I have a 2001 Jeep Cherokee sport 4WD with the 4.0 L and Auto Trans. I keep getting code 705 and the check engine lite for a neutral safety/ transmission sensor switch malfunction. I checked the switch with an ohm meter and it checks out OK. I then removed it and took it apart and cleaned it internally and put it back together as reccomended by another web site. Checked it again and the ohm meter says it is fine. I even checked the mating connector for power and ground. Voltage looked a little low on the power pin (11.8V) but the ground was good. The same power is used for the backup lites, and they work fine. When I clear the code, I barely make it out the driveway before the code 1899 (neutral safety switch issue) and/or 705 ( transmission sensor switch malfunction) show up. The two switch names seem to be used interchangably in the shop manual. ( I have the manufacturer full shop manual) The 705 code makes the check engine lite come on and stay on. The 1899 code just shows up, but does not make the check engine lite come on. The car runs fine and the transmission shifts fine, but I can't seem to find the source of the 705 error code. All other connectors to the Transmission Controller and Power Train controller seem to be tight and clean. No sign of damage, bent contacts or corrosion.

P0705 - RANGE SENSOR

When Monitored and Set Condition:
P0705 - RANGE SENSOR

When Monitored: Continuously with the key on.

Set Condition: No transmission Range Sensor signals are receded or two conflicting signals are received from the Transmission Range Sensor at the same time by the TCM.

POSSIBLE CAUSES:
PCM PARK/NEUTRAL DTC'S PRESENT
INTERMITTENT WIRING AND/OR CONNECTORS
FUSED IGNITION SWITCH OUTPUT OPEN OR HIGH RESISTANCE
TRS 1-2 SENSE CIRCUIT OPEN
TRS 3 SENSE CIRCUIT OPEN
TRS OVERDRIVE SENSE CIRCUIT OPEN
TRS REVERSE SENSE CIRCUIT OPEN
TRS 1-2 SENSE CIRCUIT SHORTED TO GROUND
TRS 3 SENSE CIRCUIT SHORTED TO GROUND
TRS OVERDRIVE SENSE CIRCUIT SHORTED TO GROUND
TRS REVERSE SENSE CIRCUIT SHORTED TO GROUND
TRS 1-2 SENSE CIRCUIT SHORTED TO VOLTAGE
TRS 3 SENSE CIRCUIT SHORTED TO VOLTAGE
TRS OVERDRIVE SENSE CIRCUIT SHORTED TO VOLTAGE
TRS REVERSE SENSE CIRCUIT SHORTED TO VOLTAGE
TRANS RANGE SENSOR - SENSE CIRCUIT
TCM -TRS SENSE CIRCUIT INPUTS

SYMPTOM
P1899-P/N SWITCH PERFORMANCE

POSSIBLE CAUSES

• Intermittent park/neutral switch sense circuit
• Park/neutral position switch
  
• Park/neutral switch sense circuit open
• Park /neutral switch sense circuit shorted to ground
• Powertrain control module.
  

<<< I'm sure you have this but I posted it anyway...don't have anything else to offer.>>>>