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Diagnostic Procedure NMEC0710 1 RETIGHTEN GROUND SCREWS Loosen and retighten engine ground screws. SEC377C © GO TO 2. 2 CHECK INPUT SIGNAL CIRCUIT 1. Turn ignition switch “OFF”. Refer to wiring diagram. Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG OK © GO TO 4. NG © GO TO 3. 3 DETECT MALFUNCTIONING PART Check the following. I Harness connectors F28, F121 I Harness for open or short between knock sensor and ECM © Repair open circuit or short to ground or short to power in harness or connectors. 4 CHECK KNOCK SENSOR Refer to “Component Inspection”, EC-140. OK or NG OK © GO TO 5. NG © Replace knock sensor. 5 CHECK SHIELD CIRCUIT 1. Reconnect harness connectors disconnected. Refer to wiring diagram. Continuity should exist. 4. Also check harness for short to power. OK or NG OK © GO TO 6. NG © Repair open circuit or short to power in harness or connectors. GI MA EM LC FE CL MT AT PD AX SU BR ST RS BT HA SC EL IDX DTC 0304 KNOCK SENSOR (KS) Diagnostic Procedure EC-139 |