[Previous]

[Next]

DTC P1835: Shift Fork Position Sensor 4 System (Poor performance)

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 shift fork position sensor 4 is normal.

DESCRIPTIONS OF MONITOR METHODS

The shift fork position sensor 4 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)

P1831: Shift fork position sensor 4 system (Voltage low range out)
P1832: Shift fork position sensor 4 system (Voltage high range out)
P1833: Shift fork position sensor 4 system (Output range out)
P1834: Shift fork position sensor 4 system (Neutral)
P184B: Shift fork 4 malfunction
P1852: Shift fork 1 or 2 opposite direction movement
P1855: Shift fork 3 or 4 opposite direction movement
P1858: Even number gear axle interlock
P1876: Gear block 1st
P1877: Gear block 2nd
P1878: Gear block 3rd
P1879: Gear block 4th
P187A: Gear block 5th
P187B: Gear block 6th
P187C: Gear block reverse
P1888: Shift fork 4 jump out

Sensor (The sensor below is determined to be normal)

Not applicable

LOGIC FLOW CHARTS (Monitor Sequence) <Shift fork 4 current gear: 4th gear>

DTC SET CONDITIONS <SHIFT FORK 4 CURRENT GEAR: 4TH 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.
Input shaft 2 (even) speed: 500 r/min or more.
Shift fork 4 current gear: 4th gear.
Synchro (2nd gear) slip speed: 80 r/min or more.
Requested shift fork: Not shift fork 4.

JUDGMENT CRITERIA

Shift fork 4 position: 6 mm (0.24 inch) or less. (250 millisecond)

OBD-II DRIVE CYCLE PATTERN <SHIFT FORK 2 CURRENT GEAR: 4TH GEAR>

The travel distance of the shift fork 4 remains 6 mm (0.24 inch) or more for 250 milliseconds.

LOGIC FLOW CHARTS (Monitor Sequence) <Shift fork 4 current gear: 2nd gear>

DTC SET CONDITIONS <SHIFT FORK 4 CURRENT GEAR: 2ND GEAR>

Check Conditions

Voltage of battery: 8 volts or more.
Voltage of battery: 16.5 volts or less.
Engine speed: 650 r/min or more.
Time since above engine condition: 1.5 second or more.
Input shaft 2 (even) speed: 500 r/min or more.
Shift fork 4 current gear: 2nd gear.
Synchro (4th gear) slip speed: 80 r/min or more.
Requested shift fork: not shift fork 4.

JUDGMENT CRITERIA

Shift fork 4 position: -6 mm (-0.24 in) or more. (250 millisecond)

OBD-II DRIVE CYCLE PATTERN <SHIFT FORK 2 CURRENT GEAR: 3RD GEAR>

The travel distance of the shift fork 4 remains -6 mm (-0.24 inch) or less for 250 milliseconds.

PROBABLE CAUSES

Malfunction of TC-SST-ECU
Malfunction of shift fork position sensor 4

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.

After driving in the 4th gear, check that the DTC is reset.

Q. Is DTC No. P1835 set?

	Replace the transaxle assembly. (Refer to .)

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