ENGINE CONTROL SYSTEM 3-40
OIL PRESSURE SWITCH
09940-44120 : Air pressure gauge
09821-00004 : Air pump Assy
09930-99320 : Digital tester
Tester range :
^ ^
^ ^
^ (Continuity)
(1) Remove oil pressure switch. (See page 3-50.)
(2) Connect the gauge and pump as shown.
(3) While applying pressure to oil pressure switch, check conti-
nuity.
Oil pressure switch function :
ECM MAIN RELAY
09930-99320 : Digital tester
Tester range :
^ ^
^ ^
^ (Continuity)
(1) Disconnect ECM main relay from wire.
(2) Check continuity between terminal 1 and 2 each time 12V
is applied. Connect positive (+) side to terminal 4, and nega-
tive (–) side to terminal 3.
ECM main relay function :
12 V power Continuity
Applied Yes
Not applied No
B
Be careful not to touch 12 V power supply wires to each
other or with other terminals.
Oil pressure
switch
ECM main relay
12V
1
2
4
3
z
r
Pressure
kPa (kg/cm
2
)
Continuity
Less than
70 – 130 (0.7 – 1.3)
Ye s
70 – 130 (0.7 – 1.3)
or over
No
z
r
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