Code No.C1387:
Lateral G-sensor function decrease
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- If there is
any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnosis Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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The G and yaw rate sensor output signal is sent to TCL/ASC-ECU via the CAN bus
lines.
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DIAGNOSIS CODE SET CONDITIONS
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If the G and yaw rate sensor determines that its incorporated lateral G-sensor has a trouble,
it sends the diagnostic signal to the TCL/ASC-ECU. When TCL/ASC-ECU receives this
diagnostic signal, it determines that the sensor has a trouble and sets the diagnosis code.
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- Malfunction of the G and yaw rate sensor
- Malfunction of TCL/ASC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .)
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is the diagnosis code No.C1387 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. G and yaw rate sensor installation state check
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Check that the G and yaw rate sensor is installed correctly (not tilted).
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Q.
Is the check result normal?
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Go to Step 4.
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Reinstall the G and yaw rate sensor (Refer to ). Then
go to Step 6.
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STEP 4. M.U.T.-III data list
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Check the following data list.(Refer to .)
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- Item No. 08: Lateral G sensor
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the G and yaw rate sensor (Refer to ). Then
go to Step 6.
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STEP 5. Diagnosis code recheck
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(2)Erase the diagnosis code.
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(3)Ignition switch: "LOCK" (OFF)
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(5)Drive the vehicle at 40 km/h or more.
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Q.
Is the diagnosis code No.C1387 set?
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Replace the hydraulic unit (integrated with TCL/ASC-ECU) (Refer to ).
Then go to Step 6.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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STEP 6. Diagnosis code recheck
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(2)Erase the diagnosis code.
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(3)Ignition switch: "LOCK" (OFF)
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(5)Drive the vehicle at 40 km/h or more.
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Q.
Is the diagnosis code No.C1387 set?
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Return to Step 1.
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This diagnosis is complete.
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