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Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (L79) >> Diagnostic Information and Procedures >> DTC P1121 or P1122 >> Circuit/System Testing

Circuit/System Testing

Engine running, observe the scan tool throttle position (TP) sensor parameter while moving the related wiring harness and harness connectors. The reading should not change abruptly.

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