Workshop Manual

6E–271
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0306 – Cylinder Misfire Detected (Cont'd)
Step NoYesValue(s)Action
6 1. Remove and visually/physically inspect the ignition
coil associated with cylinder #6. Ensure that the coil
is free of cracks and carbon tracking.
2. If a problem is found, replace the damaged ignition
coil as necessary.
Did the visual inspection reveal a problem?
— Verify repair Go to Step 7
7 1. Measure the ignition coil primary resistance.
2. If resistance is not within the specified value,
replace the faulty ignition coil.
Did the ignition coil require replacement?
2.6-2.7 KW Verify repair Go to Step 12
8 Remove the cylinder #6 spark plug and visually inspect
the spark plug electrode.
Does the inspection reveal excessive fouling?
—
Go to
Contaminatio
n Diagnosis
chart in
Engine
Mechanical
Diagnosis
Go to Step 9
9 1. Visually inspect the spark plug insulator for cracks,
carbon tracking, or other damage.
2. If the spark plug is damaged, replace the spark plug.
Did the inspection reveal a problem?
— Verify repair Go to Step 10
10 1. Perform the “Injector Coil/Balance Test”.
2. If any faulty injectors are found, replace them as
necessary.
Did any of the injectors require replacement?
— Verify repair Go to Step 11
11 1. Inspect the intake manifold and the injector O-rings
for a vacuum leak.
2. If a problem is found, repair it as necessary.
Did the inspection reveal a problem?
— Verify repair Go to Step 12
12 Check for an engine mechanical problem. Refer to
Engine Mechanical Diagnosis to diagnose and repair
the following conditions:
B A faulty or incorrect camshaft
B Leaking or sticky valves or rings
B Excessive valve deposits
B Weak valve springs
B A leaking head gasket
Was a basic engine mechanical problem found?
— Verify repair
Refer to
Diagnostic
Aids