[Previous][Next]
DTC P0328: Knock Sensor Circuit High
 
 
 
 
CIRCUIT OPERATION
  • The knock sensor signal terminal sends a signal voltage to the ECM terminal K/S.
  • The knock sensor 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 EXECUTIONS (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
  • More than 2 seconds have passed since the engine starting sequence was completed.
Judgment Criterion
  • Knock sensor output voltage is more than 2.3 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 22
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are:)
  • 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 short circuit to power supply in K/S line between knock sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 2.
Repair the connector(s) or wiring harness. Then go to Step 4.
 
STEP 2. Check of short circuit to power supply in K/SE 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. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0328 stored?
Replace the ECM (Refer to, Removal and Installation ). Then 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. 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 22 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0328 stored?
Retry the troubleshooting.
The inspection is complete.