SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Hard Start Symptom (Continued)
1.
2.
Check for a ECT sensor shifted in
value.
With engine completely cool, mea-
sure the resistance of the ECT sen-
sor.
3.
Refer to the Engine Coolant Tem-
perature Sensor Temperature -vs-
Resistance value table on the facing
page of DTC 14 in the “Trouble Code
Diagnostics” section. Compare the
approximate temperature of the
ECT sensor to an accurate reading
of ambient air temperature.
9
Are the readings within the specified 10° F
Go to Step
14
value?
(-12° C)
Go to Step 13
1.
Check ECT sensor for being shifted
in value.
2.
With the engine completely cool,
compare the ECT sensor tempera-
ture with an accurate reading of
ambient air temperature.
10
Are
specified value of each other?
the
temperatures
within
the
10° F
(-12° C)
Go to Step
11
Go to Step 13
1.
Using a scan tool, display ECT sen-
sor temperature and note value.
Check resistance of ECT sensor.
Go to Engine Coolant Temperature
Sensor Temperature -vs- Resis-
tance value table on the facing page
of DTC 14 in the Diagnostics sec-
tion.
2.
3.
11
Is resistance value of ECT sensor near
the resistance of the value noted?
Go to Step
14
-
Go to Step 12
Locate and repair high resistance or
poor connection in the ECT signal
circuit or the ECT sensor ground.
Is action complete?
Go to OBD
System
Check
12
13
-
-
-
-
Replace the ECT sensor.
Is action complete?
Go to OBD
System
Check
1.
2.
Check for intermittent opens or
shorts to ground in the MAP sensor
circuits.
If a problem is found, repair as nec-
essary.
14
Go to OBD
System
Check
Was a problem found?
-
Go to Step 15
Index
90-861326--1 MARCH 1999
Page 5D-9
| 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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