1995 Nissan Altima DTC P0505 P0705 P01400

1995 NISSAN ALTIMA
162,000 MILES • 4 CYL • FWD • AUTOMATIC
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ARMYPATT587
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I have a 1995 Nissan Altima GXE 2.4 Automatic. When I bought the car in June 09 it needed a Knock Sensor, Speed Sensor and new fuse block under the steering wheel. I had the 2 sensors changed by a mechanic, and the vehicle passed emissions in Aug 09. It has not been driven anymore than 300 miles in the time that I have owned it. The fuse block had been melted at the #25 fuse and the wire to that position had been burned and the sheathing had melted as far back as I could trace it and maybe further. I replaced the block and as much of the wire as I could about 2 months ago, and the car came out of "fail-safe" mode for about a week.

Recently the transmission has gone back to "fail-safe" modeand it is throwing DTCs P0505 Idle Air Control System, P1400 Differential Pressure Feedback EGR Circuit Low Input, P0705 Transmission Range Sensor.

Today I replaced the Idle Air Control Valve, the EGR Valve, and the plugs and wires. When I was finished I cleared the codes and test drove the vehicle. It did fine and shifted. I parked the car and came bock out 10 minutes later to move it and it right back to where it was before I started Throwing the same codes again.

I've checked the wire harness under the battery tray for damaged wires but have not checked under the passenger airbag yet.

Please help I'm totally lost on this now....
May 1, 2010 at 6:17 PM
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ARMYPATT587
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Also forgot to mention when I turn the key to the run position and leave it there without starting the car the "overdrive off" light flashes 16 times. I have a Haynes manual and its been absolutely no help. It only mentions that there is a series of 10 flashes for transmission flash codes, and it never even mentions the IACV.

Also I read this on a Maxima Forum

"Replacing the IACV is the first fix , then have the dealer erase the dtc, clear the self-learn & perform an idle air volume learn, that is if the wiring & connectors are ok, & re-check if the SES ligth will come back. If the same code comes back, chances are the old IAC motor may have knockout the ecm. Good luck.

Probably try to perform IAVL first & recheck, before replacing parts. You need a Consult 2 to do this."

Would the IAVL process apply to my problem in this situation and do I HAVE to take it to the dealer to have this done; or is there a way to do that at home?
May 2, 2010 at 7:25 AM
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KHLOW2008
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Hi ArmyPatt587,

Thank you for the donation.

DTC 25 (P0505) - IDLE AIR CONTROL VALVE - AUXILIARY AIR CONTROL (IACV-AAC)

DTC P0705/1003 OR 1101/NO FLASH: INHIBITOR, TP OR OD SWITCH

DTC 105 (P1400) - EGR & CANISTER CONTROL VALVE

Above are the three codes and their definition. The diagnostic procedure files are rather large so I will email them to you.

When the OD light blinks for a certain number of times with the ignition switch turned ON, it means an error has been detected and in this case it is the P0705, a fault with the inhibitor switch or its wiring.

You mentioned wiring problem and I would suggest checking the circuitry before replacement of parts.

To reset the PCM, disconnecting the battery dhouls do and there is no need to go to the dealer.
May 2, 2010 at 9:18 AM
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