Isuzu Rodeo UE. Service manual — part 178
6E1–83
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Circuit Description
The electronic ignition system uses a dual coil method of
spark distribution. In this type of ignition system, the
powertrain control module (PCM) triggers the correct
driver inside the ignition control module (ICM), which then
triggers the correct ignition coil based on the 58X signal
received from the crankshaft position sensor (CKP). The
spark plug connected to the coil fires when the ICM opens
the ground circuit for the coil’s primary circuit.
During crank, the PCM monitors the CKP 58X signal. The
CKP signal is used to determine which cylinder will fire
first. After the CKP 58X signal has been processed by the
PCM, it will command all four injectors to allow a priming
shot of fuel for all the cylinders. After the priming, the
injectors are left OFF during the next four 58X reference
pulses from the CKP. This allows each cylinder a chance
to use the fuel from the priming shot. During this waiting
period, a camshaft position (CMP) signal pulse will have
been received by the PCM. The CMP signal allows the
PCM to operate the injectors sequentially based on
camshaft position. If the camshaft position signal is not
present at start–up, the PCM will begin sequential fuel
delivery with a 1–in–4 chance that fuel delivery is correct.
The engine will run without a CMP signal, but will set a
DTC code.
Diagnostic Aids
An intermittent problem may be caused by a poor
connection, rubbed–through wire insulation or a wire
broken inside the insulation. Check for the following
items:
f
Poor connection or damaged harness – Inspect the
PCM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal–to–wire connection, and
damaged harness.
f
Faulty engine coolant temperature sensor – Using a
Tech 2, compare engine coolant temperature with
intake air temperature on a completely cool engine.
Engine coolant temperature should be within 10
°
C of
intake air temperature. If not, replace the ECT sensor.
Engine Cranks But Will Not Run
Step
Action
Value(s)
Yes
No
1
Was the ”On–Board Diagnostic (OBD) System Check”
performed?
—
Go to Step 2
Go to OBD
System
Check
2
Use the Tech 2 and check for any DTC’s.
Are any DTC’s stored?
—
Go to
Applicable
DTC Table
Go to Step 3
3
Check the 15A ignition coil fuse, the 15A engine device
fuse, and the 15A ECM fuse.
Was a fuse blown?
—
Go to Step 4
Go to Step 5
4
Check for a short to ground and replace the fuse.
Is the action complete?
—
Verify repair
—
5
1. Ignition ON.
2. Use a grounded test lamp to verify that B+ is
available at the ignition coil fuse, the engine device
fuse, and the ECM fuse.
Was B+ available at the fuses?
—
Go to Step 7
Go to Step 6
6
Repair the open ignition feed circuit.
—
Go to Fuel
System
Electrical Test
Go to Fuel
System
Diagnosis
7
1. Disconnect the ignition secondary wire at the No.1.
2. Install a spark tester J 26792 at the end of the
disconnected ignition coil.
3. Clip the spark tester J 26792 to a good ground (not
near the battery).
4. Observe the spark 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 16
Go to Step 8
6E1–84
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Engine Cranks But Will Not Run
(Cont'd)
Step
No
Yes
Value(s)
Action
8
1. Disconnect the ignition module harness connector.
2. Check for an open or short circuit between the
ignition control module and the PCM?
Was a problem found?
—
Go to Step 9
Go to Step 10
9
Repair the faulty circuit.
—
Verify repair
—
10
1. Ignition ON.
2. Using a Digital Voltmeter (DVM) check the ignition
wire coil at the ignition module harness connector?
Was the voltage equal to the specified value?
B+
Go to Step 12
Go to Step 11
11
Repair the open circuit.
—
Verify repair
—
12
1. Ignition OFF.
2. With DVM, check for an open in the ground wire at
the ignition module harness connector.
Was the ground wire OK?
—
Go to Step 14
Go to Step 13
13
Repair the faulty wire.
—
Verify repair
—
14
Replace the ignition module, verify the repair.
Attempt to start the engine.
Is there still a problem?
