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
Dtc p0451 evaporative emission control system pressure sensor range/performance Dtc p0452 evaporative emission control system pressure sensor/switch low input Dtc p0453 evaporative emission cont ...

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:

Air conditioning filter
The air conditioning filter must be changed regularly to maintain air conditioning efficiency. Removal method 1Turn the engine switch off. 2 Open the glove box. Slide off the damper. 3 Push in the glove box on the vehicles outer side to disconnect the claws. Then pull out the glove box an ...

Child restraint systems with a top tether strap
1 Adjust the head restraint to the downmost position. 2 Secure the child restraint system using the seat belt or LATCH anchors. 3 Open the anchor bracket cover, latch the hook onto the anchor bracket and tighten the top tether strap. Make sure the top tether strap is securely latched. ` ...

Check open circuit
For the open circuit in the wire harness in fig. 1, Perform a resistance check in step (b) or a voltage check in step (c) to locate the section. Check the resistance.  Disconnect connectors a and c and measure the resistance between them. Resistance: 1 Ω or les ...

2011-2019 Copyright www.tcorolla.net