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Toyota Corolla Repair Manual: Check mode procedure

Hint

: handheld tester only: compared to the normal mode, the check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode.

1. Check mode procedure(using the handheld tester)

  1. Check the initial conditions.
  1.  Battery positive voltage 11 v or more
  2.  throttle valve fully closed
  3.  transmission in the p or n position
  4.  a/c switched off
  1.  turn the ignition switch off.
  2.  connect the handheld tester to the dlc3.
  3.  turn the ignition switch on.
  4.  switch the handheld tester from the normal mode to the check mode (check that the mil flashes).

Notice:

Notice

: if the handheld tester switches the ecm from the normal mode to the check mode or viceversa, or if the ignition switch is turned from on to acc or off during the check mode, the dtc and freeze frame data will be erased.

  1. Start the engine (mil goes off after the engine starts).
  2.  simulate the conditions of the malfunction described by the customer.

Notice

: leave the ignition switch on until you have checked the dtc, etc.

  1. After simulating the malfunction conditions, check the dtc and freeze frame data, etc using the handheld tester diagnosis selector.

Hint

: do not turn the ignition switch off, as turning it off switches the diagnosis system from the check mode to the normal mode, which erases all the dtcs, etc.

  1. After checking the dtc, inspect the applicable circuit.

2. Clear dtc (using the obd ii scan tool or handheld tester)

  1. Connect the obd ii scan tool or handheld tester to the dlc3.
  2.  turn the ignition switch on.
  3.  operate the obd ii scan tool or handheld tester to erase the codes. All the dtcs and freeze frame data will be erased. (See the obd ii scan tools instruction book for operating instructions.)

3. Clear dtc (not using the obd ii scan tool or hand held tester)

  1. Disconnect the battery terminal or remove the efi fuse from the engine room r/b for more than 60 seconds.
Dtc check/clear
Notice: if there is no dtc in the normal mode, check the pending fault code using the continuous test results function (mode 7 for sae j1979) on the obd ii scan tool or the handheld tester. ...

Basic inspection
When the malfunction is not confirmed in the dtc check, troubleshooting should be carried out in all the possible circuits considered as causes of the problem. In many cases, by carrying out the ...

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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 for ccv), p0451, p0452 or p0453 (evaporative pressure sensor) is output with dtc p0442 or p0456, ...

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