TIAGO

TIAGO AMT Gasoline

DTC Troubleshooting Guide

Version: 2.0

Date: 06-06-2016

Author: Sathi/Anupama

Page: 291 of 424

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.

91.

P184A- 01: Hydraulic Circuit Pump Timeout

Overview:

ISO Code

P184A-01

Customer Symptom

Fault Effects (On Vehicle)

May lead to delayed cranking

Lamp Status (If Any)

Transmission Fault Lamp ON

Fault Detection Condition

This fault gets detected after Ignition On when the time of

pump actuation exceeds a threshold.

Normal Operating Condition

Pump actuation time is usually within limits

Probable Trouble Area

kit

Healing Condition

Next power ON of TCU

Component Details:

In an AMT system, the hydraulic pump is driven by the TCU whenever the hydraulic pressure read by sensor drops below a

threshold. In case the driver requests gearshifts too frequently than normal driving conditions, the pump has to activate more

frequently and may lead to overheating.

Preliminary Checks:

1) Loose/ Damaged Connections of Electric Motor and TCU

2) Check for damage or back out of pins at TCU connector, electric motor connector.

3) Check visibly for kit Oil leakage and oil level.

4) Check Battery voltage and state of charge.

5) Check for mechanical damage to the gearbox loose or damaged valve body/TCU mountings, Hydraulic

tank/accumulator, Connecting pipes mechanical fitments

6) Check correct fitment of ground cable connections on vehicle chassis.

Trouble Shooting:-

Step Checks

IF YES

IF NO

Is the DTC occurring in combination with

- P0820/821/822/823/825,

P0945, P0942 or P2712?

Go to Step 2

At first occurrence of the problem, clear the

DTC and drive the vehicle in all gears for

about 10 km simulating /in real dense

traffic condition requiring frequent

gearshifts , does the DTC recur?

Go to Step 3

Release vehicle to the

customer after final drive

test

Check Hydraulic pressure sensor and relay

electrical connections by following same

P0932 & P185C

respectively, Are electrical connections

OK?

Go to Step 4

Establish continuity by

rectifying harness

connections as per the

circuit schematic

Using TCU diagnostic tool, initiate a

hydraulic pump activation routine and

monitor the hydraulic pressure, does the

pump turn ON audibly and hydraulic

pressure is 38-51 bar?

Clear the DTC and drive the

vehicle through all gears for 5

kms ,Recheck the above

steps if fault recurring

If No pump turn ON:

Go to Step 6

If Pump turns ON but no

pressure build up:

Go to Step 6

Check the Electric motor (refer DTC

P185C), are the connections and

grounding proper?

Replace the motor and

recheck step 3,

If problem persists Goto step

Rectify/Replace the motor