Circuit Description
The transmission range (TR) switch is part of the park/neutral position switch and is mounted on the transmission manual shaft. The TR switch is a multi-signal switch. The transmission control module (TCM) 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 TCM compares the voltage combination on the signal circuits to a TR switch combination table stored in memory. Refer to Transmission Range Switch Logic .
When the TCM detects an invalid combination of TR switch signals, then 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 60 seconds. Refer to Transmission Range Switch Logic .
Action Taken When the DTC Sets
| • | The TCM does not illuminate the malfunction indicator lamp (MIL). |
| • | The TCM commands an alternate coast shift pattern where downshifts occur at higher vehicle speeds while coasting. |
| • | 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 DTC
| • | A scan tool can clear the DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring. |
| • | The TCM 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.
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By disconnecting the TR switch, the ground path for all TR switch circuits would be removed and the TCM should recognize all circuits as open. The scan tool should display HI for all range signals.
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This step tests the TR switch wiring for an open or lack of signal voltage from the TCM.
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This step tests the TR switch wiring and the TCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal A should change to LOW.
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This step tests the TR switch wiring and the TCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal B should change to LOW.
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This step tests the TR switch wiring and the TCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal C should change to LOW.
Step | Action | Value(s) | Yes | No | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||
2 |
Does each selected transmission range match the scan tool TR Sw. display? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||||||||
3 |
Did you find and correct a condition? | -- | Go to Step 16 | Go to Step 4 | ||||||||||||
4 | With the scan tool, observe the TR Sw. A/B/C/P display. Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states? | -- | Go to Step 13 | Go to Step 5 | ||||||||||||
Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states? | -- | Go to Step 6 | Go to Step 10 | |||||||||||||
Does the voltage measure within the specified value at all four terminals? | 10-12 V | Go to Step 7 | Go to Step 11 | |||||||||||||
Connect a fused jumper wire from the TR signal A circuit of the PNP switch connector to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the TR signal A circuit is grounded, do any other signal circuits indicate LOW? | -- | Go to Step 12 | Go to Step 8 | |||||||||||||
Connect a fused jumper wire from the TR signal B circuit of the PNP switch connector to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the TR signal B circuit is grounded, do any other signal circuits indicate LOW? | -- | Go to Step 12 | Go to Step 9 | |||||||||||||
Connect a fused jumper wire from the TR signal C circuit of the PNP switch connector to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the TR signal C circuit is grounded, do any other signal circuits indicate LOW? | -- | Go to Step 12 | Go to Step 14 | |||||||||||||
10 | Test the TR signal circuits of the PNP switch that did not indicate HI for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||||||||
11 | Test the TR signal circuits of the PNP switch that did not indicate proper voltage for an open. Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||||||||
12 | Test the affected TR signal circuits of the PNP switch for a shorted together condition. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||||||||
13 | Test the ground circuit of the PNP switch for an open. Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||||||||
14 | Replace the PNP switch. Refer to Park/Neutral Position Switch Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||||
15 | Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||||
16 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 17 | Go to Step 2 | ||||||||||||
17 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |
