Lexus IS250 · Service Manual TRANSMISSION

P0705

Diagnostic trouble codes

DESCRIPTION

The park/neutral position switch detects the shift lever position and sends signals to the ECM.
DTC No.
 DTC Detection Condition
 Trouble Area
P0705
  1. (A) Any 2 or more signals of the following are ON simultaneously (2-trip detection logic)
    1. P input signal is ON.
    2. N input signal is ON
    3. R input signal is ON.
    4. D input signal is ON.
  2. (B) Any 2 or more signals of the following are ON simultaneously (2-trip detection logic)
    1. NSW (STAR) input signal is ON.
    2. R input signal is ON.
    3. D input signal is ON.
  3. (C) When any of following conditions is met for 2.0 sec. or more in the S position (2-trip detection logic)
    1. NSW (STAR) input signal is ON.
    2. P input signal is ON.
    3. N input signal is ON.
    4. R input signal is ON.
  4. (D) All switches are OFF simultaneously for P, R, N and D positions (2-trip detection logic)
  1. Open or short in park/neutral position switch circuit
  2. Park/neutral position switch
  3. ECM

MONITOR DESCRIPTION

These DTCs indicate a problem with the park/neutral position switch and the wire harness in the park/neutral position switch circuit.
The park/neutral position switch detects the shift lever position and sends a signal to the ECM.
For security, the park/neutral position switch detects the shift lever position so that engine can be started only when the shift lever is in the P or N position.
The park/neutral position switch sends a signal to the ECM according to the shift position (P, R, N, D, or S). The ECM determines that there is a problem with the switch or related parts if it receives more than 1 position signal simultaneously. The ECM will turn on the MIL and store the DTC.

WIRING DIAGRAM

C128057E02

INSPECTION PROCEDURE


DATA LIST

HINT:
Using the intelligent tester Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to shorten labor time.

NOTICE:
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

  1. Warm up the engine.

  2. Turn the engine switch off.

  3. Connect the intelligent tester to the DLC3.

  4. Turn the engine switch on (IG) position.

  5. Turn on the tester.

  6. Select the item "Enter / Powertrain / ECT / Data List".

  7. Follow the instructions on the tester and read the Data List.

    Item
    		 Measurement Item/
    Range (display)
    		 Normal Condition
    		 Diagnostic Note
    Neutral Position SW Signal
    		 PNP Switch Status/
    ON or OFF
    		 Shift lever position is;
    P and N: ON
    Except P and N: OFF
    		 When the shift lever position displayed on the Intelligent tester differs from the actual position, adjustment of the PNP switch or the shift cable may be incorrect.
    Shift SW Status (R Range)
    		 PNP Switch Status/
    ON or OFF
    		 Shift lever position is;
    R: ON
    Except R: OFF
    		 ↑
    Shift SW Status (P Range)
    		 PNP Switch Status/
    ON or OFF
    		 Shift lever position is;
    P: ON
    Except P: OFF
    		 ↑
    Shift SW Status (N Range)
    		 PNP Switch Status/
    ON or OFF
    		 Shift lever position is;
    N: ON
    Except N: OFF
    		 ↑
    Shift SW Status (D Range)
    		 PNP Switch Status/
    ON or OFF
    		 Shift lever position is;
    D and S: ON
    Except D and S: OFF
    		 ↑
    Sports Mode Selection SW
    		 Sport Mode Select Switch Status/
    ON or OFF
    		 Shift lever position is;
    S, "+" and "-": ON
    Except S, "+" and "-": OFF
    		 -


1. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

  1. C110340E26
    Disconnect the park/neutral position switch connector.

  1. Measure resistance according to the value(s) in the table below when the shift lever is moved to each position.

    Standard resistance:
    Shift Position
    		 Tester Connection
    		 Specified Condition
    P
    		 2 - 6 and 4 - 5
    		 Below 1 Ω
    Except P
    		 ↑
    		 10 kΩ or higher
    R
    		 1 - 2
    		 Below 1 Ω
    Except R
    		 ↑
    		 10 kΩ or higher
    N
    		 2 - 9 and 4 - 5
    		 Below 1 Ω
    Except N
    		 ↑
    		 10 kΩ or higher
    D, S, "+" and "-"
    		 2 - 7
    		 Below 1 Ω
    Except D, S, "+" and "-"
    		 ↑
    		 10 kΩ or higher



NG
REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY
OK


2. INSPECT TRANSMISSION CONTROL SWITCH

  1. C110341E15
    Connect the park/neutral position switch connector.

  1. Disconnect the transmission control switch connector of shift lock control unit assembly.

  1. Measure resistance according to the value(s) in the table below when the shift lever is moved to each position.

    Standard resistance:
    Shift Position
    		 Tester Connection
    		 Specified Condition
    S, "+" and "-"
    		 3 - 7
    		 Below 1 Ω
    Except S, "+" and "-"
    		 ↑
    		 10 kΩ or higher



NG
REPLACE TRANSMISSION CONTROL SWITCH
OK


3. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)

  1. C106208E03
    Connect the transmission control switch connector of shift lock control unit assembly.

  1. Turn the engine switch on (IG) position, and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

    Standard voltage:
    Shift Position
    		 Tester Connection
    		 Specified Condition
    P and N
    		 E4-4 (STAR) - Body ground
    		 Below 1 V
    Except P and N
    		 ↑
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)

  1. C110349E04
    Disconnect the ECM connector.

  1. Turn the engine switch on (IG) position, and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

    Standard voltage:
    Shift Position
    		 Tester Connection
    		 Specified Condition
    P
    		 E4-6 (P) - Body ground
    		 10 to 14 V
    Except P
    		 ↑
    		 Below 1 V
    N
    		 E4-32 (N) - Body ground
    		 10 to 14 V
    Except N
    		 ↑
    		 Below 1 V
    R
    		 E4-8 (R) - Body ground
    		 10 to 14 V *
    Except R
    		 ↑
    		 Below 1 V
    D and S
    		 E4-9 (D) - Body ground
    		 10 to 14 V
    Except D and S
    		 ↑
    		 Below 1 V
    S, "+" and "-"
    		 A6-9 (S) - Body ground
    		 10 to 14 V
    Except S, "+" and "-"
    		 ↑
    		 Below 1 V

    HINT:
    *: The voltage will drop slightly due to the turning on of the back up light.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM


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