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Electronic Control System: Introduction

WARNING: This page is about a different car, the 2002 Infiniti QX4, 2001 Nissan Pathfinder, and 2001 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.

The transmission has two self-diagnostic systems. The first is the emission-related On-Board Diagnostic (OBD-II) system performed by the TCM in combination with the Engine Control Module (ECM). The malfunction is indicated by the Malfunction Indicator Light (MIL) and is stored as a DTC in the ECM memory, but not the TCM memory. The second is the TCM original self-diagnosis indicated by the O/D OFF indicator light. The transmission malfunction is stored in the TCM memory. The detected items are overlapped with OBD-II self-diagnostic items.

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