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. PSCM DTC Troubleshooting Guide for Mando EPAS Version: 1.1 Date: 14/01/2019 Author: E&E Chassis - ERC Page15 C1314-01: SENT Difference Error Overview: ISO Code C1314-01 Customer Symptom No PSCM functionality (Heavy steering) Fault Effects (On Vehicle) No assistance Lamp Status (If Any) Warning Lamp ON ; G/Driver OFF ; Motor OFF Fault Detection Condition (SENT1 torsion angle – SENT2 torsion angle) >= 1.0deg (0.5Nm) Pre-condition – (For SENT1 Detection) SENT1 Normal (Nibble, CRC, Sync, valid) AND 4.5V < SVCC1(SENT1 supply voltage) < 5.5V normally (For SENT2 Detection) SENT2 Normal (Nibble, CRC, Sync, valid) AND 4.5V < SVCC2(SENT2 supply voltage) < 5.5V normally Normal Operating Condition PSCM should provide assist if steering wheel is steered after engine is cranked. Normal operating range: ECU will be awake from 6V to 24V. Full assistance is b/w 10V to 18V Low volt. reduced assistance is b/w 8.3V to 10V High volt. reduced assistance is b/w 18V to 24V Probable Trouble Area SENT1 (Torque Sensor Main Signal) or SENT2 (Torque Sensor Sub Signal) Micro control unit (MCU) failure, MCU DMA port failure Healing Condition Failure is not detected in the next IGN cycle Component Details: Steering Torque Sensor – The torque sensor detects the twist of the torsion bar and converts the applied torque into an electrical signal. The PSCM ECU uses that signal to calculate the amount of power assist the DC motor should provide. Preliminary Checks: 1. Check visually torque sensor connector and wiring harness to PSCM ECU for any damage/open. In case of damage replace the steering column. 2. Visually check ECU torque sensor connector for damage. In case of damage replace the ECU.
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