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Home >> Subaru >> 2006 >> Baja Turbo, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Automatic Transmission Diagnostics (4AT) (H4SO)) >> Diagnostic Procedure without Diagnostic Trouble Code (DTC) >> Check Inhibitor Switch

Check Inhibitor Switch

WARNING: This page is about a different variant/trim than selected.

DIAGNOSIS: 

The input signal circuit of inhibitor switch is open or shorted.

TROUBLE SYMPTOM: 

WIRING DIAGRAM: 

Fig 1: Inhibitor Switch - Wiring Diagram
G04990745Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE CHART

Step Check Yes No
1 CHECK "P" RANGE SWITCH.  When the "P" range is selected, does LED light up? Go to step 2.  Go to step 22. 
2 CHECK INDICATOR LIGHT.  Does the combination meter "P" range indicator illuminate? Go to step 3.  Go to step 26. 
3 CHECK "P" RANGE SWITCH.  When the "R" range is selected, does "P" range LED light up? Go to step 28.  Go to step 4. 
4 CHECK "R" RANGE SWITCH.  When the "R" range is selected, does LED light up? Go to step 5.  Go to step 29. 
5 CHECK INDICATOR LIGHT.  Does the combination meter "R" range indicator illuminate? Go to step 6.  Go to step 32. 
6 CHECK "R" RANGE SWITCH.  When the "N" range is selected, does "R" range LED light up? Go to step 34.  Go to step 7. 
7 CHECK "N" RANGE SWITCH.  When the "N" range is selected, does LED light up? Go to step 8.  Go to step 35. 
8 CHECK INDICATOR LIGHT.  Does the combination meter "N" range indicator illuminate? Go to step 9.  Go to step 38. 
9 CHECK "N" RANGE SWITCH.  When the "D" range is selected, does "N" range LED light up? Go to step 40.  Go to step 10. 
10 CHECK "D" RANGE SWITCH.  When the "D" range is selected, does LED light up? Go to step 11.  Go to step 41. 
11 CHECK INDICATOR LIGHT.  Does the combination meter "D" range indicator illuminate? Goto step 12.  Go to step 44. 
12 CHECK "D" RANGE SWITCH.  When the "3" range is selected, does "D" range LED light up? Go to step 46.  Go to step 13. 
13 CHECK "3" RANGE SWITCH.  When the "3" range is selected, does LED light up? Goto step 14.  Go to step 47. 
14 CHECK INDICATOR LIGHT.  Does the combination meter "3" range indicator illuminate? Go to step 15.  Go to step 50. 
15 CHECK "3" RANGE SWITCH.  When the "2" range is selected, does "3" range LED light up? Go to step 52.  Go to step 16. 
16 CHECK "2" RANGE SWITCH.  When the "2" range is selected, does LED light up? Go to step 17.  Go to step 53. 
17 CHECK INDICATOR LIGHT.  Does the combination meter "2" range indicator illuminate? Go to step 18.  Go to step 56. 
18 CHECK "2" RANGE SWITCH.  When the "1" range is selected, does "2" range LED light up? Go to step 58.  Go to step 19. 
19 CHECK "1" RANGE SWITCH.  When the "1" range is selected, does LED light up? Go to step 20.  Go to step 59. 
20 CHECK INDICATOR LIGHT.  Does the combination meter "1" range indicator illuminate? Go to step 21.  Go to step 62. 
21 CHECK "1" RANGE SWITCH.  When the "2" range is selected, does "1" range LED light UP? Go to step 64.  Go to Symptom Related Diagnostic. < Ref. to SYMPTOM RELATED DIAGNOSTIC . >
22 CHECK HARNESS CONNECTOR BETWEEN INHIBITOR SWITCH AND CHASSIS GROUND. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from inhibitor switch.
  3. Measure the resistance of harness between inhibitor switch and chassis ground.

    Connector & terminal 

    (T7) No. 5 - Chassis ground: 

 Is the resistance less than 1 Ω? Go to step 23.  Repair the open circuit in harness between inhibitor switch connector and chassis ground, and poor contact in coupling connector.
23 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM and inhibitor switch.
  3. Measure the resistance of harness between TCM and inhibitor switch connector.

