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DTC P0327: Knock Sensor Circuit Low
 
 
 
 
CIRCUIT OPERATION
  • The knock sensor sends a signal voltage to the ECM terminal K/S.
  • The ground terminal is grounded with ECM terminal K/SE.
 
 
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)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
 
 
Check Condition
  • More than 2 seconds have passed since the engine starting sequence was completed.
Judgment Criterion
  • Knock sensor output voltage has continued to be lower than 0.5 volt 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 1 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
  • Knock sensor failed.
  • Open or shorted knock sensor circuit, or connector damage.
  • ECM failed.

 
 
DIAGNOSIS
STEP 1. Check of open circuit and harness damage in K/SE line between knock sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 2.
Repair it. Then go to Step 5.
 
STEP 2. Check of short to ground, open circuit and harness damage in K/S line between knock sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 3.
Repair it. Then go to Step 5.
 
STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0327 set?
Go to Step 4.
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
 
STEP 4. Replace the knock sensor.
(1) Replace the knock sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(3) Check the diagnostic trouble code (DTC).
Is DTC P0327 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 5.
The inspection is complete.
 
STEP 5. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0327 set?
Retry the troubleshooting.
The inspection is complete.