This bulletin applies to all 2002 and later Infiniti vehicles. The MIL may be on, along with DTC P0128 stored (thermostat function).
Check to see if an aftermarket remote starter system has been installed. Remote starter systems may cause the MIL to illuminate and the DTC to store.
If a remote starter system is installed, remove/disconnect it before performing diagnostic procedures. Refer to ASIST and the ESM (electronic service manual) for diagnostic information.