NEXON NEW MCE-2 DCT BS VI DTC Troubleshooting Guide Version: 1.0 Date: 16-06-2023 Author: Akash/Rahul Page:48 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. 13. P0657-19 High side output: over current Overview: ISO Code • P0657-19 Customer Symptom • Critical malfunction. Powertrain is opened. Power loss immediately triggered Fault Effects (On Vehicle) • Transmission Fault Lamp ON • Gearshift disable • Both clutches open Lamp Status (If Any) • Transmission fault lamp ON Fault Detection Condition Internal TCU error; High side valve supply (pins 1, 24, 26) over current. (FFT= 0ms) Normal Operating Condition TCU does not detect over current. High side output at pin 1,24 & 26 regulated at normal current Probable Trouble Area 1. External wiring loom of the transmission for any damage. 2. Damage TCU. 3. Internal wiring loom & hydraulic block of the transmission. 4. Hydraulic block & transmission oil. Healing Condition The reaction is cleared at SW restart if the detection is FALSE for more than 0 ms Component Details: Clutch actuator 1 & 2 mounted in hydraulic control unit and makes internal electrical contact with the TCU. Preliminary Checks: 1) Battery voltage 2) Check for damage or back out of pins at TCU connectors. 3) Check correct fitment of ground cable connections on vehicle chassis (tightness, corrosion of mounting bolts etc.) Trouble Shooting:- Step Checks IF YES IF NO 1. 1. Check the external wiring loom of the transmission for any damage. If wiring loom is damaged, replace the wiring loom. Clear the DTC and check if the DTC does not come back Go to step 2 2. If problem persists, test with replacement TCU & flash the adaption data from the previous TCU. Clear the DTC and check if the DTC does not come back Go to step 3 3 If the fault is also reported in the replacement TCU then check internal wiring loom & hydraulic block of the transmission. If damage is visible, replace the hydraulic block & transmission oil. Go to step 4 4 After replacing the hydraulic block & transmission oil, perform the necessary adaptions. Clear the DTC. ➢ Disconnect Transmission side 28 pole connector (X-201) and check below resistance at (X-201) connector terminal
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