Inhibitor Switch: Inspection

WARNING: This page is about a different car, the 2020 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

When the driving condition or starter motor operation is improper, first check the shift linkage for improper operation. If the shift linkage is functioning properly, check the inhibitor switch.

Disconnect the ground terminal from 12V engine restart battery sensor. Refer to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
Remove the clip from the air intake boot, and loosen the clamp.

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Remove the air intake boot, and place it aside so that it does not interfere with the work.
NOTE: Be careful not to pull out the PCV hose.

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Remove the transmission radio ground terminal.

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Disconnect the transmission harness connector.

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Remove the transmission case cover (small).

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Move the lock lever in the arrow direction while pressing the lock button, and disconnect the connector.

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Set the ST between the TCM and transmission harness. Refer to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>GENERAL DESCRIPTION>CAUTION .
Preparation tool:

ST: CHECK BOARD (18460AA040)

Check for continuity in inhibitor switch circuit by shifting the select lever in "P", "R", "N" and "D" respectively.

NOTE:

Check that there is no continuity in the starter circuit when the select lever is in the "R" and "D" ranges.
When inhibitor switch is normal, check there is no poor contact in vehicle side connector and no open circuit in harness.

	Range	Terminal No.	Standard
Signal sent to TCM	P	38 - 42	Less than 1 Ω
	R	37 - 42
	N	36 - 42
	D	35 - 42

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	Range	Terminal No.	Standard
Starter signal	P/N	1 - 5	Less than 1 Ω
Back-up light circuit	R	22 - 26	Less than 1 Ω

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Check that there is continuity at equal points when the select lever is moved 1.5° in both directions from the "N" range.
If there is continuity in only one direction or in other points, adjust the inhibitor switch. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>INHIBITOR SWITCH>ADJUSTMENT .

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Repeat the above inspection in other gear ranges. If there is fault, adjust the inhibitor switch and select cable. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>INHIBITOR SWITCH>ADJUSTMENT . Refer to CONTROL SYSTEMS>SELECT CABLE>ADJUSTMENT .