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06-31443-01
1. SPECIFICATION
Description Specification
Spark plugInternal resistance3 ~ 7 kΩ
Center electrode Iridium alloy
Ground electrode Platinum alloy
Electrode clearance 1.1 mm
Change interval 160,000 km
Ignition coilPrimary operating current7 ± 0.5A
Generated voltage
(primary/secondary)Max. 400 V / 5~20 kV
Ignition type Independent ignition type
Ignition sequence 1-3-4-2
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06-4
2. LAYOUT
Ignition Coil
Bolt
Spark Plug 1.
2.
3.
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06-51443-01
1. OVERVIEW
The ignition system is to supply high voltage generated from the ignition coil to the spark plug. The
G20DF engine is equipped with the independent type direct ignition system that the ignition coil is
installed in each cylinder.
The basic ignition timing in each cylinder is determined by the signals from camshaft position sensor and
crankshaft position sensor.
This ignition system controls the electronic ignition timing received from the engine ECU. To control the
ignition timing precisely, the ECU use the information below:
Engine load
Coolant temperature
Intake air temperature
Engine rpm
Camshaft position sensor (CPS)
Crankshaft position sensor (CKS) -
-
-
-
-
-
If the signal from the camshaft position sensor is not delivered to the engine ECU, the ignition coil and
fuel system cannot be operated.
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06-6
2. COMPONENTS
Ignition coil
Camshaft position
sensorKnock sensorInjector
Spark plug
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09-6
Item How to check DTC set value / Action
Output current
B terminal current
Rotor coil
resistance
L terminal voltage
3. INSPECTION
1) Alternator
Output Test ▶
Disconnect the cable connected to the B
terminal on the alternator. Connect one
end of the ammeter to the B terminal and
the other end to the cable connected to
the B terminal.
Measure the maximum output value.
(Maintain the engine speed between
2,500 and 3,000 rpm.)
(Turn the headlamp and all the electrical
switches on.) 1.
2.Pass: If the measured current
is 45 A or higher.
Fail: If the measured current is
less than 45 A.
Check the current of the B
terminal. -
-
-
Move the gear selector lever to the neutral
position.
Maintain the engine speed at 2,500 rpm
with the vehicle unloaded.
(Turn all the electrical switches off.) 1.
2.Open circuit: If the measured
current is 5 A or higher. -
Disconnect the negative cable from the
battery.
Remove the B terminal and turn off the
ignition switch.
Measure the resistance between the L
and F terminals with an ohmmeter. 1.
2.
3.Pass: If the measured
resistance is between 3 and
6Ω.
Faulty rotor coil or slip ring: If
the measured resistance is
less than 3Ω or greater than
6Ω. -
-
Connect the B terminal wiring.
Measure the voltage with the engine
running. 1.
2.
Specification: 12.5V to 14.5V
Faulty IC regulator or field
coil: If the measured voltage
is 14.5V or higher. -
-
Disconnect the negative cable from the battery.
Connect the negative cable again after connecting the ammeter. -
-
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09-71452-01
Troubleshooting ▶
Item Cause Action
Overcharged batteryDefective alternator voltage regulator Replace
Defective voltage detection wiring Repair or replace
Discharged batteryLoose alternator drive belt
just the belt tension or
replace
Poor connection of related circuit or open
circuitRetighten the loose
connection or repair
open circuit
Defective alternator voltage regulator Replace
Terminated battery Replace
Defective ground Repair
Charge warning lamp does
not come on when turning on
ignition switch with engine
stoppedDefective alternator voltage regulator Replace
Open circuit in charge warning lamp, fuse
or wiringReplace or repair the
charge warning lamp or
fuse
Defective ignition switch Replace
Defective ground of alternator circuit Repair
Charge warning lamp does
not go off after starting
engineDefective alternator voltage regulator Replace
Corroded or worn battery cable Repair or replace
Loose alternator drive belt
Adjust the belt tension or
replace the belt
Defective wiring harness Repair or replace
Page 447 of 1082
09-111452-01
Maintenance ▶
If the charge warning lamp ( ) on the instrument cluster comes on while driving, there is a malfunction
in the charge system including the battery. Therefore, carrying out the system check is needed.
Make sure that the battery cables are firmly connected.
If the terminals are corroded, clean them with a wire brush or sandpapers.
Always disconnect the battery cables with the ignition key removed. When disconnecting the battery
cables with the ignition key turned to ON or ACC position, several electric units can be damaged due
to sudden voltage change.
Check the battery for crack, damage or fluid leaks. Replace it if necessary.
Wipe out the battery fluid on the battery surface using a rubber glove and a clean cloth wetted with
soapy water. -
-
-
-
-
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11-51462-01
3. TROUBLESHOOTING
Problem Possible Cause Action
Engine will not
crankLow battery voltage Charge or replace
Loose, corroded or damaged battery cable
Repair or replace
Faulty starter or open circuit
Faulty ignition switch or blown fuse Repair or replace
Poor engine ground Repair
Engine cranks
too slowLow battery voltage Charge or replace
Loose, corroded or damaged battery cable
Repair or replace
Faulty starter
Starter does not
stopFaulty starter Repair or replace
Faulty ignition switch Replace
Engine cranks
normally, but
does not startBroken pinion gear or faulty starter Replace the starter
Broken flywheel ring gear Replace
Open circuit Repair