Generac QT 5.4L - Manual (Page 12)

5.4L & 6.8L IGNITION DESCRIPTION
This single-fire Ignition is intended to operate with
a 10-cylinder, 6.8L engine and an 8-cylinder, 5.4L
engine.
The 6.8L engine uses a 40-1 crank sensor, a mag-
pickup CAM sensor and individual coil-on-plug coils
for each spark-plug.
The 5.4L engine uses a 36-1 crank sensor, a mag-
pick-up CAM sensor and individual coil-on-plug coils
for each spark-plug.
With a single-fire ignition, each high-voltage coil out-
put is connected to one spark plug resulting in that
spark plug being fired only during the compression
cycle.
Engine Timing versus Engine Speed for the 6.8L
engine is:
RPM NG/LP Engine Timing (BTDC)
1800 rpm 22 degrees
3600 rpm 24 degrees
Engine Timing versus Engine Speed for the 5.4L
engine is:
RPM NG/LP Engine Timing (BTDC)
1800 rpm 26 degrees
3600 rpm 26 degrees
IGNITION POWER-UP INPUT ("56 LINE
INPUT")
When battery voltage is applied to this input the igni-
tion will power-up. For the ignition to power itself
down, battery voltage must be removed from this
input.
IGNITION ENABLE ("14 LINE INPUT")
This input must be connected to the +12V battery for
the ignition to turn-on the coils. If this input is con-
nected to battery ground the ignition will stop firing
the coils and will power down within approximately
2 seconds. In the event that an ignition fault has
occurred, however, the ignition will wait 60 seconds
before powering down. This allows time to view the
diagnostic LED located on the ignition board.
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NOTE:
The ignition cover does not need to be removed to
see the LED.
IGNITION SHUTDOWN ON LOSS OF CRANK
OR CAM SIGNALS
The ignition will stop firing the coils immediately fol-
lowing the loss of the crank signal. The ignition will
stop firing the coils after approx. 3 seconds following
the loss of the cam signal.
DIAGNOSTIC BLINK PATTERNS (RED LED
LOCATED ON THE IGNITION CONTROL
BOARD)
During normal ignition operation the RED LED
flashes at a 0.5 sec ON and a 0.5 sec OFF rate. This
is considered one (1) blink.
LED Fault Code with Priority as shown:
1. No Crank Signal: LED blinks 2 times, is OFF for
3.0 seconds and then repeats
2. No CAM Signal: LED blinks 3 times, is OFF for
3.0 seconds and then repeats
Only one fault is displayed at a time. If multiple faults
exist then the highest priority fault must be resolved
prior to a lower priority fault being displayed. In the
event that an ignition fault has occurred the ignition
will wait 60 seconds before powering down.
NOTE:
The ignition cover does not need to be removed to
see the LED.
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6-3
Standby Generator Sets
Specifications
GenSpec007 Rev. C 11/05