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Home >> Suzuki >> 2011 >> Grand Vitara Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis >> Diagnostic Information and Procedures >> DTC P0327: Knock Sensor 1 Circuit Low; P0328: Knock Sensor 1 Circuit High >> DTC Troubleshooting
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DTC Troubleshooting

P0327, P0328 DIAGNOSIS PROCEDURE

Step Action YES NO
1  Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK:J24B .
2  Knock sensor signal circuit and ground circuit check 
  1. Turn OFF ignition switch and disconnect connectors from knock sensor and ECM.
  2. Check for proper terminal connection to knock sensor and ECM connectors.
  3. If connections are OK, check that knock sensor signal circuit (A1) and ground circuit (A2) are as follows.
    • Wiring harness resistance of each knock sensor signal circuit and ground circuit is less than 3 Ω.
    • Insulation resistance of knock sensor signal circuit is infinity between knock sensor connector and vehicle body ground.
    • Insulation resistance of wire harness is infinity between knock sensor signal circuit terminal and the other terminal at knock sensor connector.
    • Circuit voltage of each knock sensor signal circuit and ground circuit is 0 - 1 V with ignition switch in ON position.

Are they in good condition? 		 Go to Step 3. Repair or replace defective wire harness.
3  Knock sensor check 
  1. Check knock sensor, see KNOCK SENSOR INSPECTION .

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace knock sensor.
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