Reviving my own (old) thread because:
a) I never found a fix and now it's gone from intermittent to routine.
b) I've done more research an found a "possible" fix that I'll try soon and it's worth sharing. See below
c) Just got a PM from a member needing to know how to locate the sensor.
d) Hoping that by now there are others who may have some input.
First, to answer the location question, the Transmission Range Sensor (also called Park/Neutral Switch in the Montero Manual and Neutral Safety Switch by most other car parts companies) is a pie shaped flat cast aluminum unit about 3" wide bolted to the passenger (right) side of the transmission. If you look at the drivers side and follow the shifter cable to where it attaches to the shift operating rod - that rod goes all the way through the casing and the sensor is attached to the opposite end. So it's just across from the cable connctor. When the shift cable rotates the operating shaft to select the gears, the sensor's internal contacts rotate and accomplish 3 things:
1) In Park and Neutral (ONLY) it completes the circuit from the key switch to the starter solenoid (thus the Neutral Safety Switch name)
2) It has six outputs, one for each gear selection and these tell the ECU and A/T Computer the position of the operating shaft - these also turn on the PRND32 indicator lamps in the instrument panel.
3) In "R" it completes the Back Up light circuit, turning on the BU Lights.
My main frustration so far is that, in accomplishing these things, my switch works perfectly. Truck starts only in P or N, all the indicator lights are correct, and the Back Up lights come on at the proper time. BUT, I keep getting the P0705 code.
I found documention in the OBDII manual that the 705 code is only triggered if the ECU gets two "ON" signals at the same time - e.g. D + 2. Elsewhere it says the code is thrown by an open or short in the switch. But if that's what's happening to me, there would be actual faillure symptoms in the lights or starting operation and as I said operationally my unit seems fine. Hope it's not an ECU or wiring harness problem.
Anyway, I found the Jeep DIY article linked below and it appears to be an almost exact copy of the Mitsu sensor so my next step, as soon as weather permits is to see if I can open and clean mine. (Will check and clean the connector pins first) No guarantee that ours can be disassembled like the Jeep versions but it's worth a look-see. Will post what I find. If anyone has any experince to share please jump in.
EDIT: Here's an even better link: http://www.bc4x4.com/tech/2010/jeep-...ty-switch-nss/