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DTC P0841

BHE050201026W24

DTC P0841 | Oil pressure switch B circuit malfunction
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DETECTION CONDITION | • When driving, hydraulic pressure should be generated in the 2-4 brake, but oil pressure switch B does not turn on. • When driving, hydraulic pressure should not be generated in the 2-4 brake, but oil pressure switch B does not turn off. Diagnostic support note: • This is continuous monitor (CCM). • AT warning light illuminates if TCM detects the above malfunction conditions in two consecutive drive cycles. • PENDING CODE is available. • FREEZE FRAME DATA is available. • MIL does not illuminate. • DTC is stored in TCM memory.
POSSIBLE CAUSE | • Oil pressure switch B malfunction • Open circuit in wiring harness between oil pressure switch B terminal A and TCM terminal 2A • Short to ground in wiring harness between oil pressure switch B terminal A and TCM terminal 2A • Damaged connector between oil pressure switch B and TCM • TCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins and/or on-line repair 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.
3 | INSPECT FOR DTC • Turn the ignition switch to the ON position (engine off). • Inspect for DTCs. • Are any other DTCs output? | Yes | Follow the applicable DTC inspection procedure. (See DTC TABLE [RC4A-EL].)
No | Go to the next step.
4 | INSPECT AT SOLENOID VALVE CONNECTOR FOR POOR CONNECTION • Turn the ignition switch to the LOCK position. • Disconnect the AT solenoid valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair or replace the connector and/or terminal, then go to Step 15.
5 | INSPECT TCM CONNECTOR FOR POOR CONNECTION • Disconnect the TCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair or replace the connector and/or terminal, then go to Step 15.
6 | INSPECT TCM CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the TCM (wiring harness-side) terminal 2A and AT solenoid valve connector (wiring harness-side) terminal B. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 15.
7 | INSPECT TCM CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the TCM (wiring harness-side) terminal 2A and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to Step 15.
No | Go to the next step.
8 | INSPECT CONTROL VALVE BODY CONNECTOR FOR POOR CONNECTION • Disconnect the control valve body connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair or replace the connector and/or terminal, then go to Step 15.
9 | INSPECT AT SOLENOID VALVE CONNECTOR CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the AT solenoid valve connector (transmission case side) terminal B and control valve body (wiring harness-side) terminal H. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 15.
10 | INSPECT TCM CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the AT solenoid valve connector (transmission case-side) terminal B and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to Step 15.
No | Go to the next step.
11 | INSPECT OIL PRESSURE SWITCH B CONNECTOR FOR POOR CONNECTION • Disconnect the oil pressure switch B connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the connector and terminals normal? | Yes | Go to the next step.
No | Repair or replace the connector and/or terminal, then go to Step 15.
12 | INSPECT CONTROL VALVE BODY CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the control valve body (part-side) terminal H and oil pressure switch B (wiring harness-side) terminal A. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 15.
13 | INSPECT CONTROL VALVE BODY CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the control valve body connector (wiring harness-side) terminal B and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to Step 15.
No | Go to the next step.
14 | INSPECT OIL PRESSURE SWITCH B • Inspect oil pressure switch B. (See OIL PRESSURE SWITCH INSPECTION (AT).) • Is the oil pressure switch B normal? | Yes | Go to the next step.
No | Replace the oil pressure switch B, then go to the next step. (See OIL PRESSURE SWITCH REMOVAL/INSTALLATION (AT).)
15 | VERIFY TROUBLESHOOTING OF DTC P0841 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the TCM memory using the WDS or equivalent. • Drive the vehicle and make sure that the gears shift smoothly from 1GR to 4GR. • Is the same DTC present? | Yes | Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION.)
No | Go to the next step.
16 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [RC4A-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [RC4A-EL].)
No | DTC troubleshooting completed.