PDi 920 - Page 22

Basic Diagnostic Testing
Basic Diagnostic Testing
Voltage Drop Testing Con t 'd.. .
[3] Battery Power to Starter Solenoid ( + )
This test checks battery source
effieciency to the starter sole-
noid.
Set the rotary switch to Voltage.
l Establish the base voltage that
you will compare test voltage
against (see base voltage, Volt
Drop Test
[ 1 I)
l Connect the positive ( + ) lead to
the positive
( + 1 battery termi-
nal.
Connect the negative (-1 lead to
the positive
( + ) terminal on the
starter soleniod.
l Set the MinIMax feature on the
meter.
Disable the ignition so the en-
gine doesn't start; crank the
engine for 2-3 seconds.
The example shown has 2 con-
nectors and
1 wire. A voltage
drop of more than 0.3 volts would
Starter /
Solenold
indicate a poor circuit.
Clean and inspect the battery
cables and cable connections; test
Important: Repeat this test when
again.
the engine is thoroughly warmed
up. Heat expansion of metal
causes resistance to increase.
Voltage Drop Testing Con t 'd.. .
[4] Battery Power to Complete Starter Circuit ( + 1
This test checks battery power
efficiency to the starter through
the starter soleniod.
l Set the rotary switch to voltage.
l Establish the base voltage that
you will compare test voltage
against (see base voltage, Volt
Drop Test
[ 1 I).
l Connect the positive ( + ) lead to
the
( + ) battery terminal.
Connect the negative (-1 lead to
the positive
( + ) terminal on the
starter motor.
Red (+)
l Set the MinIMax on the meter.
l Disable the ignition so the en-
gine doesn't start; crank the
engine for
2-3 seconds.
The example shown has
4 con-
nectors, 2 wires and 2 solenoid
connections.
A voltage drop of
more than
0.8 volts would indi-
cate a poor circuit.
Clean and inspect the battery and
starter cables, soleniod and cable
connections; test again.
Note:
A &fectivestartersolenoidrnay cause
Important: Repeat this test when
an excessive voltage drop; check the
the engine is thoroughly warmed
cables and connections before re- up. Heat expansion of metal
placing the soleniod.
causes resistance to increase.