TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
Code 43 (2 of 2): Knock Sensor (KS) Circuit (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 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 test light illuminate?
1. Ignition “OFF.”
2.
Reconnect KS module harness connec-
tor.
3.
4.
5.
Disconnect J1 connector.
8-10
Volts
Ignition “ON,” engine “OFF.”
Connect DVOM from ECM harness ter-
minal J1-1 (CKT 485) to a known good ground.
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-64
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 |
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