P1821
DTC P1821: Shift Fork Position Sensor 1 System (Voltage high range 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 voltage of the shift fork position sensor 1 is normal.
DESCRIPTIONS OF MONITOR METHODS
The voltage of the shift fork position sensor 1 is too high.
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)
^ P1822: Shift fork position sensor 1 system (Output range out)
^ P1823: Shift fork position sensor 1 system (Neutral)
^ P1824: Shift fork position sensor 1 system (Poor performance)
^ 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)
DTC SET CONDITIONS
Check Conditions
^ Voltage of battery: 8 V or more.
^ Voltage of battery: 16.5 V or less.
JUDGMENT CRITERIA
Position sensor voltage: 3.008 V or more. (160 millisecond)
OBD-II DRIVE CYCLE PATTERN
The position sensor voltage remains 3.008 V or less for 160 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. P1821 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.