P0304 1998 TOYOTA CAMRY - Cylinder 4 Misfire Detected

Possible causes

- Faulty spark plug 4

- Clogged or faulty fuel injector 4

- Faulty ignition coil 4

- Fuel injector 4 harness is open or shorted

- Fuel injector 4 circuit poor electrical connection

- Ignition coil 4 harness is open or shorted

- Ignition coil 4 circuit poor electrical connection

- Insufficient cylinder 4 compression

- Incorrect fuel pressure

- Intake air leak

- Manifold absolute pressure sensor

- Engine coolant temp. sensor

- EGR

- ECM

Tech notes

The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"

When is the code detected?

Engine Cylinder 4 is Misfiring.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/loss of power

- Hard start

- Engine hesitation

P0304 1998 Toyota Camry Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0303 1998 TOYOTA CAMRY - Cylinder 3 Misfire Detected

Possible causes

- Faulty spark plug 3

- Clogged or faulty fuel injector 3

- Faulty ignition coil 3

- Fuel injector 3 harness is open or shorted

- Fuel injector 3 circuit poor electrical connection

- Ignition coil 3 harness is open or shorted

- Ignition coil 3 circuit poor electrical connection

- Insufficient cylinder 3 compression

- Incorrect fuel pressure

- Intake air leak

- Manifold absolute pressure sensor

- Engine coolant temp. sensor

- EGR

- ECM

Tech notes

The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"

When is the code detected?

Engine Cylinder 3 is Misfiring.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/loss of power

- Hard start

- Engine hesitation

P0303 1998 Toyota Camry Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0302 1998 TOYOTA CAMRY - Cylinder 2 Misfire Detected

Possible causes

- Faulty spark plug 2
- Clogged or faulty fuel injector 2
- Faulty ignition coil 2
- Fuel injector 2 harness is open or shorted
- Fuel injector 2 circuit poor electrical connection
- Ignition coil 2 harness is open or shorted
- Ignition coil 2 circuit poor electrical connection
- Insufficient cylinder 2 compression
- Incorrect fuel pressure
- Intake air leak
- Manifold absolute pressure sensor
- Engine coolant temp. sensor
- EGR
- ECM

Tech notes

The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"

When is the code detected?

Engine Cylinder 2 is misfiring.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/loss of power

- Hard start

- Engine hesitation

P0301 1998 Toyota Camry Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0301 1998 TOYOTA CAMRY - Cylinder 1 Misfire Detected

Possible causes

- Faulty spark plug 1

- Clogged or faulty fuel injector 1

- Faulty ignition coil 1

- Fuel injector 1 harness is open or shorted

- Fuel injector 1 circuit poor electrical connection

- Ignition coil 1 harness is open or shorted

- Ignition coil 1 circuit poor electrical connection

- Insufficient cylinder 1 compression

- Incorrect fuel pressure

- Intake air leak

- Manifold absolute pressure sensor

- Engine coolant temp. sensor

- EGR

- ECM

Tech notes

The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 1. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"

When is the code detected?

Engine Cylinder 1 is misfiring.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/loss of power

- Hard start

- Engine hesitation

P0301 1998 Toyota Camry Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0300 1998 TOYOTA CAMRY - Random Cylinder Misfire Condition

Possible causes

- Faulty spark plug (s) 

- Faulty ignition coil (s) 

- Clogged or faulty fuel injector (s)

- Intake air leak

- Fuel injectors harness is open or shorted

- Fuel Injectors circuit poor electrical connection

- Ignition coils harness is open or shorted

- Ignition coils circuit poor electrical connection

- Insufficient cylinders compression

- Incorrect fuel pressure

- Manifold absolute pressure sensor

- Engine coolant temp. sensor

- EGR

- ECM

When is the code detected?

The control module monitors the crankshaft speed and has detected a misfire condition

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/loss of power

- Hard start

- Engine hesitation

P0300 1998 Toyota Camry Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

P0172 1998 TOYOTA CAMRY - System Too Rich Bank 1

Possible causes

- Faulty front heated oxygen sensor

- Ignition misfiring

- Faulty fuel injectors

- Exhaust gas leaks

- Incorrect fuel pressure 

- Faulty Mass Air Flow (MAF) sensor

When is the code detected?

- Fuel injection system does not operate properly.

