Nissan Armada 2025-2026 Service and Repair Manual: On Board Diagnostic (OBD) System of Engine and A/T
The ECM and TCM have an on board diagnostic system. It will illuminate the malfunction indicator lamp (MIL) to warn the driver of a malfunction causing emission deterioration.
CAUTION:
Always turn the ignition switch OFF and disconnect the negative battery cable before any repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause the MIL to illuminate.
Always connect and lock the connectors securely after work. A loose (unlocked) connector will cause the MIL to illuminate due to the open circuit. (Be sure the connector is free from water, grease, dirt, bent terminals, etc.)
Certain systems and components, especially those related to OBD, may use a new style slide-locking type harness connector. For description and how to disconnect, refer to Harness Connector.
Always route and secure the harnesses properly after work. The interference of the harness with a bracket, etc. may cause the MIL to illuminate due to the short circuit.
Always connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MIL to illuminate due to the malfunction of the EVAP system or fuel injection system, etc.
Always erase the unnecessary malfunction information (repairs completed) from the ECM and TCM (Transmission control module) before returning the vehicle to the customer.
Precautions for Removing Battery Terminal
NOTE:
NOTE:
NOTE:
The removal of 12V battery may cause a DTC detection error.
HOW TO DISCONNECT 12V BATTERY TERMINAL
Disconnect 12V battery terminal according to instruction described below.
Open th ...
General Precautions
Ignition switch OFF and disconnect the battery cable from the negative terminal before connecting or disconnecting the A/T assembly connector. Because battery voltage is applied to TCM even if ignitio ...
Other materials:
Work Flow
OVERALL SEQUENCE
DETAILED FLOW
OBTAIN INFORMATION ABOUT SYMPTOM
Interview the customer to obtain as much information as possible about the conditions and environment under which the malfunction occurred.
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GO TO 2.
CHECK SYMPTOM
Check the symptom based on the information obtained from the ...
Change of System Mode
CAUTION:
When the following operations are performed, always use CONSULT, for performing "System mode change" of "Work support". Refer to Work Procedure.
×: Required —: not required
Procedure System mode change Removing/installing ABS actuator and electric unit (control unit) — Replacing ...
Vehicle Dynamic Control (VDC) OFF switch
The Nissan Armada should normally be driven with the Vehicle Dynamic Control
(VDC) system enabled, as it helps maintain vehicle stability and traction.
In situations such as being stuck in mud, snow, or sand, the Nissan Armada VDC
system may reduce engine power to limit wheel spin. This can ...
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