SERVICE MANUAL NUMBER 23TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
Page 5F-22 90-861326--1 MARCH 1999
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
1
Was the “On-Board Diagnostic” (OBD) System
Check Performed?
– Step 2
Go to
OBD
System
Check
1. Ignition ON.
Does scan tool dis
la
a coolant tem
era-
–
p
p
ture value greater than 266
°
F (130
°
C) or
less than -22
°
F (-30
°
C)?
–
3
Does scan tool display a coolant tempera-
ture value greater
than 266
°
F (130
°
C)?
– Step 6 –
4
Does scan tool display a coolant tempera-
ture value less
than -22
°
F (-30
°
C)?
– Step 7 –
5
Code 14 is intermittent. If no additional codes
were stored, refer to “Diagnostic Aids.”
– – –
1. Ignition OFF.
2. Disconnect engine coolant temperature
(ECT) sensor.
3. Ignition ON.
4. Scan tool should display coolant tempera-
°
°
–
p
p
-
-
.
Does it?
–
1. Ignition OFF.
2. Disconnect coolant temperature sensor.
3. Jumper terminals “A” and “B” together.
4. Ignition ON.
5. Scan tool should display coolant tempera-
°
°
–
p
p
.
Does it?
–
8
Check for CKT 410 shorted to ground or faulty
ECM.
– – –
9 Replace engine coolant temperature sensor. – – –
10
Check CKT 410 open, sensor ground open, or
faulty ECM.
– – –
11 Replace engine coolant temperature sensor. – – –
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