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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 stored 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
  • 2 seconds or more 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 23 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are: )
  • Knock sensor failed.
  • Open or shorted knock sensor circuit or connector damage.
  • ECM failed.

 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
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 4.
 
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 the connector(s) or wiring harness. Then go to Step 4.
 
STEP 3. 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 22 .
(3) Check the diagnostic trouble code (DTC).
Is DTC P0327 stored?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 4.
The inspection is complete.
 
STEP 4. 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 23 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0327 stored?
Retry the troubleshooting.
The inspection is complete.