Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 235
6D2–2
IGNITION SYSTEM (6VE1 3.5L)
General Description
Ignition is done by the electronic ignition (El) that directly
fires the spark plugs from ignition coils through spark plug
wires without using a distributor. The firing orders are
selected No.1, No.2, No.3, No.4, No.5, and No6.
Since the cylinder on exhaust stroke requires less energy
to fire its ignition plug, energy from the ignition coils can be
utilized to fire the mating cylinder on compression stroke.
After additional 360
°
rotation, respective cylinder strokes
are reversed.
The EI consists of six ignition coils,ignition control
module, crank position sensor, powertrain control module
(PCM) and other components.
The ignition coils are connected with the PCM by means
of a 80 pin connector.
The ignition control module turns on/off the primary circuit
of ignition coils, and also it controls the ignition timing at
the engine speed below 538 rpm.
A notch in the timing disc on the crankshaft activates the
crank position sensor which then sends information such
as firing order and starting timing of each ignition coil to
the PCM.
Further, the El employs ignition control (IC) to control
similar to a distributor system.
By receiving signals such as crank position,engine
speed, water temperature and Manifold Absolute
Pressure (MAP), the PCM controls the ignition timing.
D06RY00037
Diagnosis
Refer to Section Drivability and Emissions for the
diagnosis to electronic ignition system (El system).
6D2–3
IGNITION SYSTEM (6VE1 3.5L)
Ignition Coil
Removal
1. Disconnect battery ground cable.
2. Ignition coil connector and ignition coil.
D
Disconnect three connector from ignition coil.
D
Remove harness bracket bolt on cylinder head
cover.
D
Remove fixing bolts on ignition coil.
060RY023
Legend
(1) Ignition Coil Connector
(2) Bolt
(3) Ignition Coil Assembly
Inspection and Repair
Check the ignition coil assembly for insulation. Check
terminals for corrosion or damage, and replace as
necessary.
Measuring resistance of ignition coil assembly.
Terminal No.
Limit
1 to 2
Without 0 ohm or infinity
maximum ohm.
1 to 3
Same as above
2 to 3
Same as above
Measure resistance of ignition coil assembly, and replace
the ignition coil assembly if its value exceeds the
standard.
060RW006
Installation
1. Install the ignition coil assembly (3).
Connect ignition coil connector (1) and ignition coil
(3), then tighten bolt (2) to the specified torque.
Torque: 4 N·m (35 lb in)
060RY023
6D2–4
IGNITION SYSTEM (6VE1 3.5L)
CAUTION: Ignition coil assembly #6 is different
from ignition coil assembly from #1 to #5. Ignition
coil assembly #6 is short type. So, note it when
installing ignition coil assembly of #6.
060RY00002
Legend
(1) Long type Ignition Coil Assemblies (#1
∼
#5)
(2) Short type Ignition Coil Assembly (#6)
2. Connect battery ground cable.
6D2–5
IGNITION SYSTEM (6VE1 3.5L)
Spark Plug
Removal
1. Remove spark plugs.
Inspection and Repair
The spark plug affects entire engine performance and
therefore its inspection is very important.
D
Check electrode and insulator for presence of cracks,
and replace if any.
D
Check electrode for wear, and replace if necessary.
D
Check gasket for damage, and replace if necessary.
D
Measure insulation resistance with an ohmmeter, and
replace if faulty.
D
Adjust spark plug gap to 1.0 mm – 1.1 mm (0.0394 in –
0.0433 in).
011RS011
NOTE:
– Do not adjust the spark plugs gap without new
spark plugs.
– Do not damage to tip of spark plugs.
– Do not cleaning the spark plugs. If require the
cleaning it due to heavy dirt, it is allowed only 20
seconds to be used spark plug cleaner.
D
Check fuel and electrical systems if spark plug is
extremely dirty.
D
Use spark plugs having low heat value (hot type plug)
if fuel and electrical systems are normal.
D
Use spark plugs having high heat value (cold type
plug) if insulator and electrode are extremely burned.
Sooty Spark Plugs
Much deposit of carbon or oil on the electrode and
insulator of spark plug reduces the engine performance.
Possible causes:
D
Too rich mixture
D
Presence of oil in combustion chamber
D
Incorrectly adjusted spark plug gap
Burning Electrodes
This fault is characterized by scorched or heavily oxidized
electrode or blistered insulator nose.
Possible causes:
D
Too lean mixture
D
Improper heat value
Measuring Insulation Resistance
D
Measure insulation resistance using a 500 volt
megaohm meter.
D
Replace spark plugs if measured value is out of
standard.
Insulation resistance: 50 M
W
or more
011RS010
Installation
1. Spark plugs
D
Tighten spark plugs to the specified torque.
Torque: 18 N·m (13 lb ft)
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