fluid pressure switch A (2nd clutch) and the PCM, then go to step 1 and recheck. If the PCM was updated,
substitute a known-good PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE , and
check the OBD STATUS again.
NOT COMPLETED Repair verification is incomplete. Meet the test condition, and check the OBD STATUS
again.
DTC P0843: TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH)
CIRCUIT HIGH
Fig. 53: DTC Troubleshooting Flow Chart (P0843)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot with
the HDS, and review the General Troubleshooting Information See HOW TO
TROUBLESHOOT THE A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL
AND EMISSIONS SYSTEMS .
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P0843 Transmission Fluid Pressure Switch A (2nd Clutch)
Circuit High
1. 2nd Pressure Switch signal check:
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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
4. Shift the transmission to 2nd gear while pressing the brake pedal, and check if the Shift Control
indicates 2 with the HDS in the A/T Data List.
Current conditions
Signal
Values
Unit
Shift Control
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5. Check the parameter(s) below with the HDS.
Threshold Current conditions
Signal
Values Unit Values
Unit
2nd Pressure Switch ON
Do the current condition(s) match the threshold?
YES : The 2nd Pressure Switch signal is OK. Go to step 2.
NO : Go to step 3.
2. Problem verification:
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1. Test-drive the vehicle in 2nd gear for at least 2 seconds.
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2. Monitor the OBD STATUS for P0843 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P0843 Transmission Fluid Pressure Switch A (2nd Clutch) Circuit High
Does the HDS indicate FAILED?
YES : The failure is duplicated. Go to step 3.
NO : If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor
connections or loose terminals between transmission fluid pressure switch A (2nd clutch) and the PCM. If
the HDS indicates NOT COMPLETED, test-drive again.
3. Transmission fluid pressure switch A (2nd clutch) check:
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1. Turn the ignition switch to LOCK (0).
2. Disconnect the following connector.
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Transmission fluid pressure switch A (2nd clutch) 1P connector
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3. Turn the ignition switch to ON (II).
4. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Transmission fluid pressure switch A (2nd clutch) 1P connector: disconnected
Test circuit OP 2 SW
Test point 1 Transmission fluid pressure switch A (2nd clutch) 1P connector No. 1 (RED)
Test point 2 Body ground
Fig. 54: Measuring Voltage Between Transmission Fluid Pressure Switch A (2nd Clutch) 1P
Connector No. 1 (RED) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there about 5 V?
YES : Replace transmission fluid pressure switch A (2nd clutch) , then do the repair verification .
NO : Go to step 4.
4. Open wire check (OP 2 SW line):
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1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect the following connector.
PCM connector B (49P)
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4. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
Transmission fluid pressure switch A (2nd clutch) 1P connector: disconnected
PCM connector B (49P): disconnected
Test circuit OP 2 SW
Test point 1 Transmission fluid pressure switch A (2nd clutch) 1P connector No. 1 (RED)
Test point 2 PCM connector B (49P) No. 19 (RED)
Fig. 55: Checking Continuity Between Transmission Fluid Pressure Switch A (2nd Clutch) 1P
Connector No. 1 (RED) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The OP 2 SW wire is OK. Update the PCM if it does not have the latest software See PCM
REMOVAL AND INSTALLATION or PCM UPDATE , or substitute a known-good PCM See
PCM REMOVAL AND INSTALLATION or PCM UPDATE , then do the repair verification .
NO : Repair an open in the OP 2 SW wire between transmission fluid pressure switch A (2nd clutch) and
the PCM, then do the repair verification .
REPAIR VERIFICATION (OBD STATUS CHECK)
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1. Reconnect all connectors.
2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
5. Test-drive the vehicle in 2nd gear for at least 2 seconds, then drive in 4th gear for at least 2 seconds.
6. Monitor the OBD STATUS for P0843 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P0843 Transmission Fluid Pressure Switch A (2nd Clutch) Circuit High
Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?
PASSED Troubleshooting is complete. If the PCM was substituted, replace the original PCM See PCM
REMOVAL AND INSTALLATION or PCM UPDATE . Check for other DTC after this troubleshooting. If
any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.
FAILED Troubleshooting is incomplete. Check for poor connections or loose terminals between transmission
fluid pressure switch A (2nd clutch) and the PCM, then go to step 1 and recheck. If the PCM was updated,
substitute a known-good PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE , and
check the OBD STATUS again.
NOT COMPLETED Repair verification is incomplete. Meet the test condition, and check the OBD STATUS
again.
DTC P0847: TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH)
CIRCUIT LOW
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