GxT Ferret 63 DIAGNOSTIC ENGINE ANALYZER - Manual (Page 10)

METER PROCEDURE
"DIODE" voltage in the forward and reverse directions
can also be read by changing the test with SELECT.
Note that resistance is measured by applying the carʼs
battery voltage through a 1000 ohm resistor in the ana-
lyzer, so that up to 15 milliamps may pass through the
tested device. An advantage of this current is that LEDs
can be checked for light output, and diode forward and
reverse voltages can be checked at a more normal op-
erating level.
1
OPEN
2
GROUND
3
MEASURE
TO
GROUND
“SENSOR TEST” KEY
Use SELECT and START to choose tests for measuring
ohms or diode volts, measuring oxygen
sensor voltage and crossings, checking
for irregular throttle position sensors
(TPS), watching for intermittent voltage
with the Wiggle Scope, and reading fault
SENSOR
TEST
02 TPS
SETUP AMP ZERO SELECT MESSAGE
PRINT
DISPLAY
PRINT
AUTOTEST
CHARGING
STARTING
AMPS VOLTS
IGNITION
PRIMARY
COIL MODULE
DWELL VARIATION
AUXILIARY AUXILIARY PER CYLINDER
CRANKING
ANALYSIS
COMPRESSION
BAT. STARTER ALT.
POWER
BALANCE
% RPM DROP
AUTO MANUAL
PER CYLINDER
SPARK
BURN
SECONDARY
MSEC SLOPE
PER CYLINDER
HARD
START
IGNITION VOLTS
AUXILIARY
FUEL
INJECTION
MSEC, % DUTY, HZ
AUXILIARY
START
PAPER
ADVANCE
OHMS RESISTANCE / DIODE VOLTS
The resistance of a device is measured by connecting
the red Auxiliary Clip to one of the deviceʼs terminals and
contacting the other device terminal to the battery/engine
ground. A continuity beeper sounds when readings are
below 25 ohms, and “OVER” shows for greater than 50K
ohms. (Ground = chassis)
Prior to using ohms the analyzer must do an open/ground
lead test which checks the low and high range ends.
STEP 1: Infinite resistance is checked.
STEP 2: Ground zero calibration is done.
Responses are given to guide the calibration process. If
the carʼs battery voltage drifts during the test the calibra-
tion may also drift. Press START to redo the recalibra-
tion procedure.
STEP 3: Read resistance to ground.
OHM-
SELECT: OHMS to GROUND
TEST then START
Disconnect AUX lead
then START
Connect AUX to GND
then START
OHMS to GND Bat 12.45
OHMS 0
OXYGEN LAMBDA SENSOR
The red Auxiliary Clip has a 10 megohm input for this
test. The display shows the average sensor output volt-
age, the number of times the voltage crosses the 0.45
level per second, and whether the immediate voltage
indicates rich or lean by the R/L display.
Typical cross count readings for warm engines running at
Oxygen Sensor 0.83 v
0.0 Crossings/Sec R/L
flash codes from Ford and GM engine control computers.
The red Auxiliary Clip is the signal input.
a steady fast idle are in the 1 to 3 range. Low rates may
indicate a damaged O2 sensor. Multiports usually cross
count fastest and carbureted engines the slowest.
Connect at sensor harness plug or ECM. Do not pen-
etrate wire insulation where moisture could cause electri-
cal leakage to ground.
-8-
OHMS to GND Bat 12.45
DIODE 12.45v