Mercury MerCruiser MIE 7.4L MPI User Manual

GENERAL SYSTEM DIAGNOSTICS SERVICE MANUAL NUMBER 23
Page 5E-100 90-861326--1 MARCH 1999
Discrete Input Circuit Check - Non-Scan 7.4L MPI Only (3 of 5)
TESTING GEAR LUBE MONITOR SWITCH
STEP
ACTION VALUE YES NO
PROCEED TO
1
1. Disconnect TAN/WHT wire from gear
lube monitor.
2. Empty gear lube from monitor.
3. Check for continuity between TAN/WHT
wire and ground (–).
Is there continuity? 0 Ohms Step 2 Step 3
2
1. Refill gear lube monitor.
2. Check for continuity between TAN/WHT
wire and ground (–).
Is there continuity? 0 Ohms Step 3 Step 4
3 Replace gear lube monitor. Verify repair. – –
4 Gear lube monitor switch is working properly. – –
TESTING TRANSMISSION TEMPERATURE SWITCH
STEP
ACTION VALUE YES NO
PROCEED TO
1
1. Disconnect both wires from transmission
temperature switch.
2. Ensure switch is at a cool temperature
(less than normal operating temperature).
3. Check for continuity between both termi-
nals.
Is there continuity? 0 Ohms Step 3 Step 2
2
1. Heat the switch to a temperature high
enough to activate it. (Refer to Section 4D of
this manual for procedure).
2. Check for continuity between both termi-
nals.
Is there continuity? 0 Ohms Step 4 Step 3
3
Replace transmission temperature switch.
Verify repair.
– –
4
Transmission temperature switch is working
properly.
– –
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Index

Mercury MerCruiser MIE 7.4L MPI Specifications

General

Brand	Mercury
Model	MerCruiser MIE 7.4L MPI
Category	Engine
Language	English