SERVICE MANUAL NUMBER 23
TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
Code 43 (3 of 3): Knock Sensor (KS) Circuit (Non-Scan)
STEP
ACTION
VALUE
YES
NO
PROCEED TO
1.
Disconnect knock module harness con-
nector.
2.
Connect a test light to battery positive
(B+).
6
3.
Touch the test light to KS harness con-
nection terminal “D” (CKT 486).
Is test light on?
–
Step 10 Step 13
1.
Connect a test light to ground.
2.
Disconnect KS module harness connec-
tor.
7
3.
Touch the test light to KS module har-
ness connector terminal “B” (CKT439).
Is the test light on?
–
–
Step 11 Step 12
Inspect knock sensor terminal contacts. If OK,
replace knock sensor.
8
9
–
–
–
–
–
–
–
–
Check for open or short in CKT 496. If OK,
replace knock sensor.
–
–
–
CKT 496 open, shorted to ground, or faulty
knock sensor module.
10
11
CKT 485 open, shorted to ground, or faulty
knock sensor module.
12
13
14
Repair open or grounded CKT 439.
Repair open ground CKT 486.
Faulty ECM.
–
–
–
–
–
–
–
–
–
Index
90-861326--1
MARCH 1999
Page 5F-19
| 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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