MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0820

DTC Code DTC Name
P0820 Gear Lever "X-Y" Position Sensor Circuit

DESCRIPTION

The transmission control ECU detects the shift lever position using the shift lever position sensor. The shift lever position sensor has two functions; detection and monitoring.

The shift lever position sensor consists of a Link 1 circuit that detects the shift lever positions, R, N, E and M, and a Link 2 circuit that detects the "+" and "-" positions. The circuits are connected to the shift lever via the respective links. The contact switches (6-contact switch for Link 1, and 2-contact switch for Link 2) of the circuits turn on and off in accordance with the fore-aft movement of the shift lever. The transmission control ECU detects the present shift lever position in accordance with the ON/OFF status of these contact switches. The transmission shift main switch detects the side-to-side movement of the shift lever. It turns off when the shift lever is in the R, N, or E position, and turns on in the M, "+", or "-" position.

The shift lever position sensor and the transmission shift main switch convert the shift lever position into electric signals and output them to the transmission control ECU. The transmission control ECU detects the present shift lever position from these signals and operates the actuators to change the gear position.

Contact Points Shift Lever Position
R N E M - +
Link 1 LSRC OFF ON ON ON ON ON
LSWR ON OFF OFF OFF OFF OFF
LSSC ON ON OFF OFF OFF OFF
LSWS OFF OFF ON ON ON ON
LSNC ON OFF ON ON ON ON
LSWN OFF ON OFF OFF OFF OFF
Link 2 LSW- OFF OFF OFF OFF ON OFF
LSW+ OFF OFF OFF OFF OFF ON
Transmission Shift Main Switch OFF OFF OFF ON ON ON

Tech Tips

The monitor runs when the shift lever is moved through each position (N, R, E, M, - and +).

A013772E03
A01388FE07
A01361OE06
DTC No. DTC Detection Condition Trouble Area
P0820

The transmission control ECU detects one of the following conditions:

(1-trip detection logic)


  1. Both the LSW4 (LSWN) signal and the LS4C (LSNC) signal are OFF for 5.0 seconds.

  2. Both the LSW4 (LSWN) signal and the LS4C (LSNC) signal are ON for 30.0 seconds.

  3. The condition that both the LSW4 (LSWN) signal and the LS4C (LSNC) signal are ON for 15.0 seconds or more is detected 5 times.

  • Shift lever position sensor

  • Wire harness or connector

  • Transmission control ECU

The transmission control ECU detects one of the following conditions:

(1-trip detection logic)


  1. Both the LSW3 (LSWS) signal and the LS3C (LSSC) signal are OFF for 5.0 seconds.

  2. Both the LSW3 (LSWS) signal and the LS3C (LSSC) signal are ON for 30.0 seconds.

  3. The condition that both the LSW3 (LSWS) signal and the LS3C (LSSC) signal are ON for 15.0 seconds or more is detected 5 times.

The transmission control ECU detects one of the following conditions:

(1-trip detection logic)


  1. Both the LSW2 (LSWR) signal and the LS2C (LSRC) signal are OFF for 5.0 seconds.

  2. Both the LSW2 (LSWR) signal and the LS2C (LSRC) signal are ON for 30.0 seconds.

  3. The condition that both the LSW2 (LSWR) signal and the LS2C (LSRC) signal are ON for 15.0 seconds or more is detected 5 times.

The transmission control ECU detects the following conditions simultaneously:

(1-trip detection logic)


  1. Shift lever in N or R.

  2. LSW1 (LSW+) signal or LSW5 (LSW-) signal is ON for 1.0 second.

WIRING DIAGRAM

A01360YE02

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (SHIFT LEVER SWITCH AND SHIFT LEVER CHECK SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Multi-Mode M/T / Data List / Shift Lever Switch Signal 1 - 5, and Shift Lever Check Signal 1 - 3.

    5. Check that the normal condition specified in the following table is shown on the display when moving the shift lever to each position R, N, E, M, +, and -.

      Multi- Mode M/T
      Tester Display Measurement Item/ Range Normal Condition Diagnostic Note

      Shift Lever Switch Signal1

      [Shift SW Sig1]

      Shift lever switch signal (+):

      Open (OFF) or Gnd (ON)

      Gnd: Shift lever position in (+)

      Open: Other than above

      		 LSW1 (LSW+) terminal signal of transmission control ECU

      Shift Lever Switch Signal2

      [Shift SW Sig2]

      Shift lever switch signal (R):

      Open (OFF) or Gnd (ON)

      Gnd: Shift lever position in (R)

      Open: Other than above

      		 LSW2 (LSWR) terminal signal of transmission control ECU

      Shift Lever Switch Signal3

      [Shift SW Sig3]

      Shift lever switch signal (M) or (E):

      Open (OFF) or Gnd (ON)

      Gnd: Shift lever position in (E), (M), (+) or (-)

      Open: Shift lever position in (R) or (N)

      		 LSW3 (LSWS) terminal signal of transmission control ECU

      Shift Lever Switch Signal4

      [Shift SW Sig4]

      Shift lever switch signal (N):

      Open (OFF) or Gnd (ON)

      Gnd: Shift lever position in (N)

      Open: Other than above

      		 LSW4 (LSWN) terminal signal of transmission control ECU

      Shift Lever Switch Signal5

      [Shift SW Sig5]

      Shift lever switch signal (-):

      Open (OFF) or Gnd (ON)

      Gnd: Shift lever position in (-)

      Open: Other than above

      		 LSW5 (LSW-) terminal signal of transmission control ECU

      Shift Lever Check Signal1

      [Shift Chek Sig1]

      Check signal of shift lever switch signal 2:

      Open (ON) or Gnd (OFF)

      Gnd: Shift lever position in (R)

