Code 43: Knock Sensor (KS) Circuit (Non-Scan)
(2
of 2)
1
•
•
DISCONNECT 5 WAY KS MODULE CONNECTOR.
USING DVM, MEASURE RESISTANCE BETWEEN
TERMINAL “E” AND GROUND.
•
RESISTANCE SHOULD BE BETWEEN 3.3KΩ AND 4.5KΩ
OHMS.
IS IT?
YES
NO
2
•
•
•
•
•
•
RECONNECT 5 WAY KS MODULE CONNECTOR.
DISCONNECT KNOCK SENSOR HARNESS CONNECTOR.
CONNECT A TEST LIGHT TO BATTERY POSITIVE BATTERY POSITIVE (B+).
START ENGINE.
HOLD ENGINE SPEED STEADY AT 2500 RPM.
REPEATEDLY 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
4
•
•
ALLOW DVM VOLTAGE TO STABILIZE.
•
•
•
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”?
TOUCH A TEST LIGHT CONNECTED TO
B+ TO THE KNOCK SENSOR HARNESS
CONNECTOR TERMINAL (CKT 496).
DOES THE VOLTAGE VALUE CHANGE?
NO
YES
YES
NO
•
•
•
DISCONNECT KS MODULE HARNESS
CONNECTOR.
FAULTY ECM.
CKT 485 OPEN
OR
SHORTED TO GROUND
OR
REPAIR OPEN
OR
GROUNDED
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 439.
FAULTY KS MODULE.
YES
NO
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-97
Product Specification
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 |
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