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.

The electronic ignition system uses a dual coil method of spark distribution. In this type of ignition system, PCM triggers the correct Ignition Control Module (ICM) driver, which triggers correct ignition coil based on 58X signal received from the Crankshaft Position Sensor (CKP). Spark plug connected to coil fires when ICM opens ground circuit for ignition coil's primary circuit. During cranking, PCM monitors CKP 58X signal. CKP signal is used to determine which cylinder will fire first. After CKP 58X signal has been processed by the PCM, it will command all four injectors to allow a priming shot of fuel for all cylinders. After priming, fuel injectors are left OFF during the next four 58X reference pulses from CKP. This allows each cylinder a chance to use fuel from priming shot. During this waiting period, a Camshaft Position (CMP) sensor signal pulse will have been received by PCM. CMP sensor signal allows 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-4 chance that fuel delivery is correct. Engine will run without a CMP sensor signal, but will set a DTC code.