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 Page7 C1304-01: Torque Sensor Signal Error Overview: ISO Code C1304-01 Customer Symptom No PSCM functionality (Heavy steering) Fault Effects (On Vehicle) No Assistance Lamp Status (If Any) Warning Lamp ON Fault Detection Condition Following are fault detection conditions, A. SENT1 (Torque Sensor Main Signal) Tick time <= 1.344us or SENT1 Tick time >= 2.015us or SENT1 Nibble > 15 Pre-condition for SENT1 Detection - 4.5V < SVCC1(SENT1 supply voltage) < 5.5V (Tick time can be calculated by sync pulse which has total 56 ticks. Typical duration is 1.344us~2.015us) B. SENT2 (Torque Sensor Sub Signal) Tick time <= 1.344us or SENT2 Tick time >= 2.015us or SENT2 Nibble > 15 Pre-condition for SENT2 Detection - 4.5V < SVCC2(SENT2 supply voltage) < 5.5V (Tick time can be calculated by sync pulse which has total 56 ticks. Typical duration is 1.344us~2.015us) C. Invalid SENT1 signal (0 or 4095) D. Invalid SENT2 signal (0 or 4095) E. The specified number of edges on SENT 1 signal mismatched Pre-condition for SENT1 Detection - 4.5V < SVCC1(SENT1 supply voltage) < 5.5V F. The specified number of edges on SENT2 signal mismatched Pre-condition for SENT2 Detection - 4.5V < SVCC2(SENT2 supply voltage) < 5.5V 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 electrical failure in torque sensor Healing Condition Failure is not detected in the next power cycle
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