2012 Infiniti M35hFACTORY OEM SERVICE PROCEDURE

Component Inspection (Ignition Coil with Power Transistor)

  1. CHECK IGNITION COIL WITH POWER TRANSISTOR-I
    1. Turn ignition switch OFF.
    2. Disconnect ignition coil harness connector.
    3. Check resistance between ignition coil terminals as per the following.
      Terminals Resistance (Ξ©) [at 25Β°C (77Β°F)]
      1 and 2 Except 0 or ∞
      1 and 3 Except 0
      2 and 3

      Is the inspection result normal?Β 

      YES: GO TO 2.

      NO: Replace malfunctioning ignition coil with power transistor. Refer to "EXPLODED VIEW ".

  2. CHECK IGNITION COIL WITH POWER TRANSISTOR-II
    CAUTION: Perform the following procedure in a place where with no combustible objects and good ventilation.
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pressure.
      NOTE: Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following procedure.
    4. Perform "INSPECTION MODE 5". Refer to "DESCRIPTION ".
    5. Start engine.
    6. After engine stalls, crank it two or three times to release all fuel pressure.
    7. Turn ignition switch OFF.
    8. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
    9. Remove ignition coil and spark plug of the cylinder to be checked. Refer to "EXPLODED VIEW ".
    10. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
    11. Connect spark plug and harness connector to ignition coil.
    12. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -0.66 in) between the edge of the spark plug and grounded metal portion as shown in the figure (see Figure).
    13. Crank engine for about three seconds, and check whether spark is generated between the spark plug and the grounded metal portion.
      Fig 1: Identifying Fuel Pump Fuse And IPDM E/R
      G08255750Courtesy of NISSAN NORTH AMERICA, INC.

      Spark should be generatedΒ  .

      CAUTION:
      • Never place the spark plug and the ignition coil within 50 cm (19.7 in) each other. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.
      • It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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