STRATEGY
Related DTCs Required sensors/Components Frequency of operation Duration MIL operation Sequence of operation Continuous Within 10 sec. 2 driving cycles None P0500 Main Sub Vehicle speed sensor circuit malfunction Vehicle speed sensor (or NC sensor), Skid control ECU and Combination meter Crankshaft position sensor, MAF sensor (or MAP sensor), PNP switch
Vehicle running
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ECM
Power Supply for ECM
MONITOR DESCRIPTION
The battery supplies electricity to the engine control module (ECM) even when the ignition switch is OFF. This electricity allows the ECM store data such as DTC history, freezeframe data, fuel trim values, and other data. If the battery voltage falls below a minimum level, the ECM will conclude that there is a fault in the power supply circuit. At the next engine start, the ECM will turn on the MIL and a DTC will be set.
MONITOR STRATEGY
Related DTCs Required sensors/Components R i d /C t Frequency of operation Duration MIL operation Sequence of operation Continuous 3 sec. Immediate None P1600 Main Sub Battery voltage to ECM is low ECM None
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