4T40-E / 4T45-E Automatic Transaxle

DTC P0705





Test 1-6





Test 7-16

Circuit Description with 4T40-E / 4T45-E Automatic Transaxle
The Transmission Range (TR) switch is part of the park/neutral position and back-up lamp switch assembly and is mounted on the transmission manual shaft. The TR switch is a multi-signal switch. The PCM supplies ignition voltage to the TR switch on four signal circuits (A, B. C, and P). Each gear selector lever position grounds one or more of the signal circuits in a unique pattern. In order to determine the gear range selected by the driver, the PCM compares the voltage combination on the signal circuits to a TR switch combination table stored in memory. Refer to Transmission Flange Switch Logic.
When the PCM detects an invalid combination of TR switch signals, then DTC P0705 sets. DTC P0705 is a type C DTC.

Conditions for Running the DTC
^ The system voltage is 8 - 18 volts.
^ The engine run time is greater than 5 seconds.
^ The vehicle speed is greater than 8 km/h (5 mph).

Conditions for Setting the DTC
The combination of TR switch signals is invalid for 5 seconds. Refer to the Transmission Range Switch Logic table.

Action Taken When the DTC Sets
^ The PCM does not illuminate the malfunction indicator lamp (MIL).
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
^ The PCM stores DTC P0705 in PCM history. Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and the DTC passes.

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