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DTC P0846: 2-6 Brake Pressure Switch System
 
 
 
 
DESCRIPTIONS OF MONITOR METHODS
With the solenoid failure not detected and during 2nd or 6th gear driving, the switch OFF status continues for 2 seconds. (The detection is achieved twice during 1 driving cycle*1, and it continues for 2 driving cycles.)
*1: Indicates the series of driving cycle "ignition key OFF → ON → drive → OFF." The "1 driving cycle," "2 driving cycle," and so on indicates how many cycles are required to detect a failure.
 
 
MONITOR EXECUTION
  • Transmission range switch position: R, D, L
  • Engine speed: 305 r/min or more
  • A/T fluid temperature: -40°C (-40°F) or more
 
 
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 <Stuck-off>
  • Transmission range switch position: D
  • Gear position: 2nd, 6th
  • Time after shift changing finish: 2 seconds or more
Judgment Criteria <Stuck-off>
  • 2-6 brake pressure switch status: OFF (2 seconds × 2 times)
Check Conditions <Stuck-on>
  • Transmission range switch position: D or R
  • Gear position: 1st, 3rd, 4th, 5th, reverse
  • Time after shift changing finish: 2 seconds or more
Judgment Criteria <Stuck-on>
  • 2-6 brake pressure switch status: ON (2 seconds × 2 times)
 
 
OBD-II DRIVE CYCLE PATTERN
Drive in 2nd and 6th gears for 2 seconds or more.
 
 
PROBABLE CAUSES
  • Malfunction of the 2-6 brake pressure switch system circuit
  • Damaged harness or connector
  • Malfunction of the TCM
  • Malfunction of the 2-6 brake pressure switch (valve body assembly)
  • Malfunction of the valve body assembly, abnormal hydraulic circuit valve.
cautionFor the incomplete gear shifting and slippage, first refer to the SYMPTOM CHART .

 
 
DIAGNOSIS
STEP 1. Check the DTC.
Is the DTC other than the pressure switch stored? (Is the code other than P0846, P0876, and P0988 stored?)
Check and repair the relevant DTC system.
Go to Step 2.
 
STEP 2. Check the TCM terminal voltage.
[TCM connector (harness side, connected)]
Measure the voltage between 26PS terminal and body ground.
  • 2-6 brake engaged: 0 V
  • Other than above: Battery positive voltage
Is the check result normal?
Go to Step 3.
Go to Step 7.
 
STEP 3. Check for continuity in 26PS 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 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Check the TCM, A/T control solenoid valve assembly connector pin terminals, and the connection status.
Is the check result normal?
Go to Step 5.
Repair or replace the failure section.
 
STEP 5. Check for continuity in signal line between the A/T control solenoid valve assembly connector and the 2-6 brake pressure switch 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 6.
Repair the connector(s) or wiring harness.
 
STEP 6. Check the 2-6 brake pressure switch body ground.
Check for continuity between the 2-6 brake pressure switch body and ground.
  • Between the 2-6 brake pressure switch body and body ground: Continuity exists.
Is the check result normal?
Replace the valve body assembly, and then go to Step 8.
Repair or replace the failure section.
 
STEP 7. Check the TCM, A/T control solenoid valve assembly connector pin terminals, and the connection status.
Is the check result normal?
Go to Step 9.
Repair or replace the failure section.
 
STEP 8. 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.
Replace the TCM.
 
STEP 9. 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.