      Open: Other than above

      LS2C (LSRC) terminal signal of transmission ECU

      Reversal signal of LSW2 (LSWR)

      (ON and OFF reversed)

      Shift Lever Check Signal2

      [Shift Chek Sig2]

      Check signal of shift lever switch signal 3:

      Open (ON) or Gnd (OFF)

      Gnd: Shift lever position in (E), (M), (+) or (-)

      Open: Shift lever position in (R) or (N)

      LS3C (LSSC) terminal signal of transmission control ECU

      Reversal signal of LSW3 (LSWS)

      (ON and OFF reversed)

      Shift Lever Check Signal3

      [Shift Chek Sig3]

      Check signal of shift lever switch signal 4:

      Open (ON) or Gnd (OFF)

      Gnd: Shift lever position in (N)

      Open: Other than above

      LS4C (LSNC) terminal signal of transmission ECU

      Reversal signal of LSW4 (LSWN)

      (ON and OFF reversed)
      OK
      When the shift lever is operated, the normal condition listed above is shown on the tester.

    NG

    INSPECT SHIFT LEVER POSITION SENSOR (SHIFT LEVER POSITION SENSOR) Click here

    OK

    SYMPTOM SIMULATION AND DTC CHECK Click here

  2. INSPECT SHIFT LEVER POSITION SENSOR (SHIFT LEVER POSITION SENSOR)


    1. A01384GE04
      Text in Illustration
      *a

      Component without harness connected

      (Shift Lever Position Sensor)

      Disconnect the C39 shift lever position sensor connector.

    2. Measure the resistance according to the value(s) in the table below.

      Tech Tips

      The shift lever position sensor connector has no terminals in locations of 1, 8, 7, and 14.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (LSRC) - 3 (LSWS)

      Shift lever in

      E, M, "+" or "-"

      		 Below 1 Ω
      2 (LSRC) - 13 (LSNC) Below 1 Ω
      3 (LSWS) - 4 (COM1) Below 1 Ω
      3 (LSWS) - 11 (COM2) Below 1 Ω
      2 (LSRC) - 4 (COM1)

      Shift lever in

      N, E, M, "+" or "-"

      		 Below 1 Ω
      2 (LSRC) - 11 (COM2) Below 1 Ω
      2 (LSRC) - 6 (LSWN)

      Shift lever in

      N

      		 Below 1 Ω
      2 (LSRC) - 10 (LSSC) Below 1 Ω
      4 (COM1)- 6 (LSWN) Below 1 Ω
      6 (LSWN) - 10 (LSSC) Below 1 Ω
      6 (LSWN) - 11 (COM2) Below 1 Ω
      4 (COM1) - 5 (LSW+)

      Shift lever in

      "+"

      		 Below 1 Ω
      5 (LSW+) - 11 (COM2) Below 1 Ω
      4 (COM1) - 9 (LSWR)

      Shift lever in

      R

      		 Below 1 Ω
      9 (LSWR) - 10 (LSSC) Below 1 Ω
      9 (LSWR) - 11 (COM2) Below 1 Ω
      9 (LSWR) - 13 (LSNC) Below 1 Ω
      10 (LSSC) - 13 (LSNC) Below 1 Ω
      4 (COM1) - 10 (LSSC)

      Shift lever in

      R or N

      		 Below 1 Ω
      10 (LSSC) - 11 (COM2) Below 1 Ω
      4 (COM1) - 11 (COM2) Always Below 1 Ω
      4 (COM1) - 12 (LSW-)

      Shift lever in

      "-"

      		 Below 1 Ω
      11 (COM2) - 12 (LSW-) Below 1 Ω
      4 (COM1) - 13 (LSNC)

      Shift lever in

      R, E, M, "+" or "-"

      		 Below 1 Ω
      11 (COM2) - 13 (LSNC) Below 1 Ω

    NG

    REPLACE SHIFT LEVER POSITION SENSOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SHIFT LEVER POSITION SENSOR - TRANSMISSION CONTROL ECU)


    1. Disconnect the A27 transmission control ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-11 (LS4C) - C39-13 (LSNC) Always Below 1 Ω
      A27-12 (LS3C) - C39-10 (LSSC) Always Below 1 Ω
      A27-13 (LS2C) - C39-2 (LSRC) Always Below 1 Ω
      A27-15 (LSW5) - C39-12 (LSW-) Always Below 1 Ω
      A27-16 (LSW4) - C39-6 (LSWN) Always Below 1 Ω
      A27-17 (LSW3) - C39-3 (LSWS) Always Below 1 Ω
      A27-18 (LSW2) - C39-9 (LSWR) Always Below 1 Ω
      A27-19 (LSW1) - C39-5 (LSW+) Always Below 1 Ω
      A27-11 (LS4C) - Body ground Always 10 kΩ or higher
      A27-12 (LS3C) - Body ground Always 10 kΩ or higher
      A27-13 (LS2C) - Body ground Always 10 kΩ or higher
      A27-15 (LSW5) - Body ground Always 10 kΩ or higher
      A27-16 (LSW4) - Body ground Always 10 kΩ or higher
      A27-17 (LSW3) - Body ground Always 10 kΩ or higher
      A27-18 (LSW2) - Body ground Always 10 kΩ or higher
      A27-19 (LSW1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (SHIFT LEVER POSITION SENSOR - BODY GROUND)


    1. A01365TE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Shift Lever Position Switch)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C39-4 (COM1) - Body ground Always Below 1 Ω
      C39-11 (COM2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TRANSMISSION CONTROL ECU


    1. Replace the transmission control ECU Click here.


    NEXT

  6. PERFORM INITIALIZATION


    1. Perform the initialization and learning for multi-mode manual transaxle system Click here.


    NEXT

    END