Dtc C1715/15 Front Acceleration Sensor Rh Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (G SENSOR)

INSPECT ACCELERATION SENSOR (FRONT RH OR REAR)

CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - SUSPENSION CONTROL ECU)

DTC C1715/15 Front Acceleration Sensor RH Malfunction

DTC C1716/16 Front Acceleration Sensor LH Malfunction

DTC C1717/17 Rear Acceleration Sensor Malfunction

DTC C1796/96 (Up & Down) G Sensor FR

DTC C1797/97 (Up & Down) G Sensor FL

DTC C1798/98 (Up & Down) G Sensor Rear


DESCRIPTION

The acceleration sensor (up and down G sensor) detects the upward and downward acceleration of the vehicle, and outputs it as a voltage to the suspension control ECU. Up and down G sensors are installed in 3 locations: 1) the suspension control ECU, 2) the RH side instrument panel, and 3) behind the deck trim side panel assembly LH. Each up and down G sensor independently detects the upward and downward acceleration. During a test mode inspection, the suspension control ECU reads the fluctuations in each sensor signal. If a sensor signal does not fluctuate, test mode DTCs C1796/96, C1797/97 and C1798/98 are stored.

DTC Code
DTC Detection Condition
Trouble Area
C1715/15
Either condition is met:
  1. With the ignition switch ON, a voltage of 5.5 V or higher or 4.3 V or less at the power source of the front acceleration sensor RH is detected for 0.5 seconds.
  2. With the ignition switch ON, a voltage of 4.7 V or higher or 0.3 V or less at the front acceleration sensor RH is detected for 1 second.
  1. Harness or connector
  2. Front acceleration sensor RH
  3. Suspension control ECU
C1716/16
Either condition is met:
  1. With the ignition switch ON, a voltage of 5.5 V or higher or 4.3 V or less at the power source of the front acceleration sensor LH is detected for 0.5 seconds.
  2. With the ignition switch ON, a voltage of 4.7 V or higher or 0.3 V or less at the front acceleration sensor LH is detected for 1 second.
Suspension control ECU (Front acceleration sensor LH)
C1717/17
Either condition is met:
  1. With the ignition switch ON, a voltage of 5.5 V or higher or 4.3 V or less at the power source of the rear acceleration sensor is detected for 0.5 seconds.
  2. With the ignition switch ON, a voltage of 4.7 V or higher or 0.3 V or less at the rear acceleration sensor is detected for 1 second.
  1. Harness or connector
  2. Rear acceleration sensor
  3. Suspension control ECU
C1796/96
On a level surface, the G sensor input is +/- 1.96 m/s2 or more for 1 second or more.
  1. Harness or connector
  2. Front acceleration sensor RH
  3. Suspension control ECU
C1797/97
On a level surface, the G sensor input is +/- 1.96 m/s2 or more for 1 second or more.
Suspension control ECU (Front acceleration sensor LH)
C1798/98
On a level surface, the G sensor input is +/- 1.96 m/s2 or more for 1 second or more.
  1. Harness or connector
  2. Rear acceleration sensor
  3. Suspension control ECU
HINT:
If DTCs C1716/16 and C1797/97 are output, replace the suspension control ECU (houses the front acceleration sensor LH).

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1715/15 Front Acceleration Sensor Rh Malfunction


INSPECTION PROCEDURE

NOTICE:
When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).
1.READ VALUE USING INTELLIGENT TESTER (G SENSOR)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / Air suspension / Data List.

    Air Suspension
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    (Up & Down) G Sensor FR
    		(Up & Down) G sensor (Front RH)/
    Min.: -1045.29 m/s2
    Max.: 1045.26 m/s2
    		0 +/- 0.98 m/s2 when stationary
    		The value changes when the vehicle (Front RH) is bounced.
    (Up & Down) G Sensor FL
    		(Up & Down) G sensor (Front LH)/
    Min.: -1045.29 m/s2
    Max.: 1045.26 m/s2
    		0 +/- 0.98 m/s2 when stationary
    		The value changes when the vehicle (Front LH) is bounced.
    (Up & Down) G Sensor Rear
    		(Up & Down) G sensor (Rear)/
    Min.: -1045.29 m/s2
    Max.: 1045.26 m/s2
    		0 +/- 0.98 m/s2 when stationary
    		The value changes when the vehicle (rear) is bounced.
    OK:
    Acceleration value changes.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

