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 Page31 C1315-64: Steering Angle Sensor ISO Code C1315-64 Customer Symptom Heavy steering Fault Effects (On Vehicle) Assistance continues to be provided. Active return and End stop disabled Lamp Status (If Any) Warning Lamp OFF ; G/Driver ON ; Motor ON Fault Detection Condition Following are the fault detection conditions, 1. Active return and End stop disabled due to improper PSCM Steering angle calibration. 2. SENT1 vs PWM relative angle differential ±27degree SENT2 vs PWM relative angle differential ±27degree 3. SENT1 vs SENT2 relative angle differential ±2degree 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. s 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 PSCM Steering angle is not calibrated correctly due to mechanical component of steering system is out of tolerance limit. PWM IC failure ,MCU PWM Port failure , PWM short to VCC,PWM short to GND, Steering Angle Sensor Error Healing Condition Failure is not detected in the next IGN cycle Component Details: Steering angle sensor - It measures changes in the steering geometry between the steering wheel and the road wheels. Steering angle sensor calibration permanently stores the current steering wheel position as the straight-ahead position in the steering angle sensor memory. Angle sensor is non contact type hall effect sensor with PWM output. Absolute angle position is available at power on. Preliminary Checks: NA
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