P0705

DTC P0705





Circuit Description
The park/neutral position (PNP) switch is mounted on the transmission manual shaft. The PNP switch is a multi-signal switch. The fuse block-underhood supplies ignition voltage to the PNP switch on four signal circuits, A, B, C, and P. Each gear selector lever position powers two or more of the signal circuits in a unique pattern. In order to determine the gear range selected by the driver, the transmission control module (TCM) compares the voltage combination on the signal circuits to a transmission range (TR) switch combination table stored in memory.
When the TCM detects an invalid combination of TR switch signals, DTC P0705 sets. DTC P0705 is a type C DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0705 Transmission Range (TR) Switch Circuit

Conditions for Running the DTC
The engine run time is greater than 5 seconds.

Conditions for Setting the DTC
The combination of TR switch signals is invalid for 20 seconds.

Action Taken When the DTC Sets
^ The TCM does not request the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
^ The TCM commands an alternate coast shift pattern when downshifts occur at higher vehicle speeds while coasting.
^ The TCM requests the ECM to illuminate the service vehicle soon (SVS) lamp.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0705 in TCM history.

Conditions for Clearing the SVS Lamp/DTC
^ The TCM clears the SVS lamp request when the condition no longer exists.
^ A scan tool can clear the SVS Lamp/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.

Test Description











The numbers below refer to the step numbers on the diagnostic table.
5. By disconnecting the PNP switch, the voltage supply for all TR switch circuits would be removed and the TCM should recognize all circuits as open. The scan tool should display LOW for all range signals.
6. This step tests the PNP switch wiring for an open or lack of a ground path from the TCM.
7. This step tests the PNP switch wiring and the TCM by providing a voltage supply through a fused jumper wire. When voltage is applied, the scan tool range signal A should change to HI.
8. This step tests the PNP switch wiring and the TCM by providing a voltage supply through a fused jumper wire. When voltage is supplied, the scan tool range signal B should change to HI.
9. This step tests the PNP switch wiring and the TCM by providing a voltage supply through a fused jumper wire. When voltage is applied, the scan tool range signal C should change to HI.