Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
▶ Go to " Signal Circuit Inspection " procedure.
Check for short to ground in harness
Ignition "OFF"
Disconnect IG failure sensor connector.
Measure resistance between terminal 1 of knock sensor harness connector and chassis ground.
Specification : Infinite
Is the measured resistance within specifications?
YES
▶ Go to " Check for short to battery in harness " as below.
NO
▶ Check short to ground in signal harness.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
Check for short to battery in harness
Ignition "OFF"
Disconnect knock sensor connector.
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 1 of knock sensor harness connector and chassis ground.
Specification : Approx. 0V
Is the measured voltage within specifications?
YES
▶ Go to " Check for open in harness " as below.
NO
▶ Check for short to battery in harness.
▶ Repair or replace as necessary and then, go to " Verification of Vehicel Repair " procedure.
Check for open in harness
Ignition "OFF"
Disconnect knock sensor connector and PCM connector.
Measure resistance between terminal 1 of knock sensor harness connector and terminal 20/C21-C of PCM harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
▶ Go to "Ground Circuit Inspection" procedure.
NO
▶ Check for open in harness..
▶ Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
Check for open in harness
Ignition "OFF"
Disconnect Knock sensor connector.
Measure resistance between terminal 2 of knock sensor harness connector and chassis ground.
Specification : Approx. below 1Ω
Is the measured resistance within specifications ?
YES
▶ Substitute with a known - good knock sensor and check for proper operation.
▶ If the problem is corrected, replace knock sensor and go to "Verification of Vehicle Repair" procedure.
NO
▶ Check for open in harness.
▶ Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
