NEXON NEW MCE-2 DCT BS VI DTC Troubleshooting Guide Version: 1.0 Date: 16-06-2023 Author: Akash/Rahul Page:205 of 645 Copyright ©TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. 57. P0840-65 Pressure sensor 1 message timeout Overview: ISO Code P0840-65 Customer Symptom • Transmission fault lamp ON • Gearshift disable • Engine vibration • Park & N display on cluster • Creep disable • Crank disable Fault Effects (On Vehicle) • Transmission fault lamp ON • Gearshift disable • Engine vibration • Park & N display on cluster • Creep disable • Crank disable Lamp Status (If Any) Transmission fault lamp ON Service indication 0x2 Fault Detection Condition No signal received for 100ms Normal Operating Condition TCU does not detect any fault Probable Trouble Area 1. Transmission wiring loom. 2. Hydraulic block & transmission oil. 3. TCU. Healing Condition The reaction is cleared at SW restart if the detection is FALSE for more than 0 ms Component Details: Pressure sensor used in control circuit of each clutch.clutch actuation model enables the actuation of the clutches via pressure, in order toprecisely control the torque transferred by them. Preliminary Checks: 1) Loose/ Damaged Connections between Electro valve and TCU. 2) Loose/ Damaged mechanical fitments of TCU (TCU to valve body mounting). 3) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- Step Checks IF YES IF NO 1 Check the transmission wiring loom. If damaged, replace the transmission wiring harness. Is there any rust/oxidation/pin back out observed on TCU PIN 8 (Clutch 2/"clutch" pressure sensor) in transmission side TCU 28 pole connector? Clear the DTC and check if the DTC does not come back. Go to step 2 2 If the issue persists, replace the hydraulic block & transmission oil. Perform all the necessary transmission adaptions. Clear the DTC and check if the DTC does not come back. Go to step 3 3 Replace the TCU if the problem persists & flash the adaption data from the previous TCU. Clear the DTC and check if the DTC does not come back.
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