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Posted 12 June 2009 - 07:55 AM
IPDM-ER is the (Intelligent Power Distribution Module in the Engine Room).
Failure Symptoms: Truck can be stuck in "limp mode", erratic flashing lights such as SLIP, 4WD, ABS, Check engine etc., and most importantly the engine dies and can only be restarted after some time!... :smt005
New reports are also showing Titans that won't start up from cold due to a failed IPDM-ER.
Don't look for warning lights or codes to assist you for the diagnosis of a failed IPDM-ER board however there is a "Auto Active Test" feature you can perform easily:
1- Turn the ignition switch on
2- Press the door light activator switch in 10 times........notice the open door light on the dash will flash each time you press the switch.
3- Turn the ignition switch Off then back ON.
4- The horn will beep, oil light will flash, the defroster will cycle, headlights will flash, cooling fan will cycle, wipers will come on and ac compressor will cycle if the IDPM-ER is functioning "NORMAL".
In an Emergency: you may "swap to get you to the shop" the ECM relay & the Fog Lamp relay on the circuit board : but it has been known to only be a very short lived fix.
After the board is lifted up there isn't enough room to lean it back and switch the relays at the bottom with all the wires/plugs in the way so it must come all the way out for a temporary repair.
The OEM warranty on the IPDM-ER is 36 months or 36,000 miles.
Cost of IDPM replacment: Costs from dealers range from ~$180+ to $250 however our vendor Brian at NISSAN PARTS in New Jersey is offering a great price of $92.58 + ship.
Part# for 04-06 Titans is 284B6-ZC00A Be sure to have your Titan year and VIN# for 100% identification when ordering... :smt004
NISSAN has addressed this known electrical circuit board component failure and this is "THE" complete upgraded/improved replacement. :smt023
Removal of the IPDM-ER (Intelligent Power Distribution Module in the Engine Room) circuit fuse/relay board.
The job will take about 30 minutes....I know because I did a "test-run".
Seven plugs on the circuit board must carefully be unlocked with a small flat screwdriver and removed, then the board can be removed for switching the relays or total board replacement.
NOTE-1: This isn't a job I would prefer to do on the side of the road or with a hot engine bay as one must lean over the battery or between the battery and the open hood which is very close quarters...but I could do it if I had to.
NOTE-2: I placed a tarp over the battery and just leaned into the job to stay clean.
1- Remove the battery negative cable first then the positive.
2- Remove the IPDM upper black plastic cover then release the two plastic clips on the IDPM and use a small flat screw driver to push the connector locks inward to release and remove each of the seven plugs.
3- After all the plugs are removed lift the board pull out upside down only.
4- Remove the board and insert the replacement board (or make the temporary relay swap) and reconnect the seven plugs and finally the battery cable(s).
Note: A common pliers tool will assist removal of the relays if a temporary repair is to be used.
Test start your Titan and enjoy!.... :smt023 :-D
For those that need to perform the TEMPORARY relay swap:
(See 2nd picture/diagram below for relays to swap)
Note: A common pliers tool will assist removal of the relays if a temporary repair is to be used.
Three relays have the same numbers on top: NAIS 4 on the left side and on the right side 40814F 1401 Thailand
On the bottom AGM33201 MO8
The 2nd relay down or the ECM relay has NAIS 5 on the left side and on the right side 40919 1913 Japan
On the bottom ACM33211 MO9
NOTE: This is the only relay made in Japan.
The fourth relay down is the Fog Light Relay.
Pin configurations of all relays are the same and consist of four blades.
You must pay attention to put them back in facing the same direction or they won't plug into the sockets properly so take note when removing.
All four relays on the ECM and Fog Light Relay side of the board face the same direction.
All of the relays on the upper five relay side of the board have a NAIS 4 number like the ECM relay side of the board with four relays.
How's the IPDM-ER circuit board work on my Titan!?! :
ECM (Engine Control Module)
The Engine Control Unit or ECU is a designated computer that was developed to manage the engine control system. The ECM consists of electronics which are mounted on multi-layer circuit board. The ECM monitors and adjusts the air/fuel mixture and utilizes a catalytic converter to minimize amount of pollution produced from the engine. There are two modes of operation, closed loop, which means the computer has completely taking over the operation system. And open loop which is used when the engine is cold and operates on a preset program. The engine must be at operating temperature before it can go into closed loop.
ECM Engine Control Computer
The ECM monitors the input and output signals produced by various sensors in the system. The ECM then adjusts the system as necessary. Sensors can include: oxygen sensor, coolant sensor, mass air flow sensor, air intake sensor, crankshaft angle sensor, throttle position sensor, camshaft angle sensor and knock sensor. The ECM operating program consists of information cells. These cells hold the code for proper engine operation, if information is out side the cell parameters a MIL (malfunction inductor lamp) or "check engine light".
Once a "check engine" or a "service engine soon" light in your instrument cluster has illuminated the ECM has stored a diagnostic trouble code. This means the computer system on your vehicle has detected a problem with the various systems it controls. Your car or truck has many different sensors that monitor the various vehicle systems. If the trouble code light has been illuminated your vehicle enters into "limp mode" this means it is running on a predetermined program that causes poor mileage and increased emissions. An engine trouble code reader is an easy to use tool. All 1996 and newer vehicles utilize a "D" style plug-in connector that connects to the code reader. On most vehicles the connector is located at the driver's compartment. Once the code reader is plugged in you can retrieve trouble codes the engine computer has stored in its memory. These codes are the same codes the dealer and repair shops use to replace sensors and clear codes.
The ECM outputs a 5 volt reference to most sensors to drive the monitoring circuits. The ECM also controls the radiator cooling fan, air pump controls, fuel pump, EVAP system and more depending on the vehicle. Communication standards have being established in the OBD2 operating system. Among the communication standards controller area networking or CAN has become very popular and can achieve communication speeds of more than 500 Kbps, which is faster than most communication standards.
Advantages of using buses for communication is that if a fault occurs with any of the process modules, it can be reported separately to a diagnostic tool. Manufacturers have different trouble code faults although some are generic. Wiring is simplified by a technique known as multiplexing. In this kind of wiring system is assigned for each module, which consolidates the output and input for that module.
I hope this helps anyone in need or to save $$$!...... :smt004 :smt003
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This post has been edited by honeykeeper: 21 August 2009 - 09:41 PM
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