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DTC P099B: Low-Reverse Brake Shift Solenoid Valve System (Short circuit)
DTC P099C: Low-Reverse Brake Shift Solenoid Valve System (Open circuit)
 
 
 
 
DTC SET CONDITIONS
  • When the battery voltage is 2 V or more, the short circuit is detected for 0.5 second. <P099B>
  • When the battery voltage is 2 V or more, the open circuit is detected for 0.5 second. <P099C>
 
 
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)
  • 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
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
LOGIC FLOW CHARTS (Monitor Sequence) <P099B>
 
 
LOGIC FLOW CHARTS (Monitor Sequence) <P099C>
 
 
DTC SET CONDITIONS
Check Conditions <Circuit continuity ground>
  • Transmission relay voltage: 2 volts or more.
  • Low-reverse brake shift solenoid valve activation command: ON
Judgment Criteria <Circuit continuity ground>
  • Low-reverse brake shift solenoid valve actual voltage: less than 3.7 V (0.5 second)
Check Conditions <Circuit continuity open>
  • Transmission relay voltage: 2 volts or more.
  • Low-reverse brake shift solenoid valve activation command: OFF
Judgment Criteria <Circuit continuity open>
  • Low-reverse brake shift solenoid valve actual voltage: 3.7 V or more (0.5 second)
 
 
OBD-II DRIVE CYCLE PATTERN
With the ignition switch ON, maintain the status for 10 seconds or more.
 
 
PROBABLE CAUSES
  • Malfunction of the low-reverse brake shift solenoid valve system circuit
  • Damaged harness or connector
  • Malfunction of the TCM
  • Malfunction of the low-reverse brake shift solenoid valve (valve body assembly)

 
 
DIAGNOSIS
STEP 1. Check the TCM terminal voltage.
[TCM connector (harness side, connected)]
Measure the voltage between the LRSS terminal and body ground.
  • Reverse and 1st coast: Battery positive voltage
  • Other than above: 0 V
Is the check result normal?
Go to Step 5.
Go to Step 2.
 
STEP 2. Check for continuity in LRSS line between the TCM connector and the A/T control solenoid valve assembly.
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 low-reverse brake shift 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 low-reverse brake shift 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.