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EC-180 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0078, P0084 EVT CONTROL MAGNET RETARDER P0078, P0084 EVT CONTROL MAGNET RETARDER Description INFOID:0000000010094883 Exhaust valve timing control magnet retarder (1) controls the shut/ open timing of the exhaust valve by ON/OFF pulse duty signals sent from the ECM. The longer pulse width retards valve timing. The shorter pulse width advances valve timing. DTC Logic INFOID:0000000010094884 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and let it idle for 5 seconds. 2. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010094885 Regarding Wiring Diagram information, refer to . 1. CHECK EXHAUST VALVE TIMING (EVT) CONTROL MAGNET RETARDER POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect EVT control magnet retarder harness connector. 3. Turn ignition switch ON. JMBIA0024ZZ DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0078 Exhaust valve timing control An improper voltage is sent to the ECM via • Harness or connectors (Exhaust valve timing control magnet • Exhaust valve timing control magnet re- tarder P0084 Exhaust valve timing control |