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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