Code No. U1102 ASTC-ECU time-out
caution |
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DIAGNOSIS CODE SET CONDITIONS
Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the ASTC-ECU and the engine-A/T-ECU, the power supply system to the ASTC-ECU, the ASTC-ECU itself, or the engine-A/T-ECU may be defective.
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness in the CAN bus lines between the ASTC-ECU and the engine-A/T-ECU, and the power supply system to the ASTC-ECU. For diagnosis procedures, refer to "How to cope with past trouble" (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points ).
PROBABLE CAUSES
- Damaged wiring harness or connector
- Malfunction of the ASTC-ECU
- Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE |
STEP 1. M.U.T.-III CAN bus diagnostics |
Using M.U.T.-III, perform CAN bus line diagnosis. |
Q.
Is the check result normal?
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Go to Step 2. |
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Repair the CAN bus line (Refer to GROUP 54D - Troubleshooting ). and then go to Step 4. |
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STEP 2. M.U.T.-III other system diagnosis codes |
Check whether the ASTC system diagnosis codes are set or not. |
Q.
Is the diagnosis code set?
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YES : Diagnose the ASTC system (Refer to GROUP 35C - Troubleshooting, Inspection Chart For Diagnosis Codes ). |
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Go to Step 3. |
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STEP 3. M.U.T.-III diagnosis code |
Reconfirm whether the diagnosis codes are set from engine-A/T-ECU. |
(1)Erase the diagnosis code. |
(2)Check if the diagnosis code is set. |
Q.
Is the diagnosis code set?
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Go to Step 4. |
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Intermittent malfunction in CAN bus line between ASTC-ECU and engine-A/T-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ). |
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STEP 4. Replace the ASTC-ECU |
After replacing the ASTC-ECU, re-check the A/T diagnosis code output. |
Q.
Is the diagnosis code set?
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Replace the engine-A/T-ECU. |
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The check is end. |
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