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4-1
Section
2
4
Section
More Uses for the
Ignition Module
&
Engine Sensor Tester
Circuit Voltage Checks
This function is useful for checking the presence (or absence) of voltages
throughout the vehicle electrical system (such as wiring, switches, relays, and
connectors). It is safe for probing computer and sensor circuits.
Warning: Observe all safety precautions when working on vehicles (see page ii).
1) Set FUNCTION switch to VOLTS.
2) Set RANGE switch to HIGH.
3) Connect BLACK test lead to circuit ground.
4) Probe with YELLOW test lead.
Warning: Do not connect to secondary ignition
circuits - dangerous voltages present!
5) TEST light position indicates measured voltage.
Each light represents a 0.5 volt step along a
span of 0.5 to 5 volts.
• Top TEST light ON - voltage is 5 volts, or
higher.
• Other TEST lights ON - see illustration for
voltage level.
• All TEST lights OFF - voltage is less than 0.5
volts, not present or negative polarity.
Important:
• Always make sure all connections are good at
the contact points.
• Negative voltages, no matter how large, will
NOT turn on TEST lights.
• More than one TEST light on, or jumping
around, means the measured voltage is
erratic or rapidly changing.
RANGE
HIGH
LOW
POWER OFF
FUNCTION
VOLTS
OHMS
FREQUENCY
TEST
VOLTS
over5
4.5
4
3.5
3
2.5
2
1.5
1
.5