DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Code 44 (2 of 3): Knock Sensor (KS) Circuit
Step
Action
Yes
No
PROCEED TO
Was the “On-Board Diagnostic” (OBD) System Check
Performed?
1.
2.
Step 2.
OBD
Do you have a MEFI 3 ECM?
Step 7. Step 3.
a. Disconnect 5-wire KS module connector
b. Ignition ON, engine OFF.
3.
4.
c. Using a test light connected to ground, probe KS mod-
ule harness terminal “B” CKT 439.
Does test light illuminate?
Step 4. Step 9.
Step 5. Step 10.
a. Using a test light connected to battery positive (B+),
probe KS module harness terminal “D” CKT 486.
Does test light illuminate?
a. Ignition OFF
b. Reconnect KS module harness connector.
c. Disconnect ECM J1 connector.
d. Ignition ON, engine OFF.
5.
e. Connect DVOM from ECM CKT 485 to a known good
ground.
Step 6. Step 11.
Is the voltage within 8-10 volts?
a. Allow DVOM voltage to stabilize.
b. Connect a test light to battery positive (B+).
c. Touch test light to CKT 496.
6.
7.
8.
Does voltage value change?
Step 15. Step 12.
Step 15. Step 8.
a. Disconnect ECM J1 connector
b. Using DVOM, measure resistance between CKT 496
and ground.
Is resistance between 3000 - 5000 ohms?
a. Disconnect KS connector.
b. Using DVOM, measure resistance between KS and
ground.
Step 12. Step 14.
–
Is resistance between 3000 - 5000 ohms?
Locate and repair open or short to ground in CKT 439.
Locate and repair open in CKT 486.
9.
10.
–
Verify
Repair
a. Locate and repair open or short to ground in CKT 485.
Was a problem found?
11.
12.
Step 13.
–
a. CKT 496 open or shorted to ground.
Index
Page 5G-82
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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