[Previous]

[Next]

DTC P0843: Clutch 1 Pressure Sensor System (Output 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 clutch 1 pressure sensor is normal.

DESCRIPTIONS OF MONITOR METHODS

The output of the clutch 1 pressure sensor 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)

P0841: Clutch 1 pressure sensor system (Poor performance)
P0842: Clutch 1 pressure sensor system (Output low range out)
P0753: Shift select solenoid 1 system (Open circuit)
P0973: Shift select solenoid 1 system (Short to ground)
P0974: Shift select solenoid 1 system (Short to power supply)
P2733: Clutch/shift switching solenoid 1, spool stuck
P2736: Clutch/shift switching solenoid 1 system (Open circuit)
P2738: Clutch/shift switching solenoid 1 system (Short to ground)
P2739: Clutch/shift switching solenoid 1 system (Short to power supply)
P181B: Clutch 1 (Pressure low range out)
P181C: Clutch 1 (Pressure high range out)
P181E: Clutch 2 (Pressure low range out)
P181F: Clutch 2 (Pressure high range out)
P185D: Clutch open not possible

Sensor (The sensor below is determined to be normal)

Shift select solenoid 1
Clutch/shift switching solenoid 1

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.
Engine speed: 650 r/min or more.
Time since above engine condition: 1.5 second or more.

JUDGMENT CRITERIA

Sensor voltage: 2.48 V or more. (160 millisecond)

OBD-II DRIVE CYCLE PATTERN

The voltage of the clutch 1 pressure sensor remains 2.48 V or less for 160 milliseconds.

PROBABLE CAUSES

Malfunction of TC-SST-ECU
Malfunction of clutch 1 pressure sensor

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.

15 seconds after turning ON the ignition switch, check that the diagnostic trouble code is reset.

Q. Is DTC No. P0843 set?

	Replace the transaxle assembly. (Refer to .)

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