Code 43: KS Circuit (Scan)
(2 of 2)
1
•
•
INSTALL SCAN TOOL.
ENGINE IDLING, COOLANT TEMP. ABOVE 150°F (66°C).
DOES SCAN TOOL INDICATE A FIXED VALUE GREATER
THAN ZERO DEGREES OF KNOCK RETARD?
YES
NO
2
•
•
•
•
•
•
RECONNECT 5 WAY KS MODULE CONNECTOR.
DISCONNECT KNOCK SENSOR HARNESS CONNECTOR.
CONNECT A TEST LIGHT TO BATTERY POSITIVE (B+).
START ENGINE.
HOLD ENGINE SPEED STEADY AT 2500 RPM.
RAPIDLY TOUCH TEST LIGHT TO KNOCK SENSOR HARNESS
CONNECTOR TERMINAL (CKT 496).
CHECK FOR OPEN OR SHORT
IN CKT 496.
IF OK, REPLACE KNOCK
SENSOR.
•
DOES A NOTICEABLE RPM DROP OCCUR OR USING TIMING LIGHT,
DID TIMING DROP ?
NO
YES
3
•
•
•
•
IGNITION “OFF.”
DISCONNECT ECM CONNECTOR J-2
IGNITION “ON.”
CONNECT DVOM FROM ECM HARNESS
CONNECTOR TERMINAL “C” (CKT 485) TO
GROUND.
INSPECT KNOCK SENSOR TERMINAL
CONTACTS. IF OK, REPLACE KNOCK
SENSOR.
ARE 8-10 VOLTS PRESENT?
YES
NO
5
6
•
•
ALLOW DVM VOLTAGE TO STABILIZE.
RAPIDLY TOUCH A TEST LIGHT CONNECTED TO
BATTERY POSITIVE (B+) TO THE KNOCK
SENSOR HARNESS CONNECTOR TERMINAL (CKT 496).
DOES THE VOLTAGE VALUE CHANGE?
4
FAULTY ECM.
NO
•
•
•
CONNECT A TEST LIGHT TO GROUND.
DISCONNECT KS MODULE HARNESS CONNECTOR.
TOUCH THE TEST LIGHT TO KS MODULE HARNESS
CONNECTOR TERMINAL “B” (CKT 439).
IS THE TEST LIGHT “ON”?
NO
YES
YES
NO
•
•
•
DISCONNECT KS MODULE HARNESS
CONNECTOR.
CONNECT A TEST LIGHT TO BATTERY
POSITIVE (B+).
TOUCH THE TEST LIGHT TO KS HARNESS
CONNECTOR TERMINAL “D” (CKT 486).
IS THE TEST LIGHT “ON”?
CKT 485 OPEN
OR
REPAIR OPEN
OR
SHORTED TO GROUND
OR
GROUNDED
CKT 439.
FAULTY KS MODULE.
YES
CKT 496 OPEN
OR
SHORTED TO GROUND
REPAIR OPEN
GROUND CKT
486.
OR
FAULTY KS MODULE.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-111
| 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