    Connector & terminal 

    (BSS) No. 23 - (17) No. 9: 

 Is the resistance less than 1 Ω? Go to step 24.  Repair the open circuit in harness between TCM and inhibitor switch connector, and poor contact in coupling connector.
24 CHECK INPUT SIGNAL FOR TCM. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector to TCM and inhibitor switch.
  3. Turn the ignition switch to ON.
  4. Move the select lever to "P" range.
  5. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 23 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 25.  Go to step 65. 
25 CHECK INPUT SIGNAL FOR TCM. 
  1. Position the select lever to any other than "P" range.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (BSS) No. 23 (+) - Chassis ground (-): 

 Is the voltage more than 8 V? Go to step 65.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
26 CHECK "P" RANGE INDICATOR LIGHT BULB. 
  1. Turn the ignition switch to OFF.
  2. Remove the combination meter.
  3. Remove the "P" range indicator light bulb from combination meter.
 Is the "P" range indicator light bulb OK? Go to step 27.  Replace the "P" range indicator light bulb. < Ref. to COMBINATION METER ASSEMBLY . >
27 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
  1. Disconnect the connectors from TCM and combination meter.
  2. Measure the resistance of harness between TCM and combination meter.

    Connector & terminal 

    (B55) No. 23 - (i11) No. 1: 

 Is the resistance more than 1 Ω? Go to step 65.  Repair the open circuit in harness between TCM connector and combination meter, and poor contact in coupling connector.
28 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM, inhibitor switch and combination meter.
  3. Measure the resistance of harness between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 23 - Chassis ground: 

 Is the resistance less than 1 MΩ? Go to step 29.  Repair the ground short circuit in "P" range circuit.
29 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM and inhibitor switch.
  3. Measure the resistance of harness between TCM and inhibitor switch connector.

    Connector & terminal 

    (B55) No. 17 - (T7) No. 8: 

 Is the resistance less than 1 Ω? Go to step 30.  Repair the open circuit in harness between TCM and inhibitor switch connector, and poor contact in coupling connector.
30 CHECK INPUT SIGNAL FOR TCM. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector to TCM and inhibitor switch.
  3. Turn the ignition switch to ON.
  4. Move the select lever to "R" range.
  5. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 17 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 31.  Go to step 65. 
31 CHECK INPUT SIGNAL FOR TCM. 
  1. Position the select lever to any other than "R" range.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 17 (+) - Chassis ground (-): 

 Is the voltage more than 8 V? Go to step 65.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
32 CHECK "R" RANGE INDICATOR LIGHT BULB. 
  1. Turn the ignition switch to OFF.
  2. Remove the combination meter.
  3. Remove the "R" range indicator light bulb from combination meter.
 Is "R" range indicator light bulb OK? Go to step 33.  Replace the "R" range indicator light bulb. < Ref. to COMBINATION METER ASSEMBLY . >
33 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
  1. Disconnect the connectors from TCM and combination meter.
  2. Measure the resistance of harness between TCM and combination meter.

    Connector & terminal 

    (B55) No. 17 - (i11) No. 2: 

 Is the resistance less than 1 Ω? Go to step 65.  Repair the open circuit in harness between TCM connector and combination meter, and poor contact in TCM connector.
34 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM, inhibitor switch and combination meter.
  3. Measure the resistance of harness between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 17 - Chassis ground: 

 Is the resistance more than 1 MΩ? Go to step 35.  Repair the ground short circuit in "R" range circuit.
35 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM and inhibitor switch.
  3. Measure the resistance of harness between TCM and inhibitor switch connector.

    Connector & terminal 

    (B55) No. 22 - (T7) No. 10: 

 Is the resistance less than 1 Ω? Go to step 36.  Repair the open circuit in harness between TCM and inhibitor switch connector, and poor contact in coupling connector.
36 CHECK INPUT SIGNAL FOR TCM. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector to TCM and inhibitor switch.
  3. Turn the ignition switch to ON.
  4. Move the select lever to "N" range.
  5. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 22 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 37.  Go to step 65. 
37 CHECK INPUT SIGNAL FOR TCM. 
  1. Position the select lever to any other than "N" range.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (BSS) No. 22 (+) - Chassis ground (-): 

 Is the voltage more than 8 V? Go to step 65.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
38 CHECK "N" RANGE INDICATOR LIGHT BULB. 
  1. Turn the ignition switch to OFF.
  2. Remove the combination meter.
  3. Remove the "N" range indicator light bulb from combination meter.
 Is the "N" range indicator light bulb OK? Go to step 39.  Replace the "N" range indicator light bulb. < Ref. to COMBINATION METER ASSEMBLY . >
39 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
  1. Disconnect the connectors from TCM and combination meter.
  2. Measure the resistance of harness between TCM and combination meter.

