Workshop Manual

6E–273
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
If the harness appears to be OK, observe the Knock
Present, Knock Sensor Noise Channel display on
the Tech 2 while moving connectors and wiring
harnesses related to the sensor.
A change in the display will indicate the location of
the fault.
If DTC P0325 cannot be duplicated, the information
included in the Failure Records data can be useful in
determined vehicle mileage since the DTC was last
set.
If it is determined that the DTC occurs intermittently,
performing the DTC P0325 Diagnostic Chart may
isolate the cause of the fault.
DTC P0325 - ION Sensing Module Knock Intensity Circuit Fault
Step Action Value(s) Yes No
1 Was the “On-Board (OBD) System Check” performed?
— Go to Step 2
Go to OBD
System
Check
2 1. Ignition “ON”, engine “OFF”.
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor “DTC” info for DTC P0325.
Does the Tech 2 indicate DTC P0325 failed this
ignition?
— Go to Step 3
Refer to
Diagnostic
Aids
3 1. Ignition “OFF”.
2. Disconnect the ION sensing module.
3. Disconnect the PCM.
Is the action complete?
— Go to Step 4 —
4 Check the ION sensing harness between the PCM
(F68) and ION sensing module circuit (RED Wire) at
the KI line harness connector.
Was a problem found?
— Verify repair Go to Step 5
5 1. Disconnect the ignition coil.
Is the action complete?
— Go to Step 6 —
6 Check the ION sensing harness for open or short circuit
between the ignition coil and ION sensing module
circuit at the harness connector.
Was a problem found?
— Verify repair Go to Step 7
7 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 8
8 Replace the Ignition coil.
Is the action complete?
— Verify repair Go to Step 9
9 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 11
10 Repair wiring harness.
Is the action complete?
— Verify repair Go to Step 11