DTC P0843:00 [DJVA-EL]

id0502l1822700

DTC P0843:00

Oil pressure sensor power supply circuit short to GND, power supply short circuit
DETECTION CONDITION
•  Condition: TCM normal during engine rotation
•  Status: Open or short circuit detected in power supply circuit
•  Period: Confirmed 100 times in 0.1 s or more
Diagnostic support note
•  The AT warning light illuminates if the TCM detects the above malfunction condition during the first drive cycle.
•  PENDING CODE is not available.
•  The DTC is stored in the TCM memory.
POSSIBLE CAUSE
•  Oil pressure sensor connector or terminal malfunction
•  Short to GND in wiring harness for oil pressure sensor terminal C and TCM terminal A20
•  Short to GND in wiring harness for oil pressure sensor terminal B and TCM terminal A3
•  Short to GND in wiring harness for oil pressure sensor terminal A and TCM terminal A10
•  Short to power supply in wiring harness for oil pressure sensor terminal C and TCM terminal A20
•  Short to power supply in wiring harness for oil pressure sensor terminal B and TCM terminal A3
•  Short to power supply in wiring harness for oil pressure sensor terminal A and TCM terminal A10
•  Oil pressure sensor malfunction
•  TCM connector or terminal malfunction
•  Open circuit in wiring harness for oil pressure sensor terminal C and TCM terminal A20
•  Open circuit in wiring harness for oil pressure sensor terminal B and TCM terminal A3
•  Open circuit in wiring harness for oil pressure sensor terminal A and TCM terminal A10
•  TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
INSPECT OIL PRESSURE SENSOR CONNECTOR FOR POOR CONNECTION
•  Switch the ignition to OFF.
•  Disconnect the oil pressure sensor connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 8.
No
Go to the next step.
3
INSPECT OIL PRESSURE SENSOR CIRCUIT FOR SHORT TO GND
•  Switch the ignition to OFF.
•  Inspect for continuity between the following circuits:
―  Oil pressure sensor terminal C (wiring harness-side) and body GND
―  Oil pressure sensor terminal B (wiring harness-side) and body GND
―  Oil pressure sensor terminal A (wiring harness-side) and body GND
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
No
Go to the next step.
4
INSPECT OIL PRESSURE SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Switch the ignition to ON. (engine off).
•  Measure the voltage between the following circuits:
―  Oil pressure sensor terminal C (wiring harness-side) and body GND
―  Oil pressure sensor terminal B (wiring harness-side) and body GND
―  Oil pressure sensor terminal A (wiring harness-side) and body GND
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to GND, then go to Step 8.
No
Go to the next step.
5
INSPECT OIL PRESSURE SENSOR
•  Inspect the oil pressure sensor
•  Is there any malfunction?
Yes
Perform the following procedure, then go to Step 8.
1.  Replace the oil pressure sensor.
2.  Perform oil pressure sensor learning.
No
Go to the next step.
6
INSPECT TCM CONNECTOR FOR POOR CONNECTION
•  Switch the ignition to OFF.
•  Disconnect the TCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 8.
No
Go to the next step.
7
INSPECT OIL PRESSURE SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition to OFF.
•  Inspect for continuity between the following circuits:
―  Oil pressure sensor terminal C (wiring harness-side) and TCM terminal A20 (wiring harness-side)
―  Oil pressure sensor terminal B (wiring harness-side) and TCM terminal A3 (wiring harness-side)
―  Oil pressure sensor terminal A (wiring harness-side) and TCM terminal A10 (wiring harness-side)
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
No
Go to the next step.
8
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all the disconnected connectors.
•  Clear the DTC using the M-MDS.
•  Perform the following procedure to ensure that the DTC has been resolved:
1.  Start the engine.
2.  Idle the engine for 11 s or more.
•  Is the same DTC present?
Yes
Perform the following procedure, then go to next step.
1.  Replace the TCM.
2.  Perform TCM learning.
No
Go to the next step.
9
VERIFY NO DTCs ARE PRESENT
•  Perform the “Reading DTCs Procedure”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [DJVA-EL].)
No
DTC troubleshooting completed.