Isuzu 2000 Trooper Workshop Manual page 1385

6E–516
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step
11 1. Visually/physically
conditions:
D
Restricted air intake system. Check for a
possible collapsed air intake duct, restricted
air filter element, or foreign objects blocking
the air intake system.
D
Large vacuum leak. Check for a condition that
causes a large vacuum leak, such as an
incorrectly installed or faulty PCV valve or
brake booster hose disconnected .
2. If a problem is found, repair as necessary.
Was a problem found?
12 Check the injector connections. If any of the injectors
are connected to an incorrect cylinder, correct as
necessary.
Was a problem found?
13 1. Perform the "Injector Coil/Balance Test" in Fuel
Metering System .
2. If a problem is found, repair as necessary.
Was a problem found?
14 1. Check for fuel in the pressure regulator vacuum
hose.
2. If fuel is present, replace the fuel pressure regulator
assembly. Refer to Fuel Metering System .
3. If a problem is found, repair as necessary.
Was a problem found?
15 1. Check for proper ignition voltage output with spark
tester J 26792 (ST-125). Refer to Electronic Ignition
System for the procedure.
2. If a problem is found, repair as necessary.
Was a problem found?
16 1. Remove spark plugs. Check for wet plugs, cracks,
wear, improper gap, burned electrodes, or heavy
deposits. Refer to Electronic Ignition System .
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Was a problem found?
17 1. Check for a loose ignition coil ground and ION
Sensing module circuit.
2. If a problem is found, repair as necessary.
Was a problem found?
18 1. Check ignition coils for cracks or carbon tracking.
2. If a problem is found, repair as necessary.
Was a problem found?
19 Using a Tech 2, monitor the TP 1, 2 angle with the
engine idling.
Is the TP angle at the specified value and steady?
Cuts Out, Misses Symptom (Cont'd)
Action
inspect for the following
Value(s) Yes
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
8 ∼ 10%
Go to Step 20
No
Go to Step 9
Go to Step 13
Go to Step 14
Go to Step 15
Go to Step 16
Go to Step 17
Go to Step 18
Go to Step 19
Refer to DTC
P0123 for
further
diagnosis