SERVICE MANUAL NUMBER 23
GENERAL SYSTEM DIAGNOSTICS
MEFI 3 - ECM J-1 and J-2 Circuit/Symptom Chart
In the following J-1 and J-2 Circuit/Symptom Charts only those pins which are used by the
ECM are shown. Pin numbers not listed are not used.
The “B+” Symbol indicates a system voltage (battery).
IMPORTANT: The following conditions must be met before testing.
1.
2.
3.
Engine at operating temperature.
Ignition on or engine running.
Scan tool not connected.
J-1 Circuits
Circuit
Diag-
nostic
Trouble
Codes
DTC(s)
Normal Voltage
Pin
Func-
tion
(CKT)
Num-
ber
Wire
Color
Possible
Symptoms
Pin
Ignition
ON
Engine
Running
(#)
Injector
Driver
DK
BLU
Rough Idle, Lack Of Power,
Stalling
J1-1
J1-3
467
453
B+
B+
None
Ignition
Control
Ref.
RED/
BLK
0
(NOTE 5)
0
(NOTE 5)
None
Poor Performance
Low
ECM
Ground
0
(NOTE 5)
0
(NOTE 5)
J1-4
J1-5
J1-9
450
450
419
BLK
BLK
None
None
None
No Start
No Start
ECM
Ground
0
(NOTE 5)
0
(NOTE 5)
MIL
Lamp
BRN/
WHT
0
(NOTE 5)
0
(NOTE 5)
Lamp Inoperative
Ignition
Control
Signal
0
(NOTE 5)
Stall, Will Restart In Bypass
Mode, Lack Of Power
J1-10
423
WHT
1.2V
42
IAC “B”
Low
GRN/
WHT
Not
Usable
Not
Usable
J1-11
J1-12
443
442
None
None
Rough Unstable or Incorrect Idle
Rough Unstable or Incorrect Idle
IAC “A”
Low
BLU/
BLK
Not
Usable
Not
Usable
NOTE 1: Battery voltage for first two seconds, then 0 volts.
NOTE 2: Varies with temperature.
NOTE 3: Varies with manifold vacuum.
NOTE 4: Varies with throttle movement.
NOTE 5: Less than .5 volt (500 mV).
Index
90-861326--1
MARCH 1999
Page 5E-41
| 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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