72 Electrical System and Sensor Troubleshooting TP-6903 5/16a
4.8. Ignition Coil Troubleshooting
Figure 4-17 Ignition Coil
WARNING
Electrical shock can cause injury.
Do not touch wires while engine is running.
WARNING
Risk of Fire. Can cause severe injury or death.
Do not smoke or permit flames or sparks near fuels or the
fuel system.
Troubleshooting and/or repairing the sensors or the
ECM. A backfire due to an open fuel shut-off valve can
cause severe injury or death. If power is supplied to the
shut-off valve during ECM or sensor troubleshooting, fuel
may enter the air intake manifold or the air cleaner and
cause a backfire. Make sure that the fuel supply is turned
OFF and that the fuel shut-off valves are
DISCONNECTED from the power source BEFORE
turning the ECM power on.
WARNING
Rotating parts can cause severe injury.
Stay away while the engine is in operation.
Keep hands, feet, hair, and clothing away from all moving
parts to prevent injury. Never operate the engine with
covers, shrouds, or guards removed.
Figure 4-18 Ignition Coil Wiring Diagram
Refer to Figure 4-18 and follow the steps in the
troubleshooting chart to verify that:
The ignition coil is working correctly and is not
damaged.
The ignition coil leads have continuity (no
open circuits).
The ignition coil leads are not shorted.
Power is being provided to the ignition coil.
P27-117, Cylinder 2
Ignition
coil
Power from
the controller
P27-116, Cylinder 1
1
2
70J
116
70F
3
4
117
ECM
P26-65, Power
70E
70G
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