Code 23: IAT Circuit (Scan)
(2 of 2)
•
•
IGNITION “ON.”
DOES SCAN TOOL DISPLAY IAT
TEMPERATURE OF LESS THAN –22°F (–30°C)
OR GREATER THAN 266°F (130°C).
YES
NO
CODE 23 IS INTERMITTENT, REFER TO
“DIAGNOSTIC AIDS” ON FACING PAGE.
TEMPERATURE LESS THAN –22°F (–30°C)
TEMPERATURE GREATER THAN 266°F (130°C).
1
•
•
•
•
•
3
•
•
•
•
IGNITION “OFF.”
IGNITION “OFF.”
DISCONNECT IAT SENSOR.
IGNITION “ON.”
SCAN TOOL SHOULD DISPLAY
TEMPERATURE LESS THAN –22°F (–30°C).
DOES IT?
DISCONNECT IAT SENSOR.
JUMPER HARNESS TERMINALS TOGETHER.
IGNITION “ON.”
SCAN TOOL SHOULD DISPLAY
TEMPERATURE GREATER THAN 266°F (130°C).
DOES IT?
NO
YES
NO
YES
2
•
•
IGNITION “OFF.”
JUMPER CKT 472 TO ENGINE
GROUND.
CKT 472 SHORTED TO
GROUND
FAULTY IAT
SENSOR.
FAULTY CONNECTION
OR
IAT SENSOR.
OR
FAULTY ECM.
•
•
IGNITION “ON.”
SCAN TOOL SHOULD
DISPLAY TEMPERATURE
GREATER THAN 266°F (130°C).
DOES IT?
YES
NO
OPEN SENSOR
GROUND CIRCUIT
FAULTY CONNECTION
OR
OPEN CKT 472
FAULTY CONNECTION
OR
FAULTY ECM.
FAULTY ECM.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-105
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you