NEXON 3.0 EV DTC Troubleshooting Document for VCU Version: 2.0 Date: 22-Sep-2023 Copyright © TATA MOTORS Ltd. This document must not be used in anyway, such as copying and redistributing to third parties, without the consent of author. Step No. Description Check point If yes If No 1. Switch Vehicle to Ignition ON Mode Check for the fault code using TML diagnostic tool. If P30B8 -12 is present? Go to Step 2 Check if any other fault related to P30B8 is present 2. Remove the LV connector of AC Linear pressure sensor side i.e., C699A. Check for the power supply of AC Linear pressure sensor Check if AC Linear pressure sensor pin 1 (Connector C699A- pin 1) has supply voltage 5V and Pin 3 (Connector C699A- pin 3) is ground. Go to Step 3 Check for the harness damage 3. Switch vehicle Ignition OFF. Remove the LV battery connector to disconnect the LV battery. Vehicle is in Ignition OFF mode? Go to step 4 Go to step 3 4. Check whether there is internal short in sensor Check if there is continuity between AC Linear pressure sensor’s input pin 2 and AC Linear pressure sensor’s supply pin 1. (Refer pin diagram) Problem is in the AC Linear pressure sensor. Action: Replace the sensor and go to step 1. Go to Step 5 5. Remove the LV connector of AC Linear pressure sensor side i.e., C699A (Refer schematic for details) Check the connectivity between C699A-2 (analog output) to C699A-1(supply) Check the connectivity between C776B-63 to C776B-54 Problem is with wiring harness between VECU and sensor Action: Replace the wiring harness and go to step 4 Go to Step 6
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