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 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.
• | 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). |
The combination of TR switch signals is invalid for 5 seconds. Refer to the Transmission Range Switch Logic table.
• | 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. |
• | 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. |
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 | No | ||||||||||||||
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1 | Did you perform the Powertrain Diagnostic System Check? | -- | Go to Diagnostic System Check - Engine Controls in Engine Controls | |||||||||||||||
2 |
Does each selected transmission range match the scan tool TR Sw. display? | -- | Go to Intermittent Conditions in Engine Controls | |||||||||||||||
3 |
Did you find and correct a condition? | -- | ||||||||||||||||
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? | -- | ||||||||||||||||
Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states? | -- | |||||||||||||||||
Does the voltage measure within the specified value at all four terminals? | 10-12 V | |||||||||||||||||
Connect a fused jumper wire from terminal D of the TR switch 4-way connector (signal A circuit) to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the signal A circuit (CKT 771) is grounded, do any other signal circuits indicate LOW? | -- | |||||||||||||||||
Connect a fused jumper wire from terminal B of the TR switch 4-way connector (signal B circuit) to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the signal B circuit (CKT 772) is grounded, do any other signal circuits indicate LOW? | -- | |||||||||||||||||
Connect a fused jumper wire from terminal C of the TR switch 4-way connector (signal C circuit) to ground while monitoring the scan tool TR Sw. A/B/C/P parameter. When the signal C circuit (CKT 773) is grounded, do any other signal circuits indicate LOW? | -- | |||||||||||||||||
10 | Test the signal circuit(s) (CKTs 771, 772, 773 and 776) of the TR switch that did not indicate HI for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||||||||||
11 | Test the signal circuit(s) (CKTs 771, 772, 773 and 776) of the TR switch that did not indicate proper voltage for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||||||||||
12 | Test the affected signal circuits of the TR switch for a shorted together condition. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||||||||||
13 | Test the ground circuit (CKT 451) of the TR switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||||||||||
14 | Replace the TR switch. The TR switch is part of the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement . Did you complete the replacement? | -- | -- | |||||||||||||||
15 | Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls. Did you complete the replacement? | -- | -- | |||||||||||||||
16 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK |