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DTC P0973: Malfunction of the Low Brake Solenoid Valve (short to ground)
 
 
 
 
DIAGNOSTIC FUNCTION
If a predetermined current does not flow into the low brake solenoid valve (short to ground), the TCM will determine the system is defective.
 
 
DESCRIPTIONS OF MONITOR METHODS
Owing to short to ground, more current than predetermined flows into the low brake solenoid valve drive circuit.
 
 
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)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions
  • Voltage of battery: 10 volts or more.
  • Voltage of battery: 16.5 volts or less.
Judgment Criteria
  • A current of at least 1.78 A flows into the low brake solenoid valve drive circuit for 0.5 seconds.
 
 
OBD-II DRIVE CYCLE PATTERN
Ignition switch: "ON" position (start the engine and keep it for 5 seconds or more)
 
 
PROBABLE CAUSES
  • Malfunction of the valve body assembly (Defective low brake solenoid valve)
  • Damaged wiring harness and connectors
  • Malfunction of TCM
 
 
DIAGNOSIS
STEP 1. Check the following connector
  • CVT assembly connector
  • TCM connector
Check the terminals for a contact status problem and internal short circuit.
Is the check result normal?
Go to Step 2.
Repair the defective connector(s).
 
STEP 2. Check for short to ground in LBLS line between the CVT assembly connector and the TCM connector
Is the check result normal?
Go to Step 3.
Repair the wiring harness.
 
STEP 3. Low brake solenoid valve check
Refer to .
Is the check result normal?
Go to Step 4.
Replace the valve body assembly (Refer to ).
 
STEP 4. Symptom recheck after erasing diagnostic trouble code
Is the diagnostic trouble code stored?
Replace the TCM (Refer to ).
Intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunctions .).