ECM Circuit Check

WARNING: This page is about a different car, the 2002 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Check following terminals and connector for damage, bend and loose connection. (control module-side and harness-side)
  - ECM.
  - Harness connector F34.
  - Harness connector E34.
OK or NG
1. OK >> GO TO 2.
2. NG >> Repair terminal or connector.
CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ECM connector.
2. Check resistance between ECM harness connector F102 terminals 174(LG/B) and 171(P/B).
  174(LG/B) - 171(P/B) : Approx. 108 - 136ohm
  
  Fig 1: Checking Resistance Between ECM Harness Connector F102 Terminals 174(LG/B) And 171(P/B)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK >> Replace ECM.
2. NG >> Repair harness between splice points E54, E55 and ECM.