1F-56 ENGINE CONTROLS
SSANGYONG Y158
Circuit Description
The Electronic Ignition (EI) system uses a waste spark
method of spark distribution. The Crankshaft Position
(CKP) sensor sends reference pulses to the Engine
Control Module (ECM). The ECM then triggers the EI
system ignition coils Once the ECM triggers the EI sys-
tem ignition coils both of the connected spark plugs fire
at the same time. One cylinder is on its compression
stroke at the same time that the other is on the exhaust
stroke, resulting in lower energy needed to fire the spark
plug in the cylinder on its exhaust stroke.
This leaves the remainder of the high voltage to be used
to fire the spark plug in the cylinder on its compression
stroke. Since the CKP sensor is in a fixed position, tim-
ing adjustments are not possible or needed.
Test Description
The number(s) below refer to specific step(s) on the
diagnostic table.
IGNITION SYSTEM CHECK (2.3L DOHC)
2. It is important to check for the presence of spark to
all of the cylinders to isolate the problem to either
EI system ignition coil inputs or output.
5. In checking the ECM outputs for the electronic park
timing signal, it recommended to use an oscillo-
scope to view the varying voltage signals. In mea-
suring these outputs with a voltmeter, intermittent
errors may occur that cannot be seen by a voltme-
ter.
6. After confirming ECM inputs for the electronic spark
timing to the EI system coil are OK, it can be deter-
mined that a faulty EI system ignition coil is at fault.
11. After confirming proper CKP sensor input to the ECM
and no wiring problems present, it can be de-
termined that the ECM is at fault.
20. If the wiring between the ignition coil and the Over
Voltage Protection Relay (OVPR) connector termi-
nal 8 is OK, the problem is in the OVPR circuit.
YAA1F930