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TIAGO/TIGOR AMT Gasoline
DTC Troubleshooting Guide
Version: 4.0
Date: 18-04-2017
Author: Sathi/Anupama
Page: 335 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.
112.
P0881- 02: TCU 12V Internal Supply – Device Open
Overview:
ISO Code
P0881- 02
Customer Symptom
Transmission Fault Lamp ON,
No gearshifts ,
Vehicle not cranking,
Vehicle not picking up,
sudden shift to neutral while driving,
engine stopping,
gear shift request by lever disabled
Fault Effects (On Vehicle)
No gearshifts ,
Vehicle not cranking,
Vehicle not picking up,
sudden shift to neutral while driving,
engine stopping,
gear shift request by lever disabled
Lamp Status (If Any)
Transmission Fault Lamp ON
Fault Detection Condition
This fault gets detected after Ignition On if the TCU detects
that the +12V internal supply of the TCU is below a threshold.
Normal Operating Condition
+12V supply of the TCU is in a proper range
Probable Trouble Area
TCU damage
Healing Condition
50 milliseconds after valid signal
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
At the first instance of the fault, clear the
DTC and run the vehicle in all gears for
about 10 kms, does the fault recur?
Go to Step 2
Release the vehicle to the
customer after final drive
test
2
Check Battery and Ignition supplies at pins
1,3and 5 respectively. Both are correct?
Go to Step 3
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 Step4
4
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.