- The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Excessive Fuel Consumption

P0172 1998 Toyota Camry Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

P0171 1998 TOYOTA CAMRY - Air/Fuel Mixture System Lean Bank 1

Possible causes

- Intake air leaks

- Faulty front heated oxygen sensor

- Ignition misfiring

- Faulty fuel injectors

- Exhaust gas leaks

- Incorrect fuel pressure

- Lack of fuel

- Faulty Mass Air Flow (MAF) sensor

- Incorrect Positive Crankcase Ventilation (PCV) hose connection

When is the code detected?

- Fuel injection system does not operate properly. 

- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Excessive Fuel Consumption

P0171 1998 Toyota Camry Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

P0141 1998 TOYOTA CAMRY - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 2

Possible causes

- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2

- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse

- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground

- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection

- Faulty Engine Control Module (ECM)

Tech notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem

When is the code detected?

Current amperage in the rear heated oxygen sensor heater circuit is out of the normal range.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Possible higher than usual fuel Consumption

P0141 1998 Toyota Camry Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

P0136 1998 TOYOTA CAMRY - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

Possible causes

- Faulty Rear Heated Oxygen Sensor Bank 1

- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted

- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection

- Inappropriate fuel pressure

- Faulty fuel injectors

- Intake air leaks may be faulty

- Exhaust gas leaks

Tech notes

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

When is the code detected?

It takes more time for the sensor to respond between rich and lean than the specified time.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- High Fuel Consumption

- Excessive Smoke from Exhaust

P0136 1997 Toyota Camry Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

P0135 1998 TOYOTA CAMRY - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Possible causes

- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1

- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse

- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground

- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection

- Faulty Engine Control Module (ECM)

Tech notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem

When is the code detected?

Current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heat

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Possible higher than usual fuel Consumption

P0135 1998 Toyota Camry Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

P0133 1998 TOYOTA CAMRY - Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1

Possible causes

- Faulty Front Heated Oxygen Sensor Bank 1

- Front Heated Oxygen Sensor Bank 1 harness is open or shorted

- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection

- Inappropriate fuel pressure

- Faulty fuel injectors

- Intake air leaks may be faulty

- Exhaust gas leaks

When is the code detected?

The response of the voltage signal from the sensor takes more than the specified time.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- High Fuel Consumption

- Excessive Smoke from Exhaust

P0133 1998 Toyota Camry Description

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

P0130 1998 TOYOTA CAMRY - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 1

Possible causes

- Faulty Front Heated Oxygen Sensor Bank 1

- Front Heated Oxygen Sensor Bank 1 harness is open or shorted

- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection

- Inappropriate fuel pressure

- Faulty fuel injectors

- Intake air leaks may be faulty

- Exhaust gas leaks

When is the code detected?

The response of the voltage signal from the sensor takes more than the specified time.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- High Fuel Consumption

- Excessive Smoke from Exhaus

P0130 1998 Toyota Camry Description

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

P0125 1998 TOYOTA CAMRY - Insufficient Coolant Temperature for Closed Loop Fuel Control

Possible causes

- Faulty Oxygen (O2) Sensor (Air/Fuel Sensor for California Models)

- O2 sensor harness is open or shorted

- O2 sensor electrical circuit poor connection

- Fuel system

- Air induction system

- Fuel Injector

- Faulty Engine Control Module (ECM)

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P0125 1998 Toyota Camry Description

To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three–way catalytic converter is used, but for the most efficient use of the three–way catalytic converter, the air–fuel ratio must be precisely controlled so that it is always close to the stoichiometric air–fuel ratio.

The oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the stoichiometric air–fuel ratio.

This is used to detect the oxygen concentration in the exhaust gas and provide feedback to the computer for control of the air–fuel ratio.

When the air–fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the oxygen sensor informs the ECM of the LEAN condition (small electromotive force: < 0.45 V).

When the air–fuel ratio is RICHER than the stoichiometric air–fuel ratio the oxygen concentration in the exhaust gas in reduced and the oxygen sensor informs the ECM of the RICH condition (large electromotive force: > 0.45V).

The ECM judges by the electromotive force from the oxygen sensor whether the air–fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if malfunction of the oxygen sensor causes output of abnormal electromotive force, the ECM is unable to perform accurate air–fuel ratio control.

The oxygen sensors include a heater which heats the zirconia element. The heater is controlled by the ECM.

When the intake air volume is low (the temp. of the exhaust gas is low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.

