SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
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
Go to
Was the “On-Board Diagnostic” (OBD) System
Check Performed?
OBD
System
Check
1
2
–
Step 2
Ignition “ON”
-
22°F
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.
minal “A” (CKT 814) to harness terminal “B”
(CKT 410).
Connect a jumper wire from harness ter-
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
–
Trouble code 14 is intermittent. Locate and
repair intermittent faulty connections.
4
5
–
–
Locate and repair open in CKT 410 or CKT
814. If a problem is found, repair as necessary.
Was a problem found?
Step 7
Verify
Repair
6
7
Repair faulty ECT sensor. Is action complete?
–
–
–
–
Repair faulty ECM connections or replace
faulty ECM. Is action complete?
90-861326--1
MARCH 1999
Page 5G-39
| 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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