- Wire harness or connector
- Front acceleration sensor RH
- Suspension control ECU
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Suspension | Section: Suspension Control System | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002PE6009X |
| Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DESCRIPTION (2008 Sequoia) | ||
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DTC |
C1715 |
Front Acceleration Sensor RH Malfunction |
|
DTC |
C1716 |
Front Acceleration Sensor LH Malfunction |
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DTC |
C1717 |
Rear Acceleration Sensor Malfunction |
|
DTC |
C1796 |
Front Acceleration Sensor RH Malfunction (Test Mode DTC) |
|
DTC |
C1797 |
Front Acceleration Sensor LH Malfunction (Test Mode DTC) |
|
DTC |
C1798 |
Rear Acceleration Sensor Malfunction (Test Mode DTC) |
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 driver side instrument panel, and 3) the passenger side instrument panel. 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's signal. If a sensor's signal does not fluctuate, test mode DTCs C1796, C1797 and C1798 are output.
|
DTC Code |
Detection Condition |
Trouble Area |
|---|---|---|
|
C1715 |
With the ignition switch ON, a voltage of 4.7 V or more, or 0.3 V or less at front acceleration sensor RH is detected for 1 second. |
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C1716 |
With the ignition switch ON, a voltage of 4.7 V or more, or 0.3 V or less at front acceleration sensor LH is detected for 1 second. |
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C1717 |
With the ignition switch ON, a voltage of 4.7 V or more, or 0.3 V or less at rear acceleration sensor is detected for 1 second. |
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C1796 |
On level surface, G sensor input is +/- 1.96 m/s2 or more for 1 second or more. |
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C1797 |
On level surface, G sensor input is +/- 1.96 m/s2 or more for 1 second or more. |
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C1798 |
On level surface, G sensor input is +/- 1.96 m/s2 or more for 1 second or more. |
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HINT:
If DTCs C1717 and C1798 (Rear Acceleration Sensor Malfunction) are output, replace the suspension control ECU (houses rear acceleration sensor).
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (G SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON, and turn the Techstream main switch on.
(c) 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 |
G (up & down) front acceleration sensor RH reading / min.: -1045.29 m/s2 max.: 1045.26 m/s2 |
0 +/- 0.98 m/s2 at still condition |
Reading changes when vehicle (FR) is bounced |
|
(Up & Down) G Sensor FL |
G (up & down) front acceleration sensor LH reading / min.: -1045.29 m/s2 max.: 1045.26 m/s2 |
0 +/- 0.98 m/s2 at still condition |
Reading changes when vehicle (FL) is bounced |
|
(Up & Down) G Sensor Rear |
G (up & down) rear acceleration sensor reading / min.: -1045.29 m/s2 max.: 1045.26 m/s2 |
0 +/- 0.98 m/s2 at still condition |
Reading changes when vehicle (rear) is bounced |
OK:
Acceleration value changes.
|
|
2. |
INSPECT ACCELERATION SENSOR (FRONT LH OR RH) |
(a) Turn the ignition switch off.
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(b) Check the acceleration sensor RH: (C1715, C1796). (1) Remove the acceleration sensor RH
(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:
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(c) Check the acceleration sensor LH: (C1716, C1797). (1) Remove the acceleration sensor LH
(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:
NOTICE:
Do not apply a voltage of more than 6 V. HINT:
When the acceleration sensor is tilted, it may output a different value.
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3. |
CHECK HARNESS AND CONNECTOR (FRONT ACCELERATION SENSOR - ECU AND BODY GROUND) |
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(a) Check the acceleration sensor RH: (C1715, C1796). (1) Disconnect the O17 and O18 ECU connector. (2) Disconnect the H74 sensor connector. (3) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(b) Check the acceleration sensor LH: (C1716, C1797). (1) Disconnect the O17 and O18 ECU connector. (2) Disconnect the H75 sensor connector. (3) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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