Section 07 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
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There is no Voltage
If 12 V is NOT read, disconnect VCM connector 7
and check continuity of circuit.
IGNITION COIL
CONNECTOR
VCM
CONNECTOR
RESISTANCE
@20°C(68°F)
Pin 2 7-E
Close to 0
2
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If wiring/connector is defective, repair/replace. If
wiring/connectors are good, try a new VCM.
There is 12 V
If 12 V is read, verify the ECM ignition ground
circuit. Refer to ENGINE CONTROL MODULE
(ECM) below.
ENGINE CONTROL MODULE
(ECM)
Verify the ECM ignition ground circuit as follows:
Resistance Test
NOTE: For this test, use the ECM adapter
(P/N 420 277 010) to probe ECM connector.
Refer to ENGINE MANAGEMENT for more infor-
mation.
420277010
COMPONENT
IGNITION
COIL
CONNECTOR
ECM
CONNECTOR
RESISTANCE
@20°C(68°F)
Cylinder 1
(MAG)
Pin 1 A–41
Cylinder 2
(PTO)
Pin 3 A-1
Close to 0
If wiring/connector is defective, repair/replace. If
wiring/connectors are good, try a new ECM.
SPARK PLUGS
Disassembly
First unscrew the spark plug one turn.
Clean the spark plug and cylinder head with pres-
surize air then completely unscrew.
Heat Range
The proper heat range of the spark plugs is deter-
mined by the spark plugs ability to dissipate the
heat generated by combustion.
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