P187C
DTC P187C: Gear Block ReverseCAUTION
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble 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.
DIAGNOSTIC FUNCTION
TC-SST-ECU checks that the gear engagement is normal.
DESCRIPTIONS OF MONITOR METHODS
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
DIAGNOSTIC PROCEDURE
Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A
STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.
1) Erase the DTC.
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.)
3) Check that the DTC is reset.
Q: Is DTC No. P187C set?
YES: Go to Step 3.
NO: Intermittent malfunction.
STEP 3. Scan tool Teach-in
1) Carry out the Item No.3: Line pressure Test. Teach-In Reference Table
2) After Teach-In, check which result ("Yes" or "No") is displayed in the Data list No. 101: Normal End. Teach-In Reference Table
Q: Which is displayed, "Yes" or "No"?
"Yes": Go to Step 4
"No" DTC No. P181B: Carry out the troubleshooting for the DTC No. P181B: Clutch 1 (Pressure low range out). P181B
STEP 4. Replace the clutch assembly, and check if the DTC is reset.
1) Replace the clutch assembly.
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.)
3) Check the DTC,
Q: Is DTC No. P187C set?
YES: Replace the transaxle assembly.
NO: This diagnosis is complete.