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DTC P2720: Clutch/Shift Pressure Solenoid 1 System (Short to ground)

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/shift pressure solenoid 1 circuit is normal.

DESCRIPTIONS OF MONITOR METHODS

The clutch/shift pressure solenoid 1 circuit is determined to be short to ground.

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)
P0843: Clutch 1 pressure sensor system (Output high range out)
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)

Sensor (The sensor below is determined to be normal)

Clutch 1 pressure sensor
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.

JUDGMENT CRITERIA

FET (Field Effect Transistor) output: 100 mV or less. (400 millisecond)

OBD-II DRIVE CYCLE PATTERN

The FET channel output remains 100 mV or more for 400 milliseconds.

PROBABLE CAUSES

Malfunction of TC-SST-ECU
Malfunction of clutch/shift pressure solenoid 1

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.

Q. Is DTC No. P2720 set?

	Replace the transaxle assembly. (Refer to .)

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