DTC P0328: Knock Sensor Circuit High

CIRCUIT OPERATION

• The knock sensor (terminal No. 2) sends a signal voltage to the ECM (terminal No. 25).
  
• The ground terminal (terminal No. 1) is grounded with ECM (terminal No. 42).
  

TECHNICAL DESCRIPTION

• The knock sensor converts the vibration of the cylinder block into a voltage and outputs it.
  
• The ECM checks whether the voltage is within a specified range.
  

DESCRIPTIONS OF MONITOR METHODS

Knock sensor output voltage is out of specified range.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

• Not applicable
  

• Not applicable
  

DTC SET CONDITIONS

• 2 seconds or more have passed since the engine starting sequence was completed.
  

• Knock sensor output voltage has continued to be higher than 2.25 volts for 2 seconds.
  

FAIL-SAFE AND BACKUP FUNCTION

• Fix the ignition timing with an allowance against knock.
  

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 .

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

• Shorted knock sensor circuit or connector damage.
  
• ECM failed.
  

	Go to Step 2.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 3.

	Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 3.

	Repair it. Then go to Step 3.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 .

	Retry the troubleshooting.

	The inspection is complete.