DTC P0705. Pontiac Grand Am 2006

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2006 🢒 Grand Am 🢒 DTC 🢒 DTC P0705

Master Electrical Component List
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice

Circuit Description

The transmission range (TR) switch is part of the park/neutral position (PNP) switch and is mounted on the transmission manual shaft. The TR switch is a multi-signal switch. The powertrain control module (PCM) supplies ignition voltage to the TR switch on 4 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 Range Switch Logic .

When the PCM 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 is running for greater than 5 seconds and not in fuel cut off.

•	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 20 seconds. Refer to Transmission Range Switch Logic .

Action Taken When the DTC Sets

•	The PCM does not illuminate the malfunction indicator lamp (MIL).

•	The PCM commands an alternate coast shift pattern where downshifts occur at higher speeds while coasting.

•	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.

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.

This step tests the TR switch wiring for an open or lack of signal voltage from the PCM.

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.

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.

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.

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Install a scan tool.
Turn ON the ignition, with the engine OFF.
Select TR Sw. on the scan tool.
With the scan tool, observe the TR Sw. display while selecting each transmission range: P, R, N, D4, D3, D2 and D1.

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

Inspect the PNP switch assembly for the following:

•

Damage

•	Loose or missing mounting hardware

•	Proper adjustment

•	Refer to Park/Neutral Position Switch Replacement .

Inspect the shift cable for the following:

•	Damaged or stretched cable

•	Proper adjustment

•	Refer to Transmission Control Replacement .

Did you find and correct a condition?

Go to Step 16

Go to Step 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

Turn OFF the ignition.
Disconnect the PNP switch connector.
Turn ON the ignition, with the engine OFF.

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

Using the DMM and the J 35616 GM-approved terminal test kit, measure the voltage from the TR signal A circuit of the PNP switch connector to ground.
Measure the voltage from the TR signal B circuit of the PNP switch connector to ground.
Measure the voltage from the TR signal C circuit of the PNP switch connector to ground.
Measure the voltage from the TR signal P circuit of the PNP switch connector to ground.

Does the voltage measure within the specified value at all 4 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

Test the TR signal circuit or circuits of the TR 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

Test the TR signal circuit or circuits of the TR 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