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Home >> Infiniti >> 2002 >> Q45 >> Repair and Diagnosis >> External Pages >> Different car >> Section 216 (Engine Control System) >> DTC P0420, P0430: Three Way Catalyst Function >> Diagnostic Procedure >> 5. Check Injectors

5. Check Injectors

WARNING: This page is about a different car, the 2004 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
  1. Stop engine and then turn ignition switch ON.
  2. Check voltage between ECM terminals 5, 6, 7,13,14,15,16,17 and ground with CONSULT-II or tester.
    1. Voltage: Battery voltage 
    Fig 1: Checking voltage between ECM terminals 5, 6, 7,13,14,15,16,17 & ground
    G00760901Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Refer to Wiring Diagram for Injectors, Wiring Diagram  .

OK or NG 

OK : GO TO 6.

NG : Perform Diagnostic Procedure  .