Nissan

System Description
- IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block
which were originally placed in engine compartment. It controls integrated relays via IPDM E/R control cir-
cuits.
- PDM E/R-integrated control circuits perform ON-OFF operation of relays, CAN communication control,
etc.
- It controls operation of each electrical component via ECM, BCM and CAN communication lines.

When draining all of the coolant in the system for engine removal or repair, it is necessary to drain the cylinder block. Remove the RH cylinder block drain plug to drain the right bank
and the oil cooler hose to drain the left bank as shown.

Inspection After Installation
-After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps.
- Apply fuel pressure to fuel lines with turning ignition switch ON (with engine stopped). Then check for fuel leaks at connections.
- Start the engine and rev it up and check for fuel leaks at connections. Perform procedures for “Throttle Valve Closed Position Learning” after finishing repairs.
- If electric throttle control actuator is replaced, perform procedures for “Idle Air Volume Learning” after finishing repairs

Precautions for Refrigerant Connection
A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
- Expansion valve to cooling unit
- Evaporator pipes to evaporator (inside cooling unit)
- Refrigerant pressure sensor

In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units related to the root cause malfunction or go into fail-safe mode.