TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5G-39
Code 14 (2 of 3): Engine Coolant Temperature (ECT) Sensor Circuit (Scan) -
Low Temperature Indicated
TEST DESCRIPTION:
Number(s) below refer to step number(s) on the diagnostic table.
Step 2. DTC 14 will set if signal voltage indicates a coolant temperature below -22°F
(-30°C).
Step 3. This test simulates a DTC 15. If the ECM recognizes the low voltage signal and
displays a high temperature, the ECM and wiring are OK.
STEP
ACTION VALUE YES NO
PROCEED TO
1
Was the “On-Board Diagnostic” (OBD) System
Check Performed?
– Step 2
Go to
OBD
System
Check
2 Ignition “ON”
-
°
Does the scan tool display a coolant tem-
perature less than the specified value?
-
(-30°C)
Step 3 Step 4
3 1. Ignition “OFF”.
2. Disconnect ECT harness connector.
3. Connect a jumper wire from harness ter-
minal “A” (CKT 814) to harness terminal “B”
(CKT 410).
266°F
(130°C)
4. Ignition “ON”, engine “OFF”.
Does scan tool display a coolant tempera-
ture above the specified value?
Step 6 Step 5
4
Trouble code 14 is intermittent. Locate and
repair intermittent faulty connections.
– –
5
Locate and repair open in CKT 410 or CKT
814. If a problem is found, repair as necessary.
Was a problem found?
–
Verify
Repair
Step 7
6 Repair faulty ECT sensor.
Is action complete?
– –
7
Repair faulty ECM connections or replace
faulty ECM.
Is action complete?
– –
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