TIAGO/TIGOR AMT Gasoline DTC Troubleshooting Guide Version: 4.0 Date: 18-04-2017 Author: Sathi/Anupama Page: 360 of 427 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. 124. P1886-07:- Dual port RAM check Overview: ISO Code P1886-07 Customer Symptom No gearshifts , Vehicle not picking up Fault Effects (On Vehicle) No gearshifts , Vehicle not picking up Lamp Status (If Any) Transmission Fault Lamp ON ON (may not be possible to observe) Fault Detection Condition This fault gets detected during initialization of TCU Normal Operating Condition CAN bit integrity is valid during initialization of TCU Probable Trouble Area TCU damage Healing Condition Immediately after detection of valid bit 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 Check Battery and Ignition supplies at pins 1,3and 5 respectively. Both are correct? Go to Step 2 rectify harness connections as per the circuit schematic 2 Is there any pin back out/damage/rust/oxidation observed on TCU Connector? Clean or repair or replace connector Go to Step 3 3 Fault Still Persists? Replace TCU Follow the steps again for reconfirmation . DTC’s confirmation:- After rectification, clear all DTC’s and ensure 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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