P0961

DTC P0961: Line Pressure Solenoid System (Overcurrent)

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 line pressure solenoid circuit is normal.

DESCRIPTIONS OF MONITOR METHODS
The supply current to the line pressure solenoid is determined to be overcurrent.

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)
^ P0746: Line pressure solenoid system (Drive cur rent range out)
^ P0960: Line pressure solenoid system (Open circuit)
^ P0962: Line pressure solenoid system (Short to ground)
^ P0963: Line pressure solenoid system (Short to power supply)

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
^ FET (Field Effect Transistor) current: 3.5 A or more, and FET (Field Effect Transistor) output: 100 mV or less (10 times).

OBD-II DRIVE CYCLE PATTERN
The current of the FET channel shunt is 3.5 A or less, and the FET channel output is 100 mV or more.

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. P0961 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.