Isuzu 2000 Trooper Workshop Manual page 973

6E–104
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step
Refer to Engine Mechanical Diagnosis to diagnose the
23
following conditions:
D
Faulty or incorrect camshaft drive belts
D
Leaking or sticky valves or rings
D
Excessive valve deposits
D
Loose or worn rocker arms
D
Weak valve springs
D
Incorrect valve timing
D
Leaking head gasket
Is the action complete?
24 Observe the "Engine Speed" data display on the Tech 2
while cranking the engine.
Is the engine RPM indicated?
25 1. Disconnect the 7-pin gray connector at the rear of
the air filter beneath the point where the air duct
attaches to the MAF sensor.
2. Ignition "ON."
3. Using a test light connected to ground, probe the
ignition terminal at the PCM (female) side of the
7-pin connector.
Is the test light "ON?"
26 1. At the PCM (female) side of the connector, connect
a test light between the ignition + terminal and one
of the injector driver circuits at the same connector.
2. Ignition "ON."
3. Observe the test light, and repeat the test for each
injector driver circuit.
Did the test light stay on when checking any of the 6
injector driver circuits?
27 1. Ignition "OFF," disconnect the PCM.
2. Ignition "ON," observe the test light.
Is the test light "ON?"
28 Locate and repair the short to ground in the
injectordriver circuit.
Is the action complete?
29 1. Using the same test location as in step 26, connect
a test light between the ignition terminal and one of
the driver circuits.
2. Crank the engine and observe the test light.
3. Repeat for each injector driver circuit.
Did the light blink during the test for each circuit?
30 Check for an open injector driver circuit.
Was a problem found?
Engine Cranks But Will Not Run (Cont'd)
Action Value(s) Yes
— Verify repair
— Go to Step 25
— Go to Step 26
— Go to Step 27
— Go to Step 28
— Verify repair
— Go to Step 31
— Verify repair
No
Go to Step 25
Go to Step 34
Go to Step 32
Go to Step 29
Go to Step 33
—
Go to Step 30
Go to Step 33