DTC Troubleshooting: P0327

DTC P0327: Knock Sensor Circuit Low Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0327 Knock Sensor Circuit Low Voltage

Problem verification:

Problem verification

?1.	Turn the vehicle to the ON mode.

?2.	Clear the DTC with the HDS.

?3.	Turn the vehicle to the OFF (LOCK) mode.

?4.	Turn the vehicle to the ON mode.

?5.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0327 Knock Sensor Circuit Low Voltage

Is DTC P0327 indicated?


	YES

The failure is duplicated. Go to step 2.


	NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the knock sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?

Determine possible failure area (knock sensor, others):

Determine possible failure area (knock sensor, others)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Disconnect the following connector.

Knock sensor 2P connector

?3.	Turn the vehicle to the ON mode.

?4.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0328 Knock Sensor Circuit High Voltage

Is DTC P0328 indicated?


	YES

Replace the knock sensor.?


	NO

Go to step 3.

Shorted wire check (KS line to SG7 line):

Shorted wire check (KS line to SG7 line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector C (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector C (51P) disconnected
	Knock sensor 2P connector: disconnected
Test point 1	Knock sensor 2P connector No. 1
Test point 2	Knock sensor 2P connector No. 2

Is there continuity?


	YES

Repair a short in the KS wire to the SG7 wire between the PCM and the knock sensor.?


	NO

Go to step 4.

Shorted wire check (KS line):

Shorted wire check (KS line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector C (51P) disconnected
	Knock sensor 2P connector: disconnected
Test point 1	Knock sensor 2P connector No. 2
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the KS wire between the PCM (C29) and the knock sensor.?


	NO

The KS wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0327 goes away and the PCM was updated, troubleshooting is complete. If DTC P0327 goes away and the PCM was substituted, replace the original PCM.?