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 Page11 C1305-02: Steering Angle Sensor Internal Electronic Failure Overview: ISO Code C1305-02 Customer Symptom No PSCM functionality (Heavy steering) Fault Effects (On Vehicle) Active Return and SW end stop functionalities are not available. Lamp Status (If Any) Warning Lamp OFF ; G/Driver ON ; Motor ON Fault Detection Condition Following are fault detection conditions, A. When difference between absolute angle from SAS sensor under detected “straight driving condition” is bigger than 50 deg. Pre-condition - Normal SAS output AND 4.55V < SVCC3(TAS PWM supply voltage) < 5.5 V B. SAS PWM period > normal range (4.362 ~ 5.777ms) Pre-condition - PWM signal normal AND 4.55V < SVCC3(TAS PWM supply voltage) < 5.5 V C. SAS PWM duty Range < 10% or > 90% Pre-condition - PWM signal normal AND 4.55V < SVCC3(TAS PWM supply voltage) < 5.5 V D. SAS PWM signal absent Pre-condition - 4.55V < SVCC3(TAS PWM supply voltage) < 5.5 V E. SVCC3 (TAS PWM supply voltage) > 5.5V OR < 4.55V Pre-condition – SVCC3 Drive On 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 Internal signal (signal out of range) failure in steering angle sensor due to following reasons, A. SAS module failure / Initialization at non neutral angle / misSAS position caused by impact B. PWM IC failure in sensor, MCU PWM Port failure, PWM poor contact, PWM short to VCC, PWM short to GND, Poor or broken regulator, External components failure Healing Condition Failure is not detected in the next IGN cycle
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