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PSCM
DTC Troubleshooting Guide for Nexon
Version: 1.1
Date: 21/06/2017
Author: E&E Chassis - ERC
Page: 87 of 156
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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.
C1323 - 00: Control module input power “A” circuit voltage below critical threshold
Overview:
This fault will come in engine running condition only
Input Power "A" is the Voltage Supply from battery
ISO Code
C1323-00
Customer Symptom
No PSCM functionality (Heavy steering)
Fault Effects (On Vehicle)
No assistance
Lamp Status (If Any)
Warning Lamp ON
Fault Detection Condition
1) Low voltage from fuse box
2) High resistance within supply line
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 16 V.
Full assistance is b/w 10V to 16V
Reduced assistance is b/w 8.7V to 10V
Drive motor “A” phase current b/w 0 to 60 Amp
Probable Trouble Area
Discharged Battery
Fuse blown (60 amp)
Battery cable terminal (corroded/Sulphation/Loose)
Alternator is undercharging
High resistance within the supply cable.
Loose PSCM power connector etc.
Healing Condition
NA
Component Details:
NA
Preliminary Checks:
1. Voltage at the battery terminals should be greater than 11.5V.
2. PSCM power supply connector should have greater than 11.5V for full assistance.
3. Check battery cable and PSCM connector terminals for damage.
4. Check PSCM ECU for pin bend/damage.
5. Alternator output voltage should be between 13.5 V to 14.5 V in engine running condition.