Circuit Description

WARNING: This page is about a different car, the 2002 Isuzu Trooper, 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.

Isuzu V6 electronic ignition systems use a coil-at-plug method of spark distribution. In this type of ignition system, the PCM triggers correct driver outside the Ignition Current Sense System (ICSS), which then triggers correct ignition coil based on the 58X signal received from Crankshaft Position (CKP) sensor. Spark plug connected to coil fires when ICSS opens ground circuit for appropriate coil's primary circuit. During cranking, PCM monitors CKP sensor 58X signal. CKP sensor signal is used to determine which cylinder will fire first. After CKP sensor 58X signal has been processed by the PCM, it will command all six injectors On to allow a priming shot of fuel for all cylinders. After priming, injectors are left Off during the next six 58X reference pulses from the CKP sensors. This allows each cylinder a chance to use fuel from priming shot during cranking. The ION sensor signal allows the PCM to operate fuel injectors sequentially based on camshaft position. If camshaft position signal is not present at start-up, PCM will begin sequential fuel delivery with a 1-in-6 chance that fuel delivery is correct. Engine will run without a ION sensor signal, but will set an appropriate DTC.