Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 389 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 P0638-A2 - Throttle Actuator Control Range/Performance Bank 1 - UnderVoltage Overview: Code Cause Effect on Vehicle Fault Code: P0638-A2 1. Throttle connector loose connection 2. Electrical wiring damage 3. ECU hardware failure 4. Throttle malfunctioning 1.CE Lamp ON 2. Reduced vehicle performance 3. Disabled drive mode option Lamp status: Check Engine Lamp on Malfunction Indicator Lamp off Checkpoints: 1. Check Electrical connections Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check whether the Intake throttle actuator connector is connected properly. Remove and connect again properly - Step 2 Check for continuity between sensor connector pins 1, 2, 3, 5 and ECU pins A87, A66,A42,A60 respectively. Check supply voltage of 12 V at throttle actuator connector pin no.4 - Step 3 Check the Intake throttle physically for any damage - Step 4 If the problem persists, replace the ECU - Circuit Description: ECM in accordance with engine and driving conditions gives an electric output to directly drive a DC motor (Part of Throttle valve) which in turn drives the Throttle valve. Hence ECM indirectly controls the opening and closing of Throttle valve.
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