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ELECTRICAL SYSTEM 16-125
Relay Box
Relay Circuit Inspection (with the battery connected)
Battery
Connection
(+) (–)
Tes ter
Connection
Tes ter
Reading (Ω)
2-11 1-3 0
ECU Main Relay
4-5 7-6 0
Fuel Pump Relay 9-10 7-8 0
Fan Relay 18-19 17-20 0
Battery
Connection
(+) (–)
Tester Connection
DC 25 V Range
(+) (–)
Tes ter
Reading (V)
Starter
Circuit Relay
16-12 11-12
Battery
Voltage
(+): Apply positive lead.
(–): Apply negative lead.
Diode Circuit Inspection
•
Remove the relay box (see Relay Box Removal).
•
Check conductivity of the following pairs of terminals (see
Relay Box Internal Circuit in this section).
Diode Circuit Inspection
Tester Connection
1-11, 2-11, 12-13, 12-15, 12-16, 13-14,
13-15
The resistance should be low in one direction and more
than ten times as much in the other direction. If any diode
shows low or high in both directions, the diode is defective
and the relay box must be replaced.
NOTE
○
The actual meter reading varies with the meter or tester
used and the individual diodes, but generally speaking,
the lower reading should be from zero to one half the
scale.
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