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 |
 | |
(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 | | 
