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23 PERFORM IDLE AIR VOLUME LEARNING Refer to “Idle Air Volume Learning”, EC-57. CMPLT or INCMP CMPLT © GO TO 24. INCMP © 1. Follow the construction of “Idle Air Volume Leaning”. 24 CHECK TARGET IDLE SPEED AGAIN With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 700 ± 50 rpm Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 700 ± 50 rpm OK or NG OK © GO TO 26. NG © GO TO 25. 25 CHECK ECM FUNCTION 1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of a problem, but this is rarely the case). 2. Perform initialization of NATS system and registration of NATS ignition key IDs. Refer to “NATS (Nissan Anti-Theft System)”, EC-72. © GO TO 23. 26 CHECK IGNITION TIMING AGAIN Check ignition timing again. Refer to Test No. 22. OK © GO TO 28. NG © GO TO 27. 27 CHECK TIMING CHAIN INSTALLATION Check timing chain installation. Refer to EM section. OK or NG OK © GO TO 25. NG © 1. Repair the timing chain installation. 28 ERASE UNNECESSARY DTC After this inspection, unnecessary DTC No. might be displayed. © INSPECTION END TROUBLE DIAGNOSIS — BASIC INSPECTION QG18DE Basic Inspection (Cont’d) EC-121 |