Isuzu 2000 Trooper Workshop Manual page 1325

6E–456
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
D Poor connection at PCM-Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
D Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P1312 cannot be duplicated, the
DTC P1312 - ION Sensing Module SEC line 2 Circuit Fault
Step
1 Was the "On-Board (OBD) System Check" performed?
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 P1312.
Does the Tech 2 indicate DTC P1312 failed this
ignition?
3 1. Ignition "OFF."
2. Disconnect the ION Sensing module.
3. Disconnect the PCM.
Is the action complete?
4 Check the ION Sensing module harness between the
PCM and ICSS module circuit at the ION Sensing
Module harness connector.
Was a problem found?
5 1. Disconnect the ignition coil.
Is the action complete?
6 Check the ION Sensing module harness between the
ignition coil and ION Sensing module circuit at the SEC
line 2 harness connector.
Was a problem found?
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?
8 Replace the Ignition coil.
Is the action complete?
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?
Action
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 P1312
Diagnostic Chart may isolate the cause of the
fault.
Value(s) Yes
— Go to Step 2
— Go to Step 3
Go to Step 4
—
— Verify repair
— Go to Step 6
— Verify repair
— Verify repair
— Verify repair
— Go to Step 10
No
Go to OBD
System
Check
Refer to
Diagnostic
Aids
Go to Step 3
Go to Step 6
Go to Step 5
Go to Step 7
Go to Step 8
Go to Step 9
Go to Step 11