GxT Ferret 63 DIAGNOSTIC ENGINE ANALYZER - Manual (Page 27)

BASIC TEST
With a beep, the display will show:
Crank the engine with the ignition key on and the engine
intake manifold throttle held wide open. With automatic
suppression the ignition will be held off.
Data saving will not begin until cranking current is
sensed. While waiting for amps and primary TACH sig-
nals from cranking, the analyzer will show:
Once started, the display during the test will constantly
show:
A timed data gathering process begins here. It relies
upon a good electrical system and a steady cranking
speed to get consistent results. Holding the throttle wide
open ensures that the cylinders get a full charge of air to
compress. Over 80% throttle also puts many computer
controlled engines in a reduced fuel mode so less fuel
will be dumped into the exhaust during the test.
If the engine diesels during cranking, the test data may
not be reliable.
—— Continue test on next page ——
The graph shows the
results of the relative
compression test. The
cylinder with the high-
est relative compression
will have a 100% bar.
The weakest cylinder will
have the shortest bar.
STEP TWO
Crank ENGINE 8 Seconds
Hold THROTTLE Wide OPEN
RPM Bat 12.34
8 AMPS Not Cranking?
Crank ENGINE 8 Seconds
Hold THROTTLE Wide OPEN
TEST VARIATIONS
If previous use of the analyzer has verified that the igni-
tion can be suppressed and that the Spark Pickup is
working, the ignition will be suppressed immediately.
Otherwise when cranking begins the engine may run
momentarily for signal verification.
If a coil primary signal cannot be sensed the test will
abort. Check connections using HARD START and then
retry.
The operator may bypass starter current sensing for very
small or unusual engines, and start saving data immedi-
ately by pressing START.
Checks are done when cranking begins to verify that the
battery has enough voltage, and that the RPM is neither
too slow nor fast for reliable data measurements. Inter-
ruption displays indicate possible problem causes.
If during the test, the battery voltage falls below 9.6 volts
it is too low to continue and one of the following will be
shown:
The test will stop and the operator should check the bat-
tery-starting system.
no SPARK PICKUP Signal
no PRIMARY TACH pulses
Compression Test Aborted
RPM too high to test
TEST ABORTED
?Battery CONNECTIONS?
TEST ABORTED
?CABLES or STARTER?
TEST ABORTED
AMPS high, check STARTER
-25-
(COMPRESSION)
------------------------
ENGINE DATA REPORT
------------------------
====CRANKING HISTORY====
SEC RPM BATT AMPS
1 13.33 151
2 326 11.88 129
3 306 11.57 122
4 301 11.35 116
5 300 11.17 114
7 292 11.03 113
9 291 10.85 112
11 289 10.76 112
13 288 10.70 112
15 288 10.66 111
------------------------
CRANKING VOLTS 10.66
CRANKING AMPS 111
------------------------
CRANKING RPM 288
ALTERNATOR AMPS 38
------------------------
BATTERY CCA EST. 487
RECOVERY SECONDS 23
------------------------
==SPARK BURN ANALYSIS==
RPM IGEGY BATTERY
772 43 14.13
IN FIRING ORDER
MIN AVE MAX SLOPE
0.9 2.0 2.1 10
1.1 2.0 2.2 10
1.0 2.0 2.1 15
0.9 2.0 2.1 17
0 1 2 3 4 MS
BURN TIME RANGE
====IGNITION PRIMARY====
850 RPM BAT 14.01
OSC 2 IGEGY 43 DRVR 0.8V
847 RPM DWL 3.6MSEC
DWL 0.3 VARIES TMG 4.8
==== POWER BALANCE ====
ORDER START END %DROP
1 852 767 10
2
849 764 10
3 858 764 11
4 848 763 10
- 0% 10 20 30 +
% RPM DROP
=ELECTRONIC COMPRESSION=
ORDER AMPS %MAX %LOW
1 120 99 1
2 120 99 1
3 119 98 2
4 121 100 0
80 90 100%MAX
% OF PEAK AMPS CRANKING