Code No. C1608:
EEPROM fail
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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 Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the G and yaw rate sensor and the steering wheel sensor (Refer to and ).
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OPERATION
The ASC-ECU stores the vehicle information such as a sensor learnt value in the integrated
EEPROM*.
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*: EEPROM (Electrically Erasable and Programmable Read Only Memory)
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DIAGNOSIS CODE SET CONDITIONS
This code is set under the cases below:
- The vehicle information such as a sensor learnt value is unfeasible.
PROBABLE CAUSES
- Removal of ASC-ECU connector or battery terminal with the ignition switch
"ON".
- Battery failure.
- Battery terminal looseness.
- Defective battery charger.
- Damaged harness wires and connectors.
- Malfunction of the hydraulic unit assembly (integrated with ASC-ECU).
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STEP 1. M.U.T.-III CAN bus diagnosis.
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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 line (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 diagnosis code No. C1608 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check the battery.
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Refer to GROUP 54A -
Battery Test.
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Q.
Is the battery in good condition?
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Go to Step 4.
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Charge or replace the battery. Then go to Step 10.
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STEP 4. Check the charging system.
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Refer to GROUP 16 -
Charging System, On-vehicle Service.
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Q.
Is the charging system in good condition?
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Go to Step 5.
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Repair or replace the charging system component(s). Then go to Step 10.
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STEP 5. Measure the resistance at the ASC-ECU connector.
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(1)Connector check: the hydraulic unit assembly (integrated with ASC-ECU) connector,
the fuses (relay box) and the fusible links.
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(2)Disconnect the hydraulic unit assembly (integrated with ASC-ECU) connector.
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(3)Measure the resistance between +BV terminal and body earth.
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 6.
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The power supply circuit may be short. Repair the wiring harness wires or connectors
between the hydraulic unit assembly (integrated with ASC-ECU) connector +BV terminal
and the fusible links, the fuse (relay box) or the fusible links. Then go to Step 10.
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STEP 6. Measure the resistance at the ASC-ECU connector.
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(1)Connector check: the hydraulic unit assembly (integrated with ASC-ECU) connector
and the fusible links.
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(2)Disconnect the hydraulic unit assembly (integrated with ASC-ECU) connector and
remove the fusible links.
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(3)Measure the resistance between +BM terminal and body earth.
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 7.
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The power supply circuit may be short. Repair the wiring harness wires or connectors
between the hydraulic unit assembly (integrated with ASC-ECU) connector +BM terminal
and the fusible links, or the fusible links. Then go to Step 10.
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STEP 7. Measure the voltage at the ASC-ECU connector.
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(1)Disconnect the hydraulic unit assembly (integrated with ASC-ECU) connector.
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(2)Measure the voltage between +BV terminal and body earth.
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 8.
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The power supply circuit may be open. Repair the wiring harness wires or connectors
between the hydraulic unit assembly (integrated with ASC-ECU) connector +BV terminal
and the fusible links, the fuse (relay box) or the fusible links. Then go to Step 10.
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STEP 8. Measure the voltage at the ASC-ECU connector.
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(1)Disconnect the hydraulic unit assembly (integrated with ASC-ECU) connector.
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(2)Measure the voltage between +BM terminal and body earth.
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 9.
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The power supply circuit may be open. Repair the wiring harness wires or connectors
between the hydraulic unit assembly (integrated with ASC-ECU) connector +BM terminal
and the fusible links, or the fusible links. Then go to Step 10.
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STEP 9. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF).
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(3)Ignition switch: "ON".
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Q.
Is diagnosis code No. C1608 set?
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Replace the hydraulic unit assembly (integrated with ASC-ECU) (Refer to ). Then
go to Step 10.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to Cope with Intermittent Malfunction).
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STEP 10. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF).
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(3)Ignition switch: "ON".
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Q.
Is diagnosis code No. C1608 set?
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Return to Step 3.
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This diagnosis is complete.
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