Vehicle Platform: NEXON ECU Name: ESCL DTC Troubleshooting Data Version: 1.4 Date: 09 Jan 2018 Author: Hitesh Kaneria Page: 55 of 88 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. B1021-42: Co Processor ROM Error - general memory failure Overview: ISO Code B1021-42 Customer Symptom ESCL will probably not function or will function intermittently or partially Fault Effects (On Vehicle) NA Lamp Status (If Any) None Fault Detection Condition Fault logged in the event of RAM error Normal Operating Condition Normal operating range: ECU will be awake from 6V to 16 V. Full assistance is b/w 11.5 to 16 volts. Reduced assistance is b/w 9 to 11.5 V Probable Trouble Area ESCL internal damage Healing Condition NA Table 18: B1021-42 overview view Component Details: NA Preliminary Checks: 1. Voltage at the battery terminals should be greater than 11.5V. 2. ESCL power supply connector should have greater than 11.5V for full assistance. 3. Check battery cable and ESCL connector terminals for damage. 4. Check ESCL ECU for pin bend/damage. 5. Alternator output voltage should be between 13.5 V to 14.5 V in engine running condition.
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