Toyota Avalon Service & Repair Manual: Front Acceleration Sensor RH Malfunction (C1715-C1717,C1796-C1798)

Toyota Avalon Service & Repair Manual / Suspension / Suspension Control / Adaptive Variable Suspension System / Front Acceleration Sensor RH Malfunction (C1715-C1717,C1796-C1798)

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 absorber control ECU.

The 3 up and down G sensors are installed in the driver side instrument panel, the passenger side instrument panel and the absorber control ECU.

Each up and down G sensor independently detects the upward and downward acceleration of the vehicle.

During a test mode inspection, the absorber control ECU reads the fluctuations in each sensor signal.

When a sensor signal does not fluctuate, test mode DTCs C1796, C1797 and C1798 remain stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

C1715

Front Acceleration Sensor RH Malfunction

One of the following conditions is met:

  • With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less is detected at the power source of the acceleration sensor assembly RH for 0.5 seconds.
  • With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less is detected at the acceleration sensor assembly RH for 1 second.
  • Sensor output value is +/- 0.0639 m/s2 continuously for 300 seconds.
  • Acceleration sensor assembly RH
  • Wire harness or connector
  • Absorber control ECU

Does not come on

Yes

C1716

Front Acceleration Sensor LH Malfunction

One of the following conditions is met:

  • With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less is detected at the power source of the acceleration sensor assembly LH for 0.5 seconds.
  • With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less is detected at the acceleration sensor assembly LH for 1 second.
  • Sensor output value is +/- 0.0639 m/s2 continuously for 300 seconds.
  • Acceleration sensor assembly LH
  • Wire harness or connector
  • Absorber control ECU

Does not come on

Yes

C1717

Rear Acceleration Sensor Malfunction

One of the following conditions is met:

  • With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less is detected at the power source of the rear acceleration sensor (absorber control ECU) for 0.5 seconds.
  • With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less is detected at the rear acceleration sensor (absorber control ECU) for 1 second.
  • Sensor output value is +/- 0.0639 m/s2 continuously for 300 seconds.

Absorber control ECU

Does not come on

Yes

C1796

(Up&Down)G Sensor FR

With the vehicle stationary on a level surface, an acceleration sensor value that is within -1.96 to 1.96 m/s2 is not received from the acceleration sensor assembly RH for 1 second or more.

  • Acceleration sensor assembly RH
  • Wire harness or connector
  • Absorber control ECU

Test mode

(Test mode)

C1797

(Up&Down)G Sensor FL

With the vehicle stationary on a level surface, an acceleration sensor value that is within -1.96 to 1.96 m/s2 is not received from the acceleration sensor assembly LH for 1 second or more.

  • Acceleration sensor assembly LH
  • Wire harness or connector
  • Absorber control ECU

Test mode

(Test mode)

C1798

(Up&Down)G Sensor Rear

With the vehicle stationary on a level surface, an acceleration sensor value that is within -1.96 to 1.96 m/s2 is not received from the rear acceleration sensor (absorber control ECU) for 1 second or more.

Absorber control ECU

Test mode

(Test mode)

DTC Detection Conditions: C1715
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Diagnosis Condition

Engine switch is on (IG)

Malfunction Status

Sensor power source voltage is 4.3 V or less

-

-

-

-

Sensor power source voltage is 5.5 V or higher

-

-

-

-

Output voltage is 0.3 V or less

-

-

-

-

Output voltage is 4.7 V or higher

-

-

-

-

Sensor output value is +/- 0.0639 m/s2

-

-

-

-

Detection Time

0.5 seconds or more

0.5 seconds or more

1 second or more

1 second or more

300 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

1 trip

HINT:

DTC will be stored when the conditions of any pattern in the table above are met.

DTC Detection Conditions: C1716
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Diagnosis Condition

Engine switch is on (IG)

Malfunction Status

Sensor power source voltage is 4.3 V or less

-

-

-

-

Sensor power source voltage is 5.5 V or higher

-

-

-

-

Output voltage is 0.3 V or less

-

-

-

-

Output voltage is 4.7 V or higher

-

-

-

-

Sensor output value is +/- 0.0639 m/s2

-

-

-

-

Detection Time

0.5 seconds or more

0.5 seconds or more

1 second or more

1 second or more

300 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

1 trip

HINT:

DTC will be stored when the conditions of any pattern in the table above are met.

DTC Detection Conditions: C1717
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Diagnosis Condition

Engine switch is on (IG)

Malfunction Status

Sensor power source voltage is 4.3 V or less

-

-

-

-

Sensor power source voltage is 5.5 V or higher

-

-

-

-

Output voltage is 0.3 V or less

-

-

-

-

Output voltage is 4.7 V or higher

-

-

-

-

Sensor output value is +/- 0.0639 m/s2

-

-

-

-

Detection Time

0.5 seconds or more

0.5 seconds or more

1 second or more

1 second or more

300 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

1 trip

HINT:

DTC will be stored when the conditions of any pattern in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before performing troubleshooting, inspect the connectors of related circuits.
  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.

