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DTC P0846: Clutch
2 Pressure Sensor System (Poor performance)
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- 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.
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DIAGNOSTIC FUNCTION
TC-SST-ECU checks that the clutch 2 pressure sensor is normal.
DESCRIPTIONS OF MONITOR METHODS
The difference between the allowable torque of clutch 2 and the engine torque is large.
MONITOR EXECUTION
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory
for the item monitored below)
- P0847: Clutch 2 pressure sensor system (Output low range out)
- P0848: Clutch 2 pressure sensor system (Output high 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)
- P2809: Clutch/shift switching solenoid 2, spool stuck
- P2812: Clutch/shift switching solenoid 2 system (Open circuit)
- P2814: Clutch/shift switching solenoid 2 system (Short to ground)
- P2815: Clutch/shift switching solenoid 2 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 2
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.
- Engine speed: 6,800 r/min or less.
- Clutch 2 (even) slip state: Slip or engaged.
- Clutch 2 (even) slip speed: 20 r/min or more.
- Clutch 1 (odd) state: Disengaged.
JUDGMENT CRITERIA
- Calculated torque (Clutch 2 (even) permit torque - engine torque): 200
N·m (148 ft-lb) or more. (4 seconds)
OBD-II DRIVE CYCLE PATTERN
The value of the calculated torque (clutch 2 (even) permit torque - engine torque)
remains 200 N·m (148 ft-lb) or less for 4 seconds.
PROBABLE CAUSES
- Malfunction of TC-SST-ECU
- Malfunction of clutch 2 pressure sensor
- Malfunction of clutch assembly
- Malfunction of engine system
- Insufficient fluid
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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
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STEP 1. Scan tool CAN bus diagnostics
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Using scan tool MB991958, diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting  .)
After repairing the CAN bus line, go to Step 2.
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STEP 2. Scan tool diagnostic trouble code
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Check the engine diagnostic trouble code. (Refer to GROUP 13B - Troubleshooting .)
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Perform the relevant troubleshooting.
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Go to Step 3.
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Drain the fluid and check that no bubbles, foreign material and contamination are found.
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Q.
Is the check result normal?
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Go to Step 4.
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Replace the fluid.
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STEP 4. Check whether the DTC is reset.
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(2)Gradually accelerate the vehicle.
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(3)Accelerate the vehicle with the accelerator pedal fully opened.
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(4)Check that the DTC is reset.
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Replace the transaxle assembly. (Refer to .)
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Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction .)
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