TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 312 of 424 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. 99. P0604- 08: TCU ROM Checksum Error * *This particular fault may not be detectable with the diagnostic tool as TCU will fail to run. Overview: ISO Code P0604- 08 Customer Symptom No gearshifts , Vehicle not cranking, Fault Effects (On Vehicle) No gearshifts , Vehicle not cranking, Lamp Status (If Any) Transmission Fault Lamp ON (may not be possible to observe) Fault Detection Condition This fault gets detected during TCU power OFF, if a ROM checksum error is detected by TCU Normal Operating Condition ROM /RAM/Flash memory checksum integrity is valid during Power OFF Probable Trouble Area TCU damage Healing Condition Immediately after detection of valid ROM checksum integrity Component Details: The Problem may occur due to an internal damage to TCU. Preliminary Checks: 1) Battery voltage 2) Check for damage or back out of pins at TCU connectors. 3) Check correct fitment of ground cable connections on vehicle chassis (tightness, corrosion of mounting bolts etc.) . Trouble Shooting:- Step Checks IF YES IF NO 1 Connect the diagnostic tool and check connection status to TCU. Is the TCU responding? Clear the DTC and do Ignition key ON/OFF with full power latch (20 sec). Repeat for 5 times. Repeat step 1, If TCU communicates, clear the fault, test drive the vehicle through all gears and release to customer after final drive test. Go to Step 2 2 Check Battery and Ignition supplies at pins 1,3and 5 respectively. Both are correct? Go to Step 4 rectify harness connections as per the circuit schematic 3 Is there any pin back out/damage/rust/oxidation observed on TCU Connector? Clean or repair or replace connector Go to Step 4 4 Fault Still Persists? Replace TCU Follow the steps again for reconfirmation - the following points by referring TCU parameters using TML diagnostic tool before handing over to customer. Drive the vehicle through all gears in both Automatic and Manual modes Ensure no DTC is active and Transmission Fault Lamp is OFF.
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