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DTC P1764

BHE050201026W29

DTC P1764 | Low and reverse brake fail-safe valve malfunction
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DETECTION CONDITION | • TCM detects low and reverse brake fail-safe valve malfunction. 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 | • Stuck low and reverse brake fail-safe valve • Oil pressure switch F stuck on • Short to ground in oil pressure F system wiring harness • Poor connection of connectors in oil pressure switch F system wiring harness

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 ATF CONDITION • Turn the ignition switch to the LOCK position. • Inspect ATF condition. – Transparent red: Normal – Milky: Water mixed in fluid – Reddish brown: Deteriorated ATF • Is it normal? (See Automatic Transmission Fluid (ATF) Condition Inspection.) | Yes | Replace the control valve body, then go to the next step. (See CONTROL VALVE BODY REMOVAL.) (See CONTROL VALVE BODY INSTALLATION.)
No | If the ATF color milky or reddish brown, repair or replace AT, then go to the next step.
5 | VERIFY TROUBLESHOOTING OF DTC P1764 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the TCM memory using the WDS or equivalent. • Drive the vehicle in D range 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.
6 | 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.