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1F-21 CHANGED BY EFFECTIVE DATE AFFECTED VIN ENGINE CONTROLS M162 GSL ENG SM - 2005.7 Circuit Description The KS system is used to detect engine detonation, allowing the ECM to retard the ignition control spark timing based Knock Sensor Resistance Inspection 1. Disconnect the coupling from ECM while the ignition switch is in “OFF” position. 2. Measure the resistance between the coupling terminal pin No. 118 and No. 117 and terminal pin No. 115 and No. 114 using a multimeter. Notice Replace the KS if the measured values is out of the specified values. Check the connector and wire connection Specified value >10 M Ω Failur Code Maintenance Hint • Inspection the ECM pin 118, 117about short circuit or open with • Inspection the KS 1 malfunction • Inspection the ECM • Inspection the ECM pin 115, 114 about short circuit or open with • Inspection the KS 2 malfunction • Inspection the ECM Trouble Area Description 57 When recognition in more than control gain threshold at normal operational condition of other system during over 75 and 3,000 rpm running area (cylinder 4, 5, 6) No. 2 knock sensor signal failure 56 When recognition in more than control gain threshold at normal operational condition of other system during over 75 and 3,000 rpm running area (cylinder 1, 2, 3) No. 1 knock sensor signal failure |