Toyota Tacoma manuals

Toyota Corolla Repair Manual: Inspection procedure

Hint

: read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc. At the time of the malfunction.

1 Check other dtc output(in addition to dtc p0420)

  1. Connect the hand–held tester or the obd ii scan tool to the dlc3.
  2.  turn the ignition switch on and push the hand–held tester or the obd ii scan tool main switch on.
  3.  select the item ”diagnosis / enhanced obd ii / dtc info / current codes”.
  4.  read the dtcs.

Result:

Hint:

Hint

: if any other codes besides p0420 are output, perform the troubleshooting for those dtcs first.

2 Check for exhaust gas leakage

2 Check for exhaust gas leakage

3 Inspect heated oxygen sensor(bank 1 sensor 1)

3 Inspect heated oxygen sensor(bank 1 sensor 1)

Refer to the hint below.

4 Inspect heated oxygen sensor(bank 1 sensor 2)

4 Inspect heated oxygen sensor(bank 1 sensor 2)

Refer to the hint below.

Replace three–way catalytic converter(exhaust manifold)

Replace three–way catalytic converter(exhaust manifold)

Hint

: hand–held tester only:

  1. Perform active test using hand–held tester (a/f control).

Hint

: ”a/f control” is active test which changes the injection volume –12.5 % Or +25 %.

  1.  Connect the hand–held tester to the dlc3 on the vehicle.
  2.  Turn the ignition switch on.
  3.  Warm up the engine by running the engine speed at 2,500 rpm for approximately 90 seconds.
  4.  Select the item ”diagnosis / enhanced obd ii / active test / a/f control”.
  5.  Perform ”a/f control” with the engine in an idle condition (press the right or left button).

Result: heated oxygen sensor reacts in accordance with increase and decrease of injection volume
+25 %  rich output: more than 0.5 V, –12.5 %  Lean output: less than 0.4 V

Notice

: there is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).

The following of a/f control procedure enables the technician to check and

The following of a/f control procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.

For displaying the graph indication, enter ”active test / a/f control / user data”, then select ”o2s b1s1 and o2s b1s2” by pressing ”yes” button and push ”enter” button before pressing ”f4” button.

Circuit description
The ecm compares the two waveforms of the heated oxygen sensors located before and after the catalyst to determine whether or not the catalyst performance has deteriorated. Air–fuel ratio feedba ...

Evaporative emission control system
Dtc p0441 evaporative emission control system incorrect purge flow Dtc p0446 evaporative emission control system vent control circuit ...

Other materials:

Brake
On–vehicle inspection 1. Inspect brake line pipes and hoses Hint: work in a well–lighted area. Turn the front wheels fully to the right or left before begining.  check all the brake lines and hoses for: damage wear deformation cracks corrosion leaks bends twists ...

Changing the engine switch positions
1 “LOCK” The steering wheel is locked and the key can be removed. (Vehicles with an automatic transmission or continuously variable transmission: The key can be removed only when the shift lever is in P.) 2 “ACC” Some electrical components such as the audio system can be used. 3 “ON” All ele ...

Selecting, fast-forwarding and reversing tracks/files/songs
■ Selecting a track/file/song Press the “∧” or “∨” button on “SEEK/TRACK” or turn the “TUNE/ SCROLL” knob to select the desired track/file/song number. To fast-forward or reverse, press and hold the “∧” or “∨” button on “SEEK/TRACK”. ■ Selecting a track/file/ ...

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