HARRIER BOOK 2

Vehicle Platform: NEXON

ECU Name: ESCL

DTC Troubleshooting Data

Version: 1.4

Date: 09 Jan 2018

Author: Hitesh Kaneria

Page: 53 of 88

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.

B1020-42: Co Processor RAM Error - general memory failure

Overview:

ISO Code

B1020-42

Customer Symptom

ESCL will probably not function or will function intermittently or partially

Fault Effects (On Vehicle)

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

Table 17: B1020-42 overview details

Component Details:

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.