Check Misfire Count Cyl

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position.

Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / MISFIRE / CYL #1, #2, #3 and #4. Allow the engine to idle.

Read each value for CYL #1 to #4 displayed on the tester. If no misfire counts occur in any cylinders, perform the following procedures:

(1) Shift the gear selector lever to the D position.

(3) If misfire counts are still not displayed, perform steps (h) and (i) and then check the misfire counts again.

Drive the vehicle with the MISFIRE RPM and MISFIRE LOAD noted in the "READ VALUE USING INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)" procedures above.

Read the CYL #1 to #4 or DTCs displayed on the tester.

Result

Result

Misfire Count

Proceed to

Most misfires occur in only 1 or 2 cylinders

A

3 cylinders or more have equal misfire counts

• If it is difficult to reproduce misfires for each cylinder, check the DATA LIST item called MISFIRE MARGIN. Try to find vehicle driving conditions that lower the MISFIRE MARGIN value. Values above 30 % are considered normal.

• If the freeze frame data's record of the ECT is below 75°C (167°F), the misfire may be detected only when the engine is cold.

• If the freeze frame data's record of the ENGINE RUN TIME is below 120 seconds, the misfire may be detected immediately after the engine is started.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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Responses

  • Tomacca
    How to check misfire deteted for toyota camry?
    3 years ago
  • yorda
    What foes misfire margin mean?
    1 year ago

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