    Connector & terminal 

    (B55) No. 22 - (i11) No. 3: 

 Is the resistance less than 1 Ω? Go to step 65.  Repair the open circuit in harness between TCM connector and combination meter, and poor contact in TCM connector.
40 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM, inhibitor switch and combination meter.
  3. Measure the resistance of harness between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 22 - Chassis ground: 

 Is the resistance more than 1 MΩ? Go to step 41.  Repair the ground short circuit in "N" range circuit.
41 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM and inhibitor switch.
  3. Measure the resistance of harness between TCM and inhibitor switch connector.

    Connector & terminal 

    (BSS) No. 8 - (T7) No. 3: 

 Is the resistance less than 1 Ω? Go to step 42.  Repair the open circuit in harness between TCM and inhibitor switch connector, and poor contact in coupling connector.
42 CHECK INPUT SIGNAL FOR TCM. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector to TCM and inhibitor switch.
  3. Turn the ignition switch to ON.
  4. Move the select lever to "D" range.
  5. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 8 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 43.  Go to step 65. 
43 CHECK INPUT SIGNAL FOR TCM. 
  1. Position select lever to any other than "D" range.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 8 (+) - Chassis ground (-): 

 Is the voltage more than 8 V? Go to step 65.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
44 CHECK "D" RANGE INDICATOR LIGHT BULB. 
  1. Turn the ignition switch to OFF.
  2. Remove the combination meter.
  3. Remove the "D" range indicator light bulb from combination meter.
 Is the "D" range indicator light bulb OK? Go to step 45.  Replace the "D" range indicator light bulb. < Ref. to COMBINATION METER ASSEMBLY . >
45 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
  1. Disconnect the connectors from TCM and combination meter.
  2. Measure the resistance of harness between TCM and combination meter.

    Connector & terminal 

    (B55) No. 8 - (i11) No. 4: 

 Is the resistance less than 1 Ω? Go to step 65.  Repair the open circuit in harness between TCM connector and combination meter, and TCM connector.
46 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM, inhibitor switch and combination meter.
  3. Measure the resistance of harness between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 8 - Chassis ground: 

 Is the resistance more than 1 MΩ? Go to step 47.  Repair the ground short circuit in "D" range circuit.
47 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from TCM and inhibitor switch.
  3. Measure the resistance of harness between TCM and inhibitor switch connector.

    Connector & terminal 

    (B55) No. 18 - (T7) No. 11: 

 Is the resistance less than 1 Ω? Go to step 48.  Repair the open circuit in harness between TCM and inhibitor switch connector, and poor contact in coupling connector.
48 CHECK INPUT SIGNAL FOR TCM. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector to TCM and inhibitor switch.
  3. Turn the ignition switch to ON.
  4. Move the select lever to "3" range.
  5. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 18 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 49.  Go to step 65. 
49 CHECK INPUT SIGNAL FOR TCM. 
  1. Position the select lever to any other than "3" range.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 18 (+) - Chassis ground (-): 

 Is the voltage more than 8 V? Go to step 65.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
50 CHECK "3" RANGE INDICATOR LIGHT BULB. 
  1. Turn the ignition switch to OFF.
  2. Remove the combination meter.
  3. Remove the "3" range indicator light bulb from combination meter.
 Is the "3" range indicator light bulb OK? Go to step 51.  Replace the "3" range indicator light bulb. < Ref. to COMBINATION METER ASSEMBLY . >
51 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
  1. Disconnect the connectors from TCM and combination meter.
  2. Measure the resistance of harness between TCM and combination meter.

    Connector & terminal 

    (B55) No. 18 - (i11) No. 11: 

 Is the resistance more than 1 Ω? Go to step 65.  Repair the open circuit in harness between TCM connector and combination meter, and poor contact in TCM connector.
52 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM, inhibitor switch and combination meter.
  3. Measure the resistance of harness between TCM and chassis ground.

