DTC P1887: SHIFT FORK 3 JUMP OUT

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 movement of the shift fork 3 is normal.

DESCRIPTIONS OF MONITOR METHODS

The movement of the shift fork 3 is determined to be abnormal.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

Not applicable

Sensor (The sensor below is determined to be normal)

Not applicable

LOGIC FLOW CHARTS (Monitor Sequence) <Functional check - 6th gear>

DTC SET CONDITIONS <FUNCTIONAL CHECK - 6TH GEAR>

Check Conditions

Voltage of battery: 8 V or more.
Voltage of battery: 16.5 V or less.
Engine speed: 650 r/min or more.
Time since above engine condition: 1.5 second or more.
Shift fork 3 current gear: 6th gear.

JUDGMENT CRITERIA

Shift fork position: -6 mm (-0.24 inch) or more, and input shaft 2 (even) speed: 500 r/min or more, or synchro (6th gear) slip speed: 80 r/min or more. (400 millisecond)

OBD-II DRIVE CYCLE PATTERN <FUNCTIONAL CHECK - 6TH GEAR>

The status with the shift fork position -6 mm (-0.24 inch) or less, or with the input shaft 2 (even) speed 500 r/min or less and with the synchro (6th gear) slip speed 80 r/min or less continues for 400 milliseconds.

PROBABLE CAUSES

Malfunction of TC-SST-ECU
Malfunction of TC-SST shift fork
Malfunction of valve body

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?

	Go to Step 2.

	Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .) After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

(1)Erase the DTC.

(2)Drive with shifted in the 6th gear.

(3)Check that the DTC is reset.

Q. Is DTC No.P1887 set?

	Replace the transaxle assembly. (Refer to .)

	Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)