the coil, boot, and fasteners is known as the ignition
coil assembly. The Powertrain Control Module (PCM)
determines which coil to charge and fire at the cor-
rect time.
OPERATION
The Auto Shutdown (ASD) relay provides battery
voltage to the ignition coil. The PCM provides a
ground contact (circuit) for energizing the coil. When
the PCM breaks the contact, the energy in the coil
primary transfers to the secondary causing the
spark. The PCM will de-energize the ASD relay if it
does not receive the crankshaft position sensor and
camshaft position sensor inputs. For limp home capa-
bility, the engine can run on crankshaft sensor input
only. Refer to Auto Shutdown (ASD) Relay—PCM
Output, in this section for relay operation.
The coil’s low primary resistance (0.4 - 0.6 ohm)
allows the PCM to fully charge the coil for each fir-
ing. There is a coil capacitor added to each bank of
cylinders for radio noise suppression.
CRANKSHAFT POSITION SENSOR
DESCRIPTION
The crankshaft sensor is located on the passengers
side of the transmission housing, above the differen-
tial housing (Fig. 6). The bottom of the sensor is posi-
tioned next to the drive plate.
Fig. 1 Platinum Pads
1 – APPLY ANTI-SEIZE COMPOUND HERE ONLY
2 – PLATINUM SPARK SURFACE
Fig. 2 2.7L Coil
Fig. 3 3.2/3.5L Coil
Fig. 4 Coil Capacitor
1 – IGNITION COIL CAPACITOR
8D - 2 IGNITION SYSTEM LH
DESCRIPTION AND OPERATION (Continued)
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