SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Rough, Unstable, or Incorrect Idle, Stalling Symptom (Continued)
1.
2.
•
Check for fuel in pressure regulator
vacuum hose.
If fuel is present, replace the fuel
pressure regulator assembly.
Refer to Fuel Metering System in
“Description and System Operation”
section.
11
3.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
11-16
Volts
Was a problem found?
Go to Step 12
1.
Check for intermittent opens or short
to grounds in the ECT sensor, MAP
sensor and TP sensor circuits. Also
check or throttle linkage sticking,
binding or worn.
12
2.
3.
An intermittent failure may not store
a DTC.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
Go to Step 13
1.
Check ECM grounds for being
clean, tight and in their proper loca-
tions.
2.
3.
Also check that battery cables and
ground straps are clean nd secure.
If a problem is found, repair as nec-
essary.
13
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 14
Go to Step 15
1.
Check fuel delivery system items
thatcancausetheenginetorunrich.
14
15
2. If a problem is found, repair as nec-
essary.
Was a problem found?
Go to OBD
System
Check
1.
Check fuel delivery system items
that can cause the engine to run
lean.
If a problem is found, repair as nec-
essary.
2.
Go to OBD
System
Check
Was a problem found?
-
Go to Step 16
1.
2.
3.
Check or proper alternator voltage
output.
The voltage should be between spe-
cified values.
If a problem is found, repair as nec-
essary.
16
Go to OBD
System
Check
11-16
Volts
Was a problem found?
Go to Step 17
Index
90-861326--1 MARCH 1999
Page 5D-25
| 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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