SERVICE MANUAL NUMBER 23
GENERAL SYSTEM DIAGNOSTICS
Discrete Input Circuit Check - Non-Scan 7.4L MPI Only (4 of 5)
TESTING CIRCUITS FOR SHORT-TO-GROUND (–)
STEP
ACTION
VALUE
YES
NO
PROCEED TO
1.
Disconnect PUR wire from oil pressure
switch.
2.
Disconnect TAN/WHT wire from gear
1
lube monitor.
3.
Disconnect BLU/TAN wire from transmis-
sion temperature switch (if equipped).
4.
Key “ON”, engine “OFF”.
Does audio warning buzzer sound?
Step 2
Step 3
1.
2.
3.
Key “OFF”.
Disconnect ECM J1 connector.
Check for continuity between all wires
2
disconnected in “Step 1” and engine ground (–).
Is there continuity on PUR wire?
0 Ohms Step 4
Step 3
Step 3
Step 3
–
Is there continuity on TAN/WHT wire?
Is there continuity on BLU/TAN wire?
Circuit(s) is not shorted to ground (–).
Repair short-to-ground (–) in affected circuit.
0 Ohms Step 4
0 Ohms Step 4
3
4
–
–
–
Index
90-861326--1
MARCH 1999
Page 5E-101
| 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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