Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 833
6E–61
3.2L ENGINE DRIVEABILITY AND EMISSIONS
Engine Cranks But Will Not Run
(Cont'd)
Step
No
Yes
Value(s)
Action
14
1. Ignition “ON.”
2. While the coil connectors are disconnected, touch
each coil connector’s ignition feed terminal with a
grounded test light (the ignition feed wire is black
with orange tracer).
Did the test light illuminate?
—
Go to
Step 16
Go to
Step 15
15
Repair the open ignition feed circuit.
Is the action complete?
—
Verify repair
—
16
While the coil connectors are disconnected, touch
each connector’s secondary ground terminal with a
test light to B+. (The ground wires are black.)
Did the test light illuminate at each coil connector?
—
Go to
Step 18
Go to
Step 17
17
Repair the open secondary ground circuit.
Is the action complete?
—
Verify repair
—
18
1. Test the fuel for contamination.
2. If a problem is found, clean the fuel system and
correct the contaminated fuel condition as
necessary. Replace the fuel filter and replace any
injectors that are not delivering fuel (see Injector
Balance Test).
Was a problem found?
—
Verify repair
Go to
Step 19
19
1. Remove any ignition coil and install a spark tester at
the spark plug end of the coil.
2. Observe the tester while the engine is cranking.
Was a crisp, blue spark observed? Only one or two
sparks followed by no result is considered the same as
“No Spark.”
—
Go to
Step 21
Go to
Step 20
20
Replace the ignition coil, and return to Step 19 to test
the remaining coils.
Is the action complete?
—
Verify repair
—
21
Repeat Step 19 for each coil. Remove only one coil at a
time, and reinstall each coil on its spark plug after
testing, but do not refasten coils with screws at this
time.
After all coils have passed the spark test, does the
engine start?
—
Refasten all
coils with
their screws
Go to
Step 22
22
1. Remove the spark plugs from all cylinders.
2. Visually inspect the spark plug electrodes.
3. Replace any spark plugs with loose or missing
electrodes or cracked insulators.
Did your inspection reveal any spark plugs exhibiting
excessive fouling?
—
Correct the
fouling
condition
Go to
Step 23
6E–62
3.2L ENGINE DRIVEABILITY AND EMISSIONS
Engine Cranks But Will Not Run
(Cont'd)
Step
No
Yes
Value(s)
Action
23
Refer to
Engine Mechanical Diagnosis to diagnose the
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?
—
Verify repair
Go to
Step 25
24
Observe the “Engine Speed” data display on the Tech 2
while cranking the engine.
Is the engine RPM indicated? (If the Tech 2 is normally
powered from the cigarette lighter socket, and if the
Tech 2 display goes blank while cranking the engine, it
will be necessary to power the Tech 2 directly from the
vehicle battery.)
—
Go to
Step 25
Go to
Step 34
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 ECM (female) side of the
7-pin connector.
Is the test light “ON?”
—
Go to
Step 26
Go to
Step 32
26
1. At the ECM (female) side of the connector
mentioned in step 25, 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?
—
Go to
Step 27
Go to
Step 29
27
1. Ignition “OFF,” disconnect the ECM.
2. Ignition “ON,” observe the test light.
Is the test light “ON?”
—
Go to
Step 28
Go to
Step 33
28
Locate and repair the short to ground in the injector
driver circuit.
Is the action complete?
—
Verify repair
—
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?
—
Go to
Step 31
Go to
Step 30
30
Check for an open injector driver circuit.
Was a problem found?
—
Verify repair
Go to
Step 33
6E–63
3.2L ENGINE DRIVEABILITY AND EMISSIONS
Engine Cranks But Will Not Run
(Cont'd)
Step
No
Yes
Value(s)
Action
31
1. At the injector (male) side of the gray connector
mentioned in step 25, connect an ohmmeter
between the ignition pin and one of the driver circuit
pins.
2. Check for continuity in the circuit.
3. Repeat for each injector circuit. The readings
should be approximately equal to the specified
value for injector resistance.
Was a problem found?
12.5 ohms
Verify repair
Go to
Step 8
32
Repair the ignition feed circuit.
Is the action complete?
—
Verify repair
—
33
Replace the ECM.
Is the action complete?
—
Verify repair
—
34
1. Raise the vehicle and disconnect the CKP sensor
harness.
2. Ignition “ON.”
3. With a test light to ground, probe the harness
ignition feed terminal.
Did the light illuminate?
—
Go to
Step 36
Go to
Step 35
35
Check the ignition feed wire between the sensor and
the ECM for a short to ground or open circuit.
Is the action complete?
—
Verify repair
—
36
1. Ignition “ON.”
2. At the CKP harness connector, connect a test light
between the ignition and ground terminals.
Did the light illuminate?
—
Go to
Step 38
Go to
Step 37
37
Check the sensor ground circuit for an open or short to
voltage.
Is the action complete?
—
Verify repair
—
38
Check the signal circuit between the sensor and the
ECM for a short to ground, short to voltage, or an open.
Was a problem found?
—
Verify repair
Go to
Step 39
39
Replace the CKP position sensor.
Is the action complete?
—
Verify repair
Go to
Step 33
6E–64
3.2L ENGINE DRIVEABILITY AND EMISSIONS
Fuel System Electrical Test
060RW058
Circuit Description
When the ignition switch is first turned “ON,” the Engine
Control Module ECM energizes the fuel pump relay which
applies power to the in-tank fuel pump. The fuel pump
relay will remain “ON” as long as the engine is running or
cranking and the ECM is receiving 58X crankshaft
position pulses. If no 58X crankshaft position pulses are
present, the ECM de-energizes the fuel pump relay within
2 seconds after the ignition is turned “ON” or the engine is
stopped.
The fuel pump delivers fuel to the fuel rail and injectors,
then to the fuel pressure regulator. The fuel pressure
regulator controls fuel pressure by allowing excess fuel to
be returned to the fuel tank. With the engine stopped and
ignition “ON,” the fuel pump can be turned “ON” by using a
command by the Tech 2.
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation, or a wire broken inside
the insulation. Check for the following items:
D
Poor connection or damaged harness – Inspect the
ECM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wire connection, and
damaged harness.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. If the fuel pump is operating but incorrect pressure is
noted, the fuel pump wiring is OK and the “Fuel
System Pressure Test” chart should be used for
diagnosis.
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