C1716
SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1715: Front Acceleration Sensor RH Malfunction
DTC C1715 - Front Acceleration Sensor RH Malfunction
DTC C1716 - Front Acceleration Sensor LH Malfunction
DTC C1717 - Rear Acceleration Sensor Malfunction
DTC C1791/91 - Front Acceleration Sensor RH
DTC C1792/92 - Front Acceleration Sensor LH
DTC C1793/93 - Rear Acceleration Sensor
DESCRIPTION
The acceleration sensors detect the up-and-down acceleration of the vehicle. The acceleration sensors (3 in total) are mounted in the suspension control ECU, at the LH side of the cowl and in the rear quarter area, and detect the up-and-down acceleration of the vehicle, respectively. The acceleration sensors convert the resistance into an electrical signal and output to the suspension control ECU.
HINT:
- When DTC C1791/91 is output, follow the same procedure as DTC C1715/15.
- When DTC C1793/93 is output, follow the same procedure as DTC C1717/17.
- Since the acceleration sensor front LH is built into the suspension control ECU, replace suspension control ECU when DTC C1716/16 and C1792/92 are output.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- If DTC C1761/61 (ECU malfunction) and/or C1774/74 (power source circuit) is displayed, perform the inspection necessary for DTC C1761/61 C1761 and/or C1774/74 C1774 first.
(If DTC C1761/61 and C1774/74 are output at the same time, perform the inspection necessary for DTC C1774/74 first.)
- Start the inspection from the step 1 when using the Techstream, and start from step 2 when not using the Techstream.
PROCEDURE
1. READ VALUE USING DATA LIST
(a) Connect the Techstream to DLC3.
(b) Turn the ignition switch ON and Techstream on.
(c) Select the item "G (Up & Down) Sensor FR" or "G (Up & Down) Sensor Rear" in the Data List, and read its value displayed on the Techstream.
(d) Check that the acceleration value of the acceleration sensor which is displayed in the Techstream changes while bouncing the vehicle.
Standard:
Acceleration value changes.
OK -- CHECK AND REPLACE SUSPENSION CONTROL ECU
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR POWER SOURCE)
(a) Disconnect the suspect acceleration sensor connector.
(b) Turn the ignition switch ON, and measure voltage between terminals 2 and 3 of the acceleration sensor wire harness side connector.
Standard voltage:
4.5 to 5.5 V
OK -- CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - SUSPENSION CONTROL ECU)
NG -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - SUSPENSION CONTROL ECU)
(a) Acceleration sensor assembly front RH
(1) Check for open and short circuit in the harness and the connector between terminal 2 (SHG) of the acceleration sensor front RH and S19-22 (SGR) of the suspension control ECU Electronic Circuit Inspection Procedure.
(2) Check for open and short circuit in the harness and the connector between terminal 3 (SHB) of the acceleration sensor front RH and S19-18 (SBR) of the suspension control ECU Electronic Circuit Inspection Procedure.
(b) Acceleration sensor rear
(1) Check for open and short circuit in the harness and the connector between terminal 2 (SGND) of the acceleration sensor rear and S20-25 (SGR3) of the suspension control ECU Electronic Circuit Inspection Procedure.
(2) Check for open and short circuit in the harness and the connector between terminal 3 (SGV) of the acceleration sensor rear and S19-21 (SBR3) of the suspension control ECU Electronic Circuit Inspection Procedure.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - SUSPENSION CONTROL ECU)
(a) Acceleration sensor assembly front RH
(1) Check for open and short circuit in the harness and the connector between terminal 1 (SGFL) of the acceleration sensor front RH and S20-27 (SGFR) of the suspension control ECU Electronic Circuit Inspection Procedure.
Result:
(b) Acceleration sensor rear
(1) Check for open and short circuit in the harness and the connector between terminal 1 (SGRR) of the acceleration sensor front RH and S20-28 (SGRR) of the suspension control ECU Electronic Circuit Inspection Procedure.
Result:
B -- INSPECT ACCELERATION SENSOR (REAR)
A -- INSPECT ACCELERATION SENSOR ASSEMBLY (FRONT RH)
C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
5. INSPECT ACCELERATION SENSOR ASSEMBLY (FRONT RH)
(a) Remove the acceleration sensor assembly front RH.
(b) Connect 3 dry batteries of 1.5 V in series.
(c) Connect terminal 3 (SHB) to the batteries' positive (+) terminal, and terminal 2 (SHG) to the batteries' negative (-) terminal, then measure the voltage between terminals 1 (SGFL) and 2 (SHB) in the following conditions.
Standard voltage:
NOTICE:
- Do not apply more than 6 V.
- Do not drop the acceleration sensor assembly. If it is dropped, replace it with a new one.
- Never place the acceleration sensor assembly removed from the vehicle upside down.
HINT: When the acceleration sensor assembly is tilted, it may output a different value.
NG -- REPLACE ACCELERATION SENSOR ASSEMBLY
OK -- CHECK AND REPLACE SUSPENSION CONTROL ECU
6. INSPECT ACCELERATION SENSOR (REAR)
(a) Remove the acceleration sensor rear.
(b) Connect 3 dry batteries of 1.5 V in series.
(c) Connect terminal 3 (SGV) to the batteries' positive (+) terminal, and terminal 2 (SGMD) to the batteries' negative (-) terminal, then measure the voltage between terminals 1 (SGRR) and 2 (SGMD) in the following conditions.
Standard voltage:
NOTICE:
- Do not apply more than 6 V.
- Do not drop the acceleration sensor. If it is dropped, replace it with a new one.
- Never place the acceleration sensor assembly removed from the vehicle upside down.
HINT: When the acceleration sensor is tilted, it may output the different value.
NG -- REPLACE ACCELERATION SENSOR
OK -- CHECK AND REPLACE SUSPENSION CONTROL ECU