Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 482 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent P04FD- A2: EGR Actuator "A" Control Processor Performance Under Voltage Overview: Code Cause Effect on Vehicle Fault Code: P04FD- A2 1. Low Voltage detected internally by ECU 2. ECU hardware malfunction 1. CE Lamp ON Lamp status: Check Engine Lamp on Malfunction Indicator Lamp off Checkpoints: Check battery voltage at Ignition off (Nominal range – 11.5V to 12.8V) Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check if ECU connector is connected properly - Step 2 Check if all sensor connectors are connected properly & working correctly - Step 3 If the problem persists, replace the ECU - Circuit Description: ECM continuously monitors its internal memory status, internal circuits. These are basically self-checks that ensure that ECM is functioning properly. If any malfunction is detected, ECM will set the DTC. ECM is supplied voltage from the battery positive supply through Main relay. ECM ground connection is connected to the battery negative supply. ECM functionality critically depends on ensuring proper ground connection.
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