FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
SERVICE MANUAL NUMBER 24
Page 5D-4
90-861327 OCTOBER 1999
•
When a test light is specified, a “low-power” test light must be used. DO NOT use a
high-wattage test light. While a particular brand of test light is not suggested, a sim-
ple test, as shown below, on any test light will ensure it to be safe for system circuit
testing. Connect an accurate ammeter (such as the high impedance digital multime-
ter) in series with the test light being tested, and power the test light ammeter circuit
with the vehicle battery.
b
a
c
a -
Test Light
b -
Battery
c -
Ammeter
IMPORTANT: If the ammeter indicates LESS than 3/10 amp. current flow (.3 A or 300
mA), the test light is SAFE to use.
If the ammeter indicates MORE than 3/10 amp. current flow (.3 A or 300 mA), the test
light is NOT SAFE to use.
NOTE: Using a test light with 100 mA or less rating may show a faint glow when test actually
states no light.
•
When using a DVOM to perform voltage measurements, turn the ignition OFF when
connecting the DVOM to the circuitry to be tested.
Index