    Connector & terminal 

    (B55) No. 18 - Chassis ground: 

 Is the resistance more than 1 MΩ? Go to step 53.  Repair the ground short circuit in "3" range circuit.
53 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from TCM and inhibitor switch.
  3. Measure the resistance of harness between TCM and inhibitor switch connector.

    Connector & terminal 

    (B54) No. 10 - (T7) No. 4: 

 Is the resistance less than 1 Ω? Go to step 54.  Repair the open circuit in harness between TCM and inhibitor switch connector, and poor contact in coupling connector.
54 CHECK INPUT SIGNAL FOR TCM. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector to TCM and inhibitor switch.
  3. Turn the ignition switch to ON.
  4. Move the select lever to "2" range.
  5. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B54) No. 10 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 55.  Go to step 65. 
55 CHECK INPUT SIGNAL FOR TCM. 
  1. Position the select lever to any other than "2" range.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B54) No. 10 (+) - Chassis ground (-): 

 Is the voltage more than 8 V? Go to step 65.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
56 CHECK "2" RANGE INDICATOR LIGHT BULB. 
  1. Turn the ignition switch to OFF.
  2. Remove the combination meter.
  3. Remove the "2" range indicator light bulb from combination meter.
 Is the "2" range indicator light bulb OK? Go to step 57.  Replace the "2" range indicator light bulb. < Ref. to COMBINATION METER ASSEMBLY . >
57 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
  1. Disconnect the connectors from TCM and combination meter.
  2. Measure the resistance of harness between TCM and combination meter.

    Connector & terminal 

    (B54) No. 10 - (i11) No. 12: 

 Is the resistance less than 1 Ω? Go to step 65.  Repair the open circuit in harness between TCM and combination meter, and poor contact in TCM connector.
58 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM, inhibitor switch and combination meter.
  3. Measure the resistance of harness between TCM and chassis ground.

    Connector & terminal 

    (B54) No. 10 - Chassis ground: 

 Is the resistance more than 1 MΩ? Go to step 59.  Repair the ground short circuit in "2" range circuit.
59 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM and inhibitor switch.
  3. Measure the resistance of harness between TCM and inhibitor switch connector.

    Connector & terminal 

    (B54) No. 1 - (77) No. 6: 

 Is the resistance less than 1 Ω? Go to step 60.  Repair the open circuit in harness between TCM and inhibitor switch connector, and poor contact in coupling connector.
60 CHECK INPUT SIGNAL FOR TCM. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector to TCM and inhibitor switch.
  3. Turn the ignition switch to ON.
  4. Move the select lever to "1" range.
  5. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B54) No. 1 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 61.  Go to step 65. 
61 CHECK INPUT SIGNAL FOR TCM. 
  1. Position the select lever to any other than "1" range.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B54) No. 1 (+) - Chassis ground (-): 

 Is the voltage more than 8 V? Go to step 65.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
62 CHECK "1" RANGE INDICATOR LIGHT BULB. 
  1. Turn the ignition switch to OFF.
  2. Remove the combination meter.
  3. Remove the "1" range indicator light bulb from combination meter.
 Is the "1" range indicator light bulb OK? Go to step 63.  Replace the "1" range indicator light bulb. < Ref. to COMBINATION METER ASSEMBLY . >
63 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. 
  1. Disconnect the connectors from TCM and combination meter.
  2. Measure the resistance of harness between TCM and combination meter.

    Connector & terminal 

    (B54) No.1 - (i11) No. 5: 

 Is the resistance less than 1Ω? Go to step 65.  Repair the open circuit in harness between TCM and combination meter, poor contact in TCM connector.
64 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM, inhibitor switch and combination meter.
  3. Measure the resistance of harness between TCM and chassis ground.

    Connector & terminal 

    (B54) No. 1 - Chassis ground: 

 Is the resistance more than 1 MΩ? Go to step 65.  Repair the ground short circuit in "1" range circuit.
65 CHECK POOR CONTACT.  Is there poor contact in inhibitor switch circuit? Repair the poor contact. Adjust the inhibitor switch and select cable. < Ref. to ADJUSTMENT , INHIBITOR SWITCH > and < Ref. to SELECT CABLE . >
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