P0121 1998 TOYOTA CAMRY - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance

Possible causes

- Faulty throttle position sensor
- Throttle position sensor harness is open or shorted
- Throttle position sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)

When is the code detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P0121 1998 Toyota Camry Description

The throttle position sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.

Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

P0120 1998 TOYOTA CAMRY - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Possible causes

- Faulty Throttle Position Sensor

- Throttle Position Sensor circuit is open or shorted

- Throttle Position Sensor poor electrical connection

Tech notes

Very common problem with Toyota models. Before replacing any parts, try cleaning the throttle body and reset the light. If the codes come back, then it will necessary to replaced the throttle position sensor (TPS). Most auto parts sell the TPS for around $60.

When is the code detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P0120 1998 Toyota Camry Description

The throttle position sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.

Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

P0116 1998 TOYOTA CAMRY - Engine Coolant Temperature Circuit Range/Performance Problem

Possible causes

- Low engine coolant level

- Faulty Engine Coolant Temperature (ECT) sensor

- Faulty engine coolant thermostat

- Engine Coolant Temperature (ECT) sensor harness is open or shorted

- Engine Coolant Temperature (ECT) sensor circuit poor electrical connection

When is the code detected?

Coolant temperature signal sent to the ngine Control Module (ECM) is not within specified range.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P0116 1998 Toyota Camry Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

P0115 1998 TOYOTA CAMRY - Engine Coolant Temperature Circuit

Possible causes

- Low engine coolant level

- Faulty Engine Coolant Temperature (ECT) sensor

- Faulty engine coolant thermostat

- Engine Coolant Temperature (ECT) sensor harness is open or shorted

- Engine Coolant Temperature (ECT) sensor circuit poor electrical connection

When is the code detected?

An excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P0115 1998 Toyota Camry Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

P0110 1998 TOYOTA CAMRY - Intake Air Temperature Circuit Malfunction

Possible causes

- Faulty Intake Air Temperature (IAT) sensor

- Dirty air filter

- Intake Air Temperature (IAT) sensor harness is open or shorted

- Intake Air Temperature (IAT) sensor circuit poor electrical connection

Tech notes

Before replacing any parts you can try to clean the mass air flow sensor with mass air flow sensor cleaner.

When is the code detected?

An excessively low or high voltage from the sensor is sent to ECM.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P0110 1998 Toyota Camry Description

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM). The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle.

P0106 1998 TOYOTA CAMRY - Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

Possible causes

- Faulty Manifold Absolute Pressure sensor

- Manifold Absolute Pressure harness is open or shorted

- Manifold Absolute Pressure sensor circuit poor electrical connection

- Vacuum line

- Faulty Engine Control Module (ECM)

When is the code detected?

An excessively low or high voltage from the sensor is sent to ECM

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Engine rough idle

- Engine hesitation

P0106 1998 Toyota Camry Description

By a built–in sensor unit, the manifold absolute pressure sensor detects the intake manifold pressure as a voltage. The ECM then determines the basic injection duration and basic injection advance angle based on this voltage. Since the manifold absolute pressure sensor does not use the atmospheric pressure as a criterion, but senses the absolute pressure inside the intake manifold (the pressure in proportion to the present absolute vacuum 0), it is not influenced by fluctuations in the atmospheric pressure due to high altitude and other factors. This permits it to control the air–fuel ratio at the proper lever under all conditions.

P0105 1998 TOYOTA CAMRY - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction

Possible causes

- Faulty Manifold Absolute Pressure sensor

- Manifold Absolute Pressure harness is open or shorted

- Manifold Absolute Pressure sensor circuit poor electrical connection

- Faulty Engine Control Module (ECM)

When is the code detected?

An excessively low or high voltage from the sensor is sent to ECM.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Engine rough idle

- Engine hesitation

P0105 1998 Toyota Camry Description

By a built–in sensor unit, the manifold absolute pressure sensor detects the intake manifold pressure as a voltage. The ECM then determines the basic injection duration and basic injection advance angle based on this voltage. Since the manifold absolute pressure sensor does not use the atmospheric pressure as a criterion, but senses the absolute pressure inside the intake manifold (the pressure in proportion to the present absolute vacuum 0), it is not influenced by fluctuations in the atmospheric pressure due to high altitude and other factors. This permits it to control the air–fuel ratio at the proper lever under all conditions

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