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Home >> Toyota >> 2004 >> MR2 C56 >> Repair and Diagnosis >> Transmission >> Manual Trans >> Manual Trans Sequential - Diagnostics >> DTC P0850: Park/Neutral Switch Input Circuit >> Inspection Procedure

Inspection Procedure

  1. Check gear and shift position. 

    PREPARATION: 

    1. Turn the ignition switch ON.
    2. Connect the hand-held tester to the DLC3.

    CHECK: 

    When the shift is in N, 1, 2 and R, check the shift and select lever shaft position, gear position, shift position indicator and the value shown in the tester.

    OK: 

    1. All of them show the same value in each shift position. 
    1. OK: Go to step   5 
    2. NG: Go to next step 
  2. Check for open or short in harness and connector between shift stroke sensor and transmission control ECU ( PROCEDURE  ). 
    1. NG: Repair or replace harness and connector. 
    2. OK: Go to next step 
  3. Inspect shift stroke sensor. 

    PREPARATION: 

    Remove the shift stroke sensor.

    CHECK: 

    Check the voltage of the shift stroke sensor.

    1. Connect 3 dry cell batteries (1.5 V) in series.
    2. Connect the battery positive (+) wire to terminal A and the battery negative (-) wire to terminal C.
    3. Check the voltage between terminals C and B when moving the link.
    Fig 1: Checking Voltage B/W Terminals C And B
    G02914057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    1. Voltage (Power source voltage at 4.5 V): 
    SENSOR ANGLE AND TERMINAL OUTPUT VOLTAGE

    Sensor Angle (degree) Terminal (C - B) Output Voltage (V)
    44.8 4.127 - 4.306
    135.5 0.185 - 0.364

    HINT:

    Formula when the power source voltage has changed.

    (4V less than or equal to power source, less than or equal 6V)

    SENSOR ANGLE OUTPUT VOLTAGE

    Sensor Angle (degree) Output Voltage (V)
    44.8 Power source x (0.937 +/- 0.02)
    135.5 Power source x (0.061 x(0.061 +/- 0.02)
    1. NG: Replace shift stroke sensor. 
    2. OK: Go to next step 
  4. Inspect GSA installation ( REMOVAL  ). 
    1. NG: Repair or replace GSA assembly or shift and select lever shaft. 
    2. OK: Replace transmission control ECU. 
  5. Connect hand-held tester, and read value of transmission park/neutral position switch. 

    PREPARATION: 

    1. Turn the ignition switch ON.
    2. Connect the hand-held tester to the DLC3.

    CHECK: 

    Read the park/neutral position switch value using the hand-held tester.

    OK: 

    PARK/NEUTRAL POSITION SWITCH VALUE

    Shift Position Neutral Switch Value
    Neutral ON
    R OFF
    1. OK: Replace transmission control ECU. 
    2. NG: Go to next step 
  6. Check for open or short in harness and connector between body ground and park/neutral position switch, and transmission control ECU and park/neutral position switch ( PROCEDURE  ). 
    1. NG: Repair or replace harness and connector. 
    2. OK: Go to next step 
  7. Inspect park/neutral position switch. 

    PREPARATION: 

    Remove the park/neutral position switch.

    CHECK: 

    Check the continuity between terminals of the neutral start switch.

    OK: 

    1. Continuity: 
    Fig 2: Park/Neutral Position Switch Specified Condition Table
    G02914058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    PARK/NEUTRAL POSITION SWITCH SPECIFIED CONDITION

    Switch Position Specified Condition
    Free No continuity
    Push Continuity
    1. NG: Replace park/neutral position switch. 
    2. OK: Replace transmission control ECU. 
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