Mercury MerCruiser MCM 454 Mag MPI Service Manual page 733

TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
Code 43 (3 of 3): Knock Sensor (KS) Circuit (Scan)
STEP
7
8
9
10
11
12
13
14
Index
Page 5F-36
Downloaded from https://needmanual.com/
ACTION
1. Connect a test light to ground.
2. Disconnect KS module harness connector.
3. Touch the test light to KS module harness
connector terminal "B" (CKT439).
Is the test light on?
Inspect knock sensor terminal contacts. If OK,
replace knock sensor.
Check for open or short in CKT 496. If OK, re-
place knock sensor.
CKT 496 open, shorted to ground or faulty
knock sensor module.
CKT 485 open, shorted to ground or faulty
knock sensor module.
Repair open or grounded CKT 439.
Repair open ground CKT 486.
Faulty ECM.
SERVICE MANUAL NUMBER 23
VALUE YES NO
PROCEED TO
– Step 11 Step 12
– –
– –
– –
– –
– –
– –
– –
90-861326--1 MARCH 1999
–
–
–
–
–
–
–