Generac QT 5.4L 4L & 6.8L Ignition Description, ‹ Ignition POWER-UP Input 56 Line Input

Standby Generator Sets

Specifications

5.4L & 6.8L IGNITION DESCRIPTION NOTE:

This single-fire Ignition is intended to operate with

a10-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.

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

3.0seconds and then repeats

2.No CAM Signal: LED blinks 3 times, is OFF for

3.0seconds 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.

‹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.

6-3

11/05 C .Rev GenSpec007