Toyota Tacoma manuals

Toyota Corolla Repair Manual: Monitor description

Dtc p0451, p0452 or p0453 is recorded by the ecm when the vapor pressure sensor malfunctions.

P0451

The ecm senses pressure in the fuel tank using the vapor pressure sensor. The ecm supplies the sensor with a regulated 5 v referencevoltage and the sensor returns a signal voltage between 0.5 V and 4.5 V according to the pressure level in the fuel tank.

When the pressure in the fuel tank is low, the output voltage of the vapor pressure sensor is low. When it is high, the output voltage is high.

For this dtc p0451, the ecm checks for a noisy sensor or a stuck sensor.

The ecm checks for the noisy sensor by monitoring the fuel tank pressures when the vehicle is stationary and there should be little variation in the tank pressure. If the indicated pressure varies beyond specified limits, the ecm will illuminate the mil and a dtc is set.

The ecm checks for the stuck sensor by monitoring the fuel tank pressure for an extended time period.

If the indicated pressure does not change over this period, the ecm will conclude that the fuel tank pressure sensor is malfunctioning. The ecm will illuminate the mil and a dtc is set.

P0452 and p0453

The ecm senses pressure in the fuel tank using the vapor pressure sensor. The ecm supplies the sensor with a regulated 5 v referencevoltage and the sensor returns a signal voltage between 0.5 V and 4.5 V according to the pressure level in the fuel tank.

When the pressure in the fuel tank is low, the output voltage of the vapor pressure sensor is low. When it is high, the output voltage is high.

If the output voltage of the vapor pressure sensor is out of the normal range, the ecm will determine that there is a malfunction in the sensor or sensor circuit.

When pressure indicated by the vapor pressure sensor deviates below 3.999 Kpa (30 mmhg) or above 1.999 Kpa (15 mmhg), the ecm interprets this as a malfunction in the vapor pressure sensor. The ecm will turn on the mil and a dtc will be set.

Monitor strategy

Monitor strategy

P0451

P0452 and p0453

P0452 and p0453

Typical enabling conditions

Typical enabling conditions

P0451

P0452 and p0453

P0452 and p0453

Typical malfunction thresholds

Typical malfunction thresholds

P0451

P0452 and p0453

P0452 and p0453

Wiring diagram

Wiring diagram

Refer to dtc no. P0441

Evaporative emission control system pressure sensor
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Inspection procedure
Hint: if different dtcs related to different systems that have terminal e2 as the ground terminal are output simultaneously, terminal e2 may be open. If dtc p0441 (purge flow), p0446 (vsv f ...

Other materials:

Replacement
Hint: installation is in the reverse order of the removal. But the installation is indicated only when it has a point. 1. Remove rear door opening trim rh 2. Remove rear door opening trim lh 3. Remove rear seat cushion assembly ( or 728) 4. Remove rear seat back assy (fixed type rear seat) ...

Skid control sensor
Replacement Hint: replace the rh side by the same procedure as the lh side. 1. Remove rear wheel 2. Remove rear brake drum subassy 3. Disconnect skid control sensor wire Disconnect the skid control sensor wire connector from the skid control sensor. 4. Remove rear axle hub & ...

For vehicles equipped with catalytic converter
Caution: if large amount of unburned fuel flows into the converter, it may cause overheating and a fire hazard. To prevent this, observe the following precautions. Use only unleaded gasoline.  avoid prolonged idling. Avoid running the engine at idle speed for more than 20 minutes. ...

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