Perform Active Test Using Intelligent Tester Fuel Cut To

Allow the engine to idle.

Select the following menu items: DIAGNOSIS /

ENHANCED OBD II / ACTIVE TEST / FUEL CUT#1 (to

If a cylinder has a high misfire count, cut fuel to that cylinder. Compare the misfire count of the cylinder before fuel cut and after fuel cut.

Result

Misfire Count in Each Cylinder

Proceed to

Misfire count of cylinder before fuel cut and after fuel cut roughly same

A

Misfire count of cylinder before fuel cut lower than after fuel cut

This ACTIVE TEST cannot be performed while the vehicle is being driven.

HINT:

If the misfire count of the cylinder before and after the fuel cut are roughly the same, the cylinder is misfiring. If the misfire count of the cylinder before the fuel cut is lower than after the fuel cut, the cylinder misfires sometimes.

Go to step 11

CHECK SPARK PLUG

1

V

J

t

J

Electrode Gap

A74353

A088861E01

(a) Remove the ignition coil and the spark plug of the misfiring cylinder.

(b) Measure the spark plug electrode gap. Standard gap:

(c) Check the electrode for carbon deposits. Recommended spark plug:

Manufacturers

Products

DENSO

SK20R11

NGK

If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

REPLACE SPARK PLUG

CHECK FOR SPARKS AND IGNITION

(a) Perform a spark test. CAUTION:

All ways disconnect all fuel injector connectors. NOTICE:

Do not crank the engine for more than 2 seconds.

(1) Remove the ignition coil from the cylinder head.

(2) Install the spark plug onto the ignition coil.

(3) Disconnect the 4 fuel injector connectors.

(4) Attach the spark plug assembly to the cylinder head.

(5) Crank the engine for less than 2 seconds and check for sparks.

Sparks jump across electrode gap.

(6) Reconnect the 4 fuel injector connectors.

(7) Install the ignition coil.

Go to step 9

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

(a) Measure the cylinder compression pressure of the misfiring cylinder (See page EM-3).

Go to step 10

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

CHANGE NORMAL SPARK PLUG AND CHECK FOR SPARKS OF MISFIRING CYLINDER

(a) Change the installed spark plug with a spark plug that functions normally.

(b) Perform a spark test. CAUTION:

Always disconnect all fuel injector connectors. NOTICE:

Do not crank the engine for more than 2 seconds.

(1) Install the spark plug onto the ignition coil.

(2) Disconnect the 4 fuel injector connectors.

(3) Attach the spark plug assembly to the cylinder head.

(4) Crank the engine for less than 2 seconds and check for sparks.

Sparks jump across electrode gap.

(5) Reconnect the 4 fuel injector connectors.

(6) Install the ignition coil.

REPLACE IGNITION COIL ASSEMBLY THEN CONFIRM THAT THERE IS NO MISFIRE

REPLACE SPARK PLUG

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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