P187C

DTC P187C: Gear Block Reverse

CAUTION
^ 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. (Refer to Troubleshooting.) CAN Bus Diagnostics Chart After repairing the CAN bus line, go to Step 2.

STEP 2. Check the fluid.

Q:Is the fluid level proper?
YES : Go to Step 3.
NO : Add the fluid.

STEP 3. 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 : Replace the transaxle assembly.
NO : Intermittent malfunction. (Refer to How to Cope with Intermittent Malfunction.) Troubleshooting Contents