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Electronic Ignition Components
The electronic ignition (EI) system for the 3.4L SHO engine consists of the following components:
Crankshaft Position (CKP) Sensor
Note: Initial engine ignition timing is set at 10 ± 2 degrees BTDC and is not adjustable.
The crankshaft position sensor (CKP sensor) is a variable reluctance sensor, which is triggered by a 36-minus-1 tooth trigger pulse wheel located inside the engine front cover. The sine wave type signal generated from the crankshaft position sensor provides two types of information:
Camshaft Position (CMP) Sensor
The camshaft position sensor (CMP sensor):
The powertrain control module uses the camshaft position (CMP)
signal for ignition coil fire sequencing. The powertrain control
module also uses the CMP signal for fuel injector
Coil Per Plug Unit
The 3.4L SHO engine uses eight separate coil per plug units. Each coil per plug unit is controlled by the powertrain control module (PCM).
Each coil per plug unit is mounted directly above each spark plug and activates its own spark plug in the proper sequence as controlled by the powertrain control module.
Failure Mode Effects Management
During some electronic ignition system concerns, the failure mode effects management portion of the powertrain control module (PCM) will maintain vehicle operation:
Ignition Diagnostic Monitor
The ignition diagnostic monitor is a function of the powertrain control module (PCM). The powertrain control module stores the information for use during diagnostic test mode.