Workshop Manual

6E–515
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Detonation/Sparks Knock Symptoms (Cont'd)
Step NoYesValue(s)Action
10 1. Disconnect the ignition coil.
Is the action complete?
— Go to Step 11 —
11 Check the ION sensing harness between the ignition
coil and ION sensing module circuit at the DC motor
harness connector.
Was a problem found?
— Verify repair Go to Step 12
12 Check the following items;
1. Ignition coil and ignition coil circuit.
2. Ignition coil ground circuit for a poor connection.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
— Verify repair Go to Step 13
13 Replace the Ignition coil.
Is the action complete?
— Verify repair Go to Step 14
14 Check the following items;
1. ION sensing module ground circuit for a poor
connection.
2. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
— Go to Step 10 Go to Step 16
15 Replace the ION sensing module.
Is the action complete?
— Verify repair Go to Step 16
16 1. Check fuel pressure. Refer to Chart Fuel System
Pressure Test.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair
Go to Step
17
17 1. Check items that can cause an engine to run lean
(long term fuel trim significantly in the positive
range). For a lean condition, refer to
Diagnostic
Aids
in DTC P0171 Diagnostic Support .
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 18
18 1. Spark plugs for proper heat range. Refer to General
Information
.
2. If incorrect spark plugs are installed, replace spark
plugs as necessary.
Did any spark plugs require replacement?
— Verify repair Go to Step 19
19 1. Remove excessive carbon buildup with a top engine
cleaner. Refer to instructions on the top engine
cleaner can.
2. Re-evaluate vehicle performance.
Is detonation still present?
— Go to Step 20 Verify repair