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DTC P0976: 2-6 Brake Linear Solenoid Valve System (Short circuit)
DTC P0977: 2-6 Brake Linear Solenoid Valve System (Open circuit)
 
 
 
 
DESCRIPTIONS OF MONITOR METHODS
  • During 2nd or 6th gear driving, an abnormal value equivalent to short circuit is detected in the solenoid control current for 1 second. <P0976>
  • During 2nd or 6th gear driving, an abnormal value equivalent to open circuit is detected in the solenoid control current for 5 seconds. <P0977>
 
 
MONITOR EXECUTION
  • 2nd or 6th gear driving
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • P0731: 1st gear incorrect ratio
  • P0732: 2nd gear incorrect ratio
  • P0733: 3rd gear incorrect ratio
  • P0734: 4th gear incorrect ratio
  • P0735: 5th gear incorrect ratio
  • P0729: 6th gear incorrect ratio
  • P0846: 2-6 brake pressure switch system
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions <P0976>
  • Gear position: 2nd or 6th.
Judgment Criteria <P0976>
  • 2-6 brake linear solenoid valve actual current: more than 1.7 A (1 second)
Check Conditions <P0977>
  • Gear position: 2nd or 6th.
  • 2-6 brake linear solenoid valve activation command: more than 937 mA
Judgment Criteria <P0977>
  • 2-6 brake linear solenoid valve actual current: less than 500 mA. (5 seconds)
 
 
OBD-II DRIVE CYCLE PATTERN
Drive in 2nd or 6th gear. Maintain each shift range for 10 second or more.
 
 
PROBABLE CAUSES
  • Malfunction of the 2-6 brake linear solenoid valve system circuit
  • Damaged harness or connector
  • Malfunction of the TCM
  • Malfunction of the 2-6 brake linear solenoid valve (valve body assembly)

 
 
DIAGNOSIS
STEP 1. Check the TCM terminal voltage.
[TCM connector (vehicle side, connected)]
Measure the voltage between the 26LS terminal and body ground.
  • 2-6 brake engaged (2nd and 6th gear): 300 Hz
  • Other than above: 0 V
Is the check result normal?
Go to Step 5.
Go to Step 2.
 
STEP 2. Check for continuity in 26LS line between the TCM connector and A/T control solenoid valve assembly connector.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check the 2-6 brake linear solenoid.
Refer to .
Is the check result normal?
Go to Step 6.
Go to Step 4.
 
STEP 4. Check for continuity in signal line between the A/T control solenoid valve assembly connector and the 2-6 brake linear solenoid valve connector.
Is the check result satisfactory?
Replace the valve body assembly.
Repair the connector(s) or wiring harness.
 
STEP 5. Check the TCM and A/T control solenoid valve assembly connector pin terminals and the connection status.
Is the check result normal?
Go to Step 7.
Repair or replace the failure section.
 
STEP 6. Check the TCM and A/T control solenoid valve assembly connector pin terminals and the connection status.
Is the check result normal?
Replace the TCM.
Repair or replace the failure section.
 
STEP 7. Erase the DTC, and drive the vehicle for a while.
Check that the normal code is displayed.
Is the check result normal?
The procedure is complete.
Return to Step 1.