    Click here

  • Before replacing the absorber control ECU, perform all of the following:
    • Symptom simulation.

      Click here

    • DTC inspection.

      Click here

    • Techstream inspection.

      Click here

      • If no malfunctions are found in other areas, replace the absorber control ECU.
  • After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM ((UP & DOWN) G SENSOR)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Air suspension / Data List.

Chassis > Air suspension > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

(Up&Down)G Sensor FR

Front acceleration sensor RH (up and down)

Min.: -1045.29 m/s2

Max.: 1045.26 m/s2

-0.98 to 0.98 m/s2

when stationary

The value changes when the vehicle (front RH) is bounced.

(Up&Down)G Sensor FL

Front acceleration sensor LH (up and down)

Min.: -1045.29 m/s2

Max.: 1045.26 m/s2

-0.98 to 0.98 m/s2

when stationary

The value changes when the vehicle (front LH) is bounced.

(Up&Down)G Sensor Rear

Rear acceleration sensor (up and down)

Min.: -1045.29 m/s2

Max.: 1045.26 m/s2

-0.98 to 0.98 m/s2

when stationary

The value changes when the vehicle (rear) is bounced.

Chassis > Air suspension > Data List

Tester Display

(Up&Down)G Sensor FR

(Up&Down)G Sensor FL

(Up&Down)G Sensor Rear

OK:

The values are as specified in the normal condition column.

Result

Proceed to

OK

A

NG (front RH or front LH)

B

NG (rear)

C

B

GO TO STEP 3

C

REPLACE ABSORBER CONTROL ECU

A

2.

CHECK FOR DTCS

(a) Clear the DTCs.

Click here

Chassis > Air suspension > Clear DTCs

(b) Turn the engine switch off.

(c) Check for DTCs.

Click here

Chassis > Air suspension > Trouble Codes

Result

Proceed to

DTCs are output (front RH or front LH)

A

DTCs are output (rear)

B

DTCs are not output

C

B

REPLACE ABSORBER CONTROL ECU

C

USE SIMULATION METHOD TO CHECK

A

3.

INSPECT ACCELERATION SENSOR ASSEMBLY

(a) Turn the engine switch off.

(b) Remove the acceleration sensor assembly RH or acceleration sensor assembly LH.

Click here

(c) Inspect the acceleration sensor assembly RH or acceleration sensor assembly LH.

Click here

Result

Proceed to

OK

A

NG (Acceleration sensor assembly RH malfunction)

B

NG (Acceleration sensor assembly LH malfunction)

C

B

REPLACE ACCELERATION SENSOR ASSEMBLY RH

C

REPLACE ACCELERATION SENSOR ASSEMBLY LH

A

4.

CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR ASSEMBLY - ABSORBER CONTROL ECU)

(a) Check the acceleration sensor assembly RH harness and connector (when DTC C1715 is output).

(1) Disconnect the K59 absorber control ECU connector.

(2) Disconnect the K61 acceleration sensor assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K61-1 (SGFR) - K59-23 (SGS1)

Always

Below 1 Ω

K61-2 (SGG) - K59-22 (SGG1)

Always

Below 1 Ω

K61-3 (SGB) - K59-14 (SGB1)

Always

Below 1 Ω

K61-1 (SGFR) or K59-23 (SGS1) - Body ground

Always

10 kΩ or higher

K61-2 (SGG) or K59-22 (SGG1) - Body ground

Always

10 kΩ or higher

K61-3 (SGB) or K59-14 (SGB1) - Body ground

Always

10 kΩ or higher

(b) Check the acceleration sensor assembly LH harness and connector (when DTC C1716 is output).

(1) Disconnect the K59 absorber control ECU connector.

(2) Disconnect the A46 acceleration sensor assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A46-1 (SGFL) - K59-25 (SGS2)

Always

Below 1 Ω

A46-2 (SGG) - K59-24 (SGG2)

Always

Below 1 Ω

A46-3 (SGB) - K59-15 (SGB2)

Always

Below 1 Ω

A46-1 (SGFL) or K59-25 (SGS2) - Body ground

Always

10 kΩ or higher

A46-2 (SGG) or K59-24 (SGG2) - Body ground

Always

10 kΩ or higher

A46-3 (SGB) or K59-15 (SGB2) - Body ground

Always

10 kΩ or higher

OK

REPLACE ABSORBER CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Adaptive Variable Suspension System

    FR Damping Force Control Actuator Circuit (C1731-C1734)

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