TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
Page 5G-8
90-861326--1 MARCH 1999
Code 15 (3 of 3): Engine Coolant Temperature (ECT) Sensor Circuit
(Non-Scan) High Temperature Indicated
STEP
ACTION
VALUE
YES
NO
PROCEED TO
3
Locate and repair intermittent faulty connec-
tions. If OK, replace faulty ECT sensor.
–
–
4
Locate and repair short to ground in CKT 410.
If a problem is found, repair as necessary.
Was
a problem found?
–
Verify
Repair
Step 5
5
Repair faulty ECM connections or replace
faulty ECM.
Is action complete?
–
–
ENGINE COOLANT TEMPERATURE SENSOR CHART
ECT Sensor
Temperature - to - Resistance Values (Approximate)
°
F
°
C
OHMS
210
160
100
70
40
20
0
-40
100
70
38
20
4
-7
-18
-40
185
450
1,800
3,400
7,500
13,500
25,000
100,700
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