Nissan Maxima Service and Repair Manual: ECU diagnosis information

• BCM (body control module)

Reference Value NOTE: The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II User Guide for additional information. Activate and display TPMS transmitter IDs Display tire pressure reported by the TPMS transmitter Read TPMS DTCs Register TPMS transmitter IDs Check Intelligent Key relative signal strength Confirm vehicle Intelligent Key antenna signal strength VALUES ON THE DIAGNOSIS TOOL Terminal Layout Physical Values Fail Safe DTC Inspection Priority Chart If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart.

• IPDM E/R (intelligent power distribution module engine room)

Reference Value VALUES ON THE DIAGNOSIS TOOL TERMINAL LAYOUT PHYSICAL VALUES Fail Safe CAN COMMUNICATION CONTROL When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN communication recovers normally, it also returns to normal control. If No CAN Communication Is Available With ECM If No CAN Communication Is Available With BCM IGNITION RELAY MALFUNCTION DETECTION FUNCTION  IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay-1 inside it.  IPDM E/R judges the ignition relay-1 error if the voltage differs between the contact circuit and the excitation coil circuit.