2.INSPECT ACCELERATION SENSOR (FRONT RH OR REAR)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1715/15 Front Acceleration Sensor Rh Malfunction
Text in Illustration
*A
for Front RH
*B
for Rear
*a
Component without harness connected
(Acceleration Sensor)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Upside
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155
Downside

  1. Check the front acceleration sensor RH (when DTC C1715/15 or C1796/96 is output).

    1. Remove the front acceleration sensor RH (LandCruiser RM000002BGR01VX.html).

    2. Connect 3 dry cell batteries of 1.5 V in series.

    3. Connect the positive (+) end of the batteries to terminal 3 (SHB) of the acceleration sensor and the negative (-) end of the batteries to terminal 2 (SHG). Then measure the voltage between terminal 1 (SGFL) and terminal 2 (SHG).

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

      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      1 (SGFL) - 2 (SHG)
      		Sensor in vertical position
      		Approx. 2.0 to 2.5 V
      Sensor tilted left or right from vertical position
      		Changes between approx. 0.9 and 2.3 V

  1. Check the rear acceleration sensor: (when DTC C1717/17 or C1798/98 is output).

    1. Remove the rear acceleration sensor (LandCruiser RM000002BGR01WX.html).

    2. Connect 3 dry cell batteries of 1.5 V in series.

    3. Connect the positive (+) end of the batteries to terminal 3 (SGV) of the acceleration sensor and the negative (-) end of the batteries to terminal 2 (SGND). Then measure the voltage between terminal 1 (SGRR) and terminal 2 (SGND).

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

      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      1 (SGRR) - 2 (SGND)
      		Sensor in vertical position
      		Approx. 2.0 to 2.5 V
      Sensor tilted left or right from vertical position
      		Changes between approx. 0.9 and 2.3 V
      NOTICE:
      Do not apply a voltage of higher than 6 V.
      HINT:
      When the acceleration sensor is tilted, it may output a different value.
      Result
      Result
      		Proceed to
      OK
      		A
      NG (Front acceleration sensor RH)
      		B
      NG (Rear acceleration sensor)
      		C


B
REPLACE FRONT ACCELERATION SENSOR RH (LandCruiser RM000002BGR01VX.html)

C
REPLACE REAR ACCELERATION SENSOR (LandCruiser RM000002BGR01WX.html)
A


3.CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - SUSPENSION CONTROL ECU)

  1. Check the front acceleration sensor RH (when DTC C1715/15 or C1796/96 is output).

    1. Disconnect the A13 front acceleration sensor RH connector.

    2. Disconnect the A14 suspension control ECU connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      A13-1 (SGFL) - A14-18 (SGFR)
      		Always
      		Below 1 Ω
      A13-2 (SHG) - A14-10 (SGR)
      		Always
      		Below 1 Ω
      A13-3 (SHB) - A14-9 (SBR)
      		Always
      		Below 1 Ω
      A13-1 (SGFL) - Body ground
      		Always
      		10 kΩ or higher
      A13-2 (SHG) - Body ground
      		Always
      		10 kΩ or higher
      A13-3 (SHB) - Body ground
      		Always
      		10 kΩ or higher

  1. Check the rear acceleration sensor: (when DTC C1717/17 or C1798/98 is output).

    1. Disconnect the R18 rear acceleration sensor connector.

    2. Disconnect the A49 suspension control ECU connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      R18-1 (SGRR) - A49-26 (SGRR)
      		Always
      		Below 1 Ω
      R18-2 (SGND) - A49-16 (SGR3)
      		Always
      		Below 1 Ω
      R18-3 (SGV) - A49-17 (SBR3)
      		Always
      		Below 1 Ω
      R18-1 (SGRR) - Body ground
      		Always
      		10 kΩ or higher
      R18-2 (SGND) - Body ground
      		Always
      		10 kΩ or higher
      R18-3 (SGV) - Body ground
      		Always
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SUSPENSION CONTROL ECU (LandCruiser RM000002BGR01UX.html)