GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
Discrete Input Circuit Check - Non-Scan 7.4L MPI Only (5 of 5)
TESTING FOR OPEN CIRCUITS
STEP
ACTION
VALUE
YES
NO
PROCEED TO
1.
Disconnect PUR wire from oil pressure
switch.
2.
Disconnect TAN/WHT wire from gear
lube monitor.
3. Disconnect BLU/TAN wire from transmis-
sion temperature switch (if equipped).
1
4.
5.
that was disconnected.
Key “ON”, engine “OFF”.
One at a time, touch each wire to ground
(–)
Does audio warning buzzer sound when
grounding PUR wire?
Step 3
Step 3
Step 3
Step 2
Step 2
Step 2
Does audio warning buzzer sound when
grounding TAN/WHT wire?
Does audio warning buzzer sound when
grounding BLU/TAN wire?
1.
2.
3. Check for continuity between all wires
disconnected in “Step 1” and terminal J1-4
(J1-6 on Later Models).
Key “OFF”.
Disconnect ECM J1 connector.
2
Is there continuity on PUR wire?
Is there continuity on TAN/WHT wire?
Is there continuity on BLU/TAN wire?
Circuit(s) is not open.
0 Ohms Step 3
Step 4
Step 4
Step 4
–
0 Ohms Step 3
0 Ohms Step 3
3
4
–
–
Repair open circuit.
–
NOTE: The ECM should only be replaced after all switches and circuits have been tested
and found to be functioning properly.
Index
Page 5E-102
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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