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:

General information
Electronic control devices are installed in the vehicle. Electronic control units process data they receive from vehicle sensors, self-generate or exchange with each other. Some control units are necessary for the vehicle to function safely or provide assistance during driving, for instance driver ...

Replacement
1. Remove engine under cover rh 2. Drain coolant 3. Remove front wheel rh 4. Remove cylinder head cover no.2 Remove the 2 nuts, 2 clips and cylinder head cover. 5. Remove fan and generator v belt Turn the v–ribbed belt tensioner slowly clockwise and loosen it. Then, remove t ...

Providing assistance
Hazard warning flashers The button is located in the center console. Breakdown assistance BMW Roadside Assistance Via iDrive: 1. "ConnectedDrive". 2. "BMW Assist". 3. "BMW Roadside Assistance". A voice connection is established to BMW Roadside Assistance. ConnectedDrive Concierge service The BMW ...

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