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