SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
Code 23 (2 of 3): Intake Air Temperature (IAT) Sensor Circuit (Scan) - Low
Temperature Indicated
STEP
ACTION
VALUE
YES
NO
PROCEED TO
Trouble code 23 is intermittent. Locate and re-
pair intermittent faulty connections.
4
5
–
–
–
Locate and repair open in CKT 472 or CKT
813. If a problem is found, repair as necessary.
Was a problem found?
Step 7
Verify
Repair
6
7
Repair faulty IAT sensor. Is action complete?
–
–
–
–
Repair faulty ECM connections or replace
faulty ECM. Is action complete?
INTAKE AIR TEMPERATURE SENSOR CHART
IAT Sensor
Temperature - to - Resistance Values (Approximate)
°
F
°C
OHMS
210
160
100
70
40
20
100
70
38
20
4
-7
-18
-40
185
450
1,800
3,400
7,500
13,500
25,000
100,700
0
-40
90-861326--1
MARCH 1999
Page 5G-49
| 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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