W/Harness Inspection

P0327 Knock Sensor 1 Circuit Low Input

Inspection/Repair - W/Harness Inspection

Terminal and Connector Inspection

1. 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.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "Knock sensor circuit inspection" procedure.

Signal Circuit Inspection

1. Check voltage
(1) Key "OFF".
(2) Disconnect Knock sensor connector.
(3) Key "ON".
(4) Measure the voltage between terminal 1 of knock sensor harness connector and chassis ground.
(5) Measure the voltage between terminal 2 of knock sensor harness connector and chassis ground.
A. Specification : Approx 2.4 V




(6) Is the measured voltage within specification?
YES
1) Go to "Component inspection" procedure.
NO
1) Go to "Check resistance" procedure.
2. Check resistance
(1) Key "OFF".
(2) Disconnect Knock sensor connector and ECM connector.
(3) Measure the resistance between terminal 1 of knock sensor harness connector and 30 of PCM harness connector. [A/T]
Measure the resistance between terminal 1 of knock sensor harness connector and 32 of ECM harness connector. [M/T]
(4) Measure the resistance between terminal 2 of knock sensor harness connector and 15 of PCM harness connector. [A/T]
Measure the resistance between terminal 2 of knock sensor harness connector and 11 of ECM harness connector. [M/T]
A. Specification : Below Approx 1 Ohms




(5) Is the measured resistance within specifications?
YES
1) Repair Short to ground in signal circuit and then, go to "Verification of Vehicle Repair" procedure.
NO
1) Repair Open in signal circuit and then, go to "Verification of Vehicle Repair" procedure.