P1824

DTC P1824: Shift Fork Position Sensor 1 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 1 is normal.

DESCRIPTIONS OF MONITOR METHODS
The shift fork position sensor 1 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)
^ P1820: Shift fork position sensor 1 system (Voltage low range out)
^ P1821: Shift fork position sensor 1 system (Voltage high range out)
^ P1822: Shift fork position sensor 1 system (Output range out)
^ P1823: Shift fork position sensor 1 system (Neutral)
^ P1836: Shift fork 1 malfunction
^ P1852: Shift fork 1 or 2 opposite direction movement
^ P1855: Shift fork 3 or 4 opposite direction movement
^ P1857: Odd 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

Sensor (The sensor below is determined to be normal)
Not applicable

LOGIC FLOW CHARTS (Monitor Sequence) [Shift fork 1 current gear: 1st gear]





DTC SET CONDITIONS [SHIFT FORK 1 CURRENT GEAR: 1ST GEAR]

Check Conditions
^ Voltage of battery: 8 V or more.
^ Voltage of battery: 16.5 V or less.
^ Engine speed: 500 r/min or more.
^ Time since above engine condition: 400 millisecond or more.
^ Input shaft 1 (odd) speed: 500 r/min or more.
^ Shift fork 1 current gear: 1st gear.
^ Synchro (1st gear) slip speed: 80 r/min or more.
^ Requested shift fork: Not shift fork 1.

JUDGMENT CRITERIA
^ Shift fork 1 position: 6 mm (0.24 inch) or less. (250 millisecond)

OBD-II DRIVE CYCLE PATTERN [SHIFT FORK 1 CURRENT GEAR: 1ST GEAR]
The travel distance of the shift fork 1 remains 6 mm (0.24 inch) or more for 250 milliseconds.

LOGIC FLOW CHARTS (Monitor Sequence) [Shift fork 1 current gear: Reverse gear]





DTC SET CONDITIONS [SHIFT FORK 1 CURRENT GEAR: REVERSE GEAR]

Check Conditions
^ Voltage of battery: 8 V or more.
^ Voltage of battery: 16.5 V or less.
^ Engine speed: 500 r/min or more.
^ Time since above engine condition: 400 millisecond or more.
^ Input shaft 1 (odd) speed: 500 r/min or more.
^ Shift fork 1 current gear: Reverse gear.
^ Synchro (reverse gear) slip speed: 80 r/min or more.
^ Requested shift fork: Not shift fork 1.

JUDGMENT CRITERIA
^ Shift fork 1 position: -6 mm (-0.24 inch) or more. (250 millisecond)

OBD-II DRIVE CYCLE PATTERN [SHIFT FORK 1 CURRENT GEAR: REVERSE GEAR]
The travel distance of the shift fork 1 remains-6 mm (-0.24 inch) or less for 250 milliseconds.

PROBABLE CAUSES
^ Malfunction of TC-SST-ECU

DIAGNOSTIC PROCEDURE

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.

Q: Is DTC No. P1824 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.