TIAGO/TIGOR AMT Gasoline DTC Troubleshooting Guide Version: 4.0 Date: 18-04-2017 Author: Sathi/Anupama Page: 90 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. 27. P0825 -01: Gear Lever Sensor Circuit– Misuse Overview: ISO Code P0825-08 Customer Symptom Transmission Fault Lamp ON, Creeping inactive, Transmission going automatically to neutral from gear when coming to halt after drive. Vehicle not cranking Fault Effects (On Vehicle) Creeping inactive, Transmission going automatically to neutral from gear when coming to halt after drive. Vehicle not cranking Lamp Status (If Any) Transmission Fault Lamp ON Fault Detection Condition This fault gets detected after Ignition On if the gear lever is locked in an unstable position (tapup/tapdn) for a long duration Normal Operating Condition Unstable positions are expected for only a brief durations Probable Trouble Area Wiring Harness Connections / Sensor / TCU Healing Condition 1500 milliseconds after valid sensor signal Component Details: The Gear Lever outputs four hall sensor signals which encode the position of the Gear lever. Preliminary Checks: 1) Loose/ Damaged Connections between Sensors and TCU. 2) Check for damage or back out of pins at Gear lever connector and TCU connector. 3) Check correct fitment of ground cable connections on vehicle chassis. 4) Check mechanical operation of gear shift lever (latching at each position R/N/A/M), specifically check for play or looseness in lever operation. Trouble Shooting:- Step Checks IF YES IF NO 1 Check the movement of the gear lever from “M” position to “+” and “-“ positions, ensure that the lever returns with spring action back to “M” position without getting stuck at these positions. Is the lever getting stuck sometimes? See if there is any object/deposit stuck in the lever inhibiting free movement, clean it, if internal damage to lever then replace it. Go to Step 2 2 Is there any rust/oxidation observed on Sensor Terminals (GSL connector) Clean the Rust or repair or replace Go to Step 3 3 Is there wiring harness electrical continuity between TCU pins to GSL Lever connector pins. Go to Step 4 Establish continuity by rectifying harness connections as per the circuit schematic 4 Are there any pins damaged at GSL lever connector or TCU Connector Replace the connector or wiring harness. Go to step 5 5 Are there any pins backed out from the GSL lever or TCU Connector Rectify/Replace Connectors Go to Step 6
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