Tech Tip: Nissan Low Airflow from HVAC Front Air Vents
If you confirm one of the above vehicles has low airflow coming from the HVAC front air vents due to evaporator freeze-up, and the HVAC unit surface temperature around the evaporator is about 32 degrees Fahrenheit, causing ice to form on the evaporator, follow the Service Procedure in this Tech Tip, which involves replacing the intake sensor with P/N 27700-ZC00A.
Tech Tip: Nissan Rattling/Buzzing Noises in the Exhaust System
If you confirm there is an exhaust rattle/buzzing noise that sounds like it’s coming from the front exhaust tube, follow the procedures provided in this Tech Tip.
Tech Tip: Nissan DTC P0420 Stored in ECM
If you confirm DTC P0420 (Catalyst System Efficiency Below Threshold) is stored in the ECM, determine if this bulletin applies by checking the ECM part number.
Tech Tip: Infiniti Front End Popping/Squeaking/Clunking Noises
Applied vehicles: 2004-’10 Qx56 (JA60) [all 2004-’09 and 2010 vehicles built before: 5N3ZA(*)N(**)AN 904401] If you confirm: A noise (clunking squeaking popping) can be heard when performing at least one of the following actions: – turning the steering wheel left or right; – driving over speed bumps; – driving on rough roads; – accelerating or
Tech Tip: Nissan’s Engine Idle Speed is 25 RPM too High
If you confirm the idle, in Park or Neutral, is more than 25 rpm above specification (with the engine warm), and/or DTC P0507 (ISC System) is stored, this incident may be the result of recent cleaning or replacement of the throttle body. The vehicle “in-use” learned idle may be higher after throttle body deposits are reduced (by cleaning or replacement).
Tech Tip: DTC P0335 Stored in Nissan’s Self-Diagnosis Results
Use the information in this bulletin to repair a vehicle built prior to the applied VIN and date if the vehicle has DTC P0335 (Crankshaft Position Sensor [CKPS] [OBD]) stored in Self-Diagnosis Results.
Tech Tip: Nissan Engine Will Not Crank with Outside Temperature Below 10
A no crank condition may call for replacement of the Intelligent Power Distribution Module-IPDM.
Tech Tip: Nissan MIL On with DTC U 1000 or U 1010 Stored in ECU
If you confirm the MIL is on with DTC U1000 (CAN COMM CIRCUIT) or DTC U1010 (CAN COMM) [2006 Models only] stored in the engine control unit, and there are no driveability incidents, determine if this bulletin applies by performing steps 1 and 2 of this Service Procedure.
Tech Tip: Engine and A/C Performance Issues on Infiniti QX56 Models
Some Infiniti QX56 owners may complain about the engine or poor performance from their air conditioner. You may find there one or more conditions that are causing the issues.
Tech Tip: Infiniti DTC P0505 Due To Incorrect Idle Speed
If one of the applied vehicles above has a DTC P0505 AAC/V stored, with no customer driveability incident, it may be caused by an elevated or incorrect engine idle speed setting. In some of these cases, the Idle Air Volume Learning (IAVL) procedure should be performed to resolve the incident. Use the Service Procedure outlined in this Tech Tip to identify and address this incident.
Tech Tip: Nissan Optical Distributor Test
Many Nissan vehicles have a power transistor controlling the coil (or igniter). The power transistor is a separate unit on optical distributors. It allows the signal sent from the ECU (low current) to activate the primary circuit in the ignition coil (higher current). This induces high voltage in the secondary windings of the coil, providing spark to the distributor cap and plugs. If this transistor is faulty, the necessary spark will not result.
Tech Tip: Servicing Nissan with MIL On and O2 Sensor DTCs Set
If an applicable vehicle shows the MIL on and one or more of the following DTCs are stored in the ECM, then use the Service Procedure to diagnose and