TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
SERVICE MANUAL NUMBER 23
Code 14 (2 of 2): Engine Coolant Temperature (ECT) Sensor Circuit (Scan)
Number(s) below refer to step number(s) on the diagnostic table.
Step 2. Code 14 will set if:
•
•
Signal voltage indicates a coolant temperature above 266°F (130°C).
Signal voltage indicates a coolant temperature below -22°F (-30°C).
Step 6. This test will determine if CKT 410 is shorted to ground, which will cause the condi-
tion for Code 14.
STEP
ACTION
VALUE
YES
NO
PROCEED TO
Go to
Was the “On-Board Diagnostic” (OBD) System
Check Performed?
OBD
System
1
–
Step 2
Check
1.
Ignition ON.
Does scan tool display a coolant tempera-
ture value greater than 266° F (130° C) or
less than -22° F (-30° C)?
2
–
Step 3
Step 5
Does scan tool display a coolant tempera-
ture value greater than 266° F (130° C)?
3
4
5
–
–
–
Step 6
Step 7
–
–
–
–
Does scan tool display a coolant tempera-
ture value less than -22° F (-30° C)?
Code 14 is intermittent. If no additional codes
were stored, refer to “Diagnostic Aids.”
1.
Ignition OFF.
2.
Disconnect engine coolant temperature
(ECT) sensor.
6
7
3.
Ignition ON.
4.
Scan tool should display coolant tempera-
ture below -22° F (-30° C).
Does it?
–
Step 9
Step 8
1.
2.
3.
4.
5.
Ignition OFF.
Disconnect coolant temperature sensor.
Jumper terminals “A” and “B” together.
Ignition ON.
Scan tool should display coolant tempera-
ture above 266° F (130° C).
–
Step 11 Step 10
Does it?
Check for CKT 410 shorted to ground or faulty
ECM.
8
9
–
–
–
–
–
–
–
–
–
–
–
–
Replace engine coolant temperature sensor.
Check CKT 410 open, sensor ground open, or
faulty ECM.
10
11
Replace engine coolant temperature sensor.
Index
Page 5F-22
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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