Code No.P187C: Reverse Gear Block
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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.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
TC-SST-ECU checks that the gear engagement is normal.
DIAGNOSIS CODE SET CONDITIONS
The engagement of the reverse gear is determined to be impossible.
PROBABLE CAUSES
- Malfunction of TC-SST-ECU
- Malfunction of TC-SST gear
- Malfunction of clutch assembly
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III to perform the CAN bus diagnosis.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting  .) After repairing the CAN bus line, go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)With the engine idle status, operate the shift lever in the following sequence: P → R → D → R → P. (Hold each range for 5 seconds or more.)
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(3)Check that the diagnosis code is reset.
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Q.
Is diagnosis code No.P187C set?
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Go to Step 3.
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Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)
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STEP 3. M.U.T.-III Teach-In
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(1)Carry out the Item No.3: Line pressure Test. (Refer to Special Function (Teach-In Reference Table ).)
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(2)After Teach-In, check which result ("Yes" or "No") is displayed in the Data list No. 101: Normal End. (Refer to Special Function (Teach-In Reference Table ).)
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Q.
Which is displayed, "Yes" or "No"?
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"Yes" : Go to Step 4
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"No" : Diagnosis code No. P181B: Carry out the troubleshooting for the diagnosis code No. P181B: Clutch 1 (Pressure low range out). (Refer to .)
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STEP 4. Replace the clutch assembly, and check if the diagnosis code is reset.
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(1)Replace the clutch assembly. (Refer to GROUP 22E -Transmission .)
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(2)With the engine idle status, operate the shift lever in the following sequence: P → R → D → R → P. (Hold each range for 5 seconds or more.)
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(3)Check the diagnosis code.
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Q.
Is diagnosis code No.P187C set?
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Replace the transmission assembly. (Refer to .)
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This diagnosis is complete.
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