Ignition Coils; Ignition Control - Isuzu 1999 RODEO Workshop Manual

6E2–502
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Ignition Coils

A separate coil-at-plug module is located at each spark
plug. The coil-at-plug module is attached to the engine
with two screws. It is installed directly to the spark plug by
an electrical contact inside a rubber boot. A three-way
connector provides 12-volt primary supply from the
15-amp ignition fuse, a ground-switching trigger line from
the PCM, and a ground.

Ignition Control

The ignition control (IC) spark timing is the PCM's method
of controlling the spark advance and the ignition dwell.
The IC spark advance and the ignition dwell are
calculated by the PCM using the following inputs:
f Engine speed.
f Crankshaft position (58X reference).
f Camshaft position (CMP) sensor.
f Engine coolant temperature (ECT) sensor.
f Throttle position (TP) sensor.
f Knock signal (knock sensor).
f Park/Neutral position (PRNDL input).
f Vehicle speed (vehicle speed sensor).
f PCM and ignition system supply voltage.
f The crankshaft positron (CKP) sensor sends the
PCM a 58X signal related to the exact position of the
crankshaft.
0013
f The camshaft position (CMP) sensor sends a signal
related to the position of the camshaft.
f The knock sensor tells the PCM if there is any
problem with pre-ignition or detonation.
information allows the PCM to retard timing, if
necessary.
0001
Based on these sensor signals and engine load
information, the PCM sends 5V to each ignition coil.
TS22909
This
TS24037