—
Go to Step 15
Verify repair
15
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to On–Vehicle Service in
Powertrain Control Module and Sensors for
procedures.
and also refer to latest service bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
—
Verify repair
—
16
Use an ohmmeter to check the ignition coil primary
winding resistance.
Was the primary winding resistance approximately
equal to the specified value?
0.8–18
W
Go to Step 17
Go to Step 18
17
Use an ohmmeter to check the ignition coil secondary
winding resistance.
Was the secondary winding resistance equal to the
specified value?
9,000–12,000
W
Go to Step 19
Go to Step 18
18
Replace the ignition coil.
—
Verify repair
—
19
Test the resistance of the coil–to–spark plug secondary
ignition wire.
Was the resistance greater than the specified value?
10,000
W
per
foot
Go to Step 20
Go to Step 21
6E1–85
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Engine Cranks But Will Not Run
(Cont'd)
Step
No
Yes
Value(s)
Action
20
Replace the coil–to–spark plug secondary ignition wire
and any other secondary wires which exceed the
specified value.
Is there still a problem?
10,000
W
per
foot
Go to Step 21
Verify repair
21
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
excessing fouling?
—
Correct the
fouling
condition
Go to Step 33
22
Verfiy repair.
Attempt to start the engine.
Is there still a problem?
—
Go to Step 23
Go to Step 22
23
1. Ignition OFF, install a fuel pressure gauge at the test
fitting on the fuel supply line in the engine
compartment.
CAUTION: Use a shop cloth to absorb any fuel
leakage while making the connection.
2. Check the engine and observe the fuel pressure.
Is the fuel pressure within the specified values, and
does it hold steady for 2 seconds?
285–375 kPa
(43–55 psi)
Go to Step 25
Go to Step 24
24
Is any fuel pressure indicated?
—
Go to Fuel
System
Electrical Test
Go to Fuel
System
Diagnosis
25
1. Install switch box J 39021–2 and J 39021–90 at the
injector test connector.
2. Activate an injector.
Did the fuel pressure drop when the injector was
activated?
—
Go to Step 26
Go to Fuel
System
Diagnosis
26
Pressurize the fuel system using the ignition ON and
use the injector switch box to test pressure drop for
each injector.
Was there a pressure drop when each injector was
activated?
—
Go to Step 27
Go to Fuel
System
Diagnosis
27
1. Remove the switch box and install an injector test
light J 39021–45 at the injector test harness
connector.
2. Crank the engine.
Are any of the lights blinking when the engine is
cranked?
—
Go to Step 33
Go to Step 28
28
1. Raise the vehicle and disconnect the CKP sensor
harness.
2. Ignition ON.
3. With a test light to ground, probe the CKP ignition
feed harness terminal.
Did the light illuminate?
—
Go to Step 29
Go to Step 30
6E1–86
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Engine Cranks But Will Not Run
(Cont'd)
Step
No
Yes
Value(s)
Action
29
1. Ignition ON.
2. At the CKP harness connector, connect a test lamp
between the ignition and ground terminals.
Did the lamp illuminate?
—
Go to Step 31
Go to Step 32
30
Check the CKP High circuit between the sensor and the
PCM for a short to ground or open circuit.
Was a problem found?
—
Verify repair
Go to Step 33
31
Replace the CKP position sensor.
Is there still a problem?
—
Go to Step 34
—
32
Check the CKP Low circuit between the sensor and the
PCM for: an open circuit, a short to ground, or short to
voltage.
Was the problem found?
—
Verify repair
Go to Step 33
33
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to On–Vehicle Service in
Powertrain Control Module and Sensors for
procedures.
and also refer to latest service bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
—
Verify repair
—
34
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 35
35
To diagnose the following conditions, refer to Engine
Mechanical:
f
Slipped camshaft drive belt.
f
Leaking or sticky valves or rings.
f
Excessive valve deposits.
f
Loose or worn rocker arms.
f
Weak valve springs
f
Leaking head gasket.
Is the action complete?
—
Verify repair
—
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