Check Misfire Count Cyl

Total OBD & ECU Auto Diagnostics

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Connect an intelligent tester to the DLC3.

Turn the ignition switch ON.

Turn the tester ON.

Clear DTCs (See page ES-38).

Select the following menu items: DIAGNOSIS /

Allow the engine to idle.

Read each value of CYL #1 to #6 displayed on the tester. If no misfire counts occur in any cylinders, perform the following operations:

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

(4) 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 step 2.

(i) Read the CYL #1 to #6 or DTCs displayed on the tester.

Result

Misfire count

Proceed To

One or two cylinders have misfire counts

A

Three cylinders or more have misfire counts

CHECK SPARK PLUG

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

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

Between 1.0 mm and 1.1 mm (0.039 in. and 0.043 in.)

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

Manufactures

Products

DENSO

K20HR-U11

NGK

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

(d) Reinstall the ignition coil and the spark plug.

REPLACE SPARK PLUG

CHECK SPARKS AND IGNITION

(a) Disconnect the injector connectors, in order to prevent the engine from starting.

(b) Install the spark plug to the ignition coil.

(c) Attach the spark plug assembly to the cylinder head cover.

(d) Crank the engine for less than 2 seconds and check the spark.

Sparks jump across electrode gap

(e) Reconnect the injector connectors.

NGj>

Go to step 8

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

(a) Measure the cylinder compression pressure of the misfiring cylinder.

Go to step 9

REPAIR OR REPLACE MALFUNCTION PARTS

CHANGE NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

Change the installed spark plug to a spark plug that functions normally. Perform a spark test. CAUTION:

Always disconnect each injector connector. NOTICE:

Do not crank the engine for more than 2 seconds.

Install the spark plug to the ignition coil and connect the ignition coil connector. Disconnect the injector connector. Ground the spark plug.

Check if sparks occur while the engine is being cranked.

Sparks jump across electrode gap.

REPLACE IGNITION COIL ASSEMBLY THEN CONFIRM THAT THERE IS NO MISFIRE

REPLACE SPARK PLUG

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