P0705

DTC P0705:

Transaxle Range Switch Wiring Schematic:

CIRCUIT DESCRIPTION
The transmission range switch is part of the Transmission Neutral Start Switch (TMNSS) mounted on the transaxle assembly. It is a multi-signal switch sending information relative to gear selector position to the Powertrain Control Module (PCM). The PRNDL input consists of 4 discrete circuits to pull 4 PCM voltages low in various combinations to indicate each gear range. The voltage level of each of the circuits is represented as low = grounded circuit, high = open circuit. The 4 states displayed represent decoder Parity, A, B, and C inputs respectively.

DIAGNOSTIC TROUBLE CODE (DTC) P0705 WILL SET WHEN
^ Ignition is "ON."
^ PRNDL inputs status indicators (P, A, B, C) indicate an incorrect combination of low and high for a minimum of 10 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
When an invalid combination is detected (even before DTC P0705 is set) the PCM assumes the gear select lever is in the drive-4 position, scan data does not change.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This step checks for proper operation of the transmission range switch.
2. This test checks for an open or grounded circuit. When DTC P0705 is present.

DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation.

Check For:

Poor Connection or Damaged Harness
Inspect PCM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.

Intermittent Test
Monitor a Tech 1 while moving related connectors and wiring harness. If the failure is induced, the scan data will change from low to high or high to low. This may help to isolate the location of the malfunction.