TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
Code 43 (1 of 2): Knock Sensor (KS) Circuit (Non-Scan) Continuous Knock
Detected
STEP
ACTION
VALUE
YES
NO
PROCEED TO
Go to
Was the “On-Board Diagnostic” (OBD) System
Check Performed?
OBD
System
Check
1
2
–
Step 2
1.
Disconnect 5-wire Knock Sensor (KS)
module harness connector.
2.
3.
Ignition “ON,” engine “OFF.”
Using a test light connected to ground,
probe KS module harness terminal “B” (CKT
439).
Does the test light illuminate?
Step 3
Step 4
Step 5
Step 6
Using a test light connected to battery positive
(B+), probe KS module harness terminal “D”
(CKT 486).
3
4
Does the test light illuminate?
1. Ignition “OFF.”
2.
Reconnect KS module harness connec-
tor.
3.
4.
5.
Disconnect ECM J1 connector.
Ignition “ON,” engine “OFF.”
Connect DVOM from ECM harness ter-
minal J1-1 (CKT 485) to a known good ground.
8-10
Volts
Is the voltage within the specified value?
Step 9
Step 7
Locate and repair open or short to ground in
CKT 439. Is action complete?
5
6
–
–
–
–
Locate and repair open in CKT 486. Is action
complete?
Locate and repair open or short to ground in
CKT 485. If a problem is found, repair as nec-
essary. Was a problem found?
Verify
Repair
7
–
Step 8
8
9
Replace faulty KS module. Is action complete?
–
–
–
–
Repair faulty ECM connections or replace
faulty ECM. Is action complete?
Page 5G-32
90-861326--1 MARCH 1999
| 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 |
(1 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...