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Home >> Chevrolet >> 2006 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P1321 >> Component Testing
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Component Testing

  1. Ignition OFF, disconnect the harness connector of the crankshaft position (CKP) sensor.
    2. IMPORTANT: If the CKP sensor lead is damaged in any way, replace the CKP sensor.
  2. Connect a DMM between the signal circuit and the low reference circuit of the CKP sensor.
  3. Test for 460-620 ohms between the signal circuit and low reference circuit.
    • If the resistance is not within the specified range, replace the CKP sensor.
  4. Disconnect the fuel pump relay.
  5. Set the DMM to the AC voltage scale.
  6. While cranking the engine, test for more than 1.4 ACV between the signal circuit and low reference circuit of the CKP sensor.
    • If less than 1.4 ACV, replace the CKP sensor.
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