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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 441 of 654
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.
P301A: TCU Crank Enable Signal Mismatch
Overview:
ISO Description
TCU Crank Enable Signal Mismatch
Customer Symptom
Vehicle may or may not crank
Fault Effects (On Vehicle)
Vehicle may or may not crank
Lamp Status (If Any)
-
Fault Detection Condition
This fault gets logged if mismatch found between crank enable signal
send by TCU through CAN and Hardwired
Normal Operating Condition
Healthy CAN communication between EMS ECU and TCU, Crank Enable
Hardwired input connections are as per schematic.
Probable Trouble Area
Wiring Harness Connections between EMS and TCU (Crank Enable
Signal), CAN bus OFF / CAN error passive, TCU Hardware, TCU
disconnected from CAN network
Component Details:
In vehicles fitted with Automated manual transmission gearboxes, Transmission control unit (TCU) provides EMS ecu the
crank enable signal for engaging starter Motor after ensuring that Vehicle is in Neutral gear and Brake pedal is pressed.
EMS to energize the starter relay only if Crank enable signal from TCU is received.
Preliminary Checks:
x
Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If
yes, go ahead with next steps. If not, check for other DTC’s presence.
x
Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to
earlier issue closure.
x
Ensure that TCU is connected in the vehicle
x
Ensure that TCU and EMS are getting power supply and ground.
x
Check for damage / back out of pins at EMS and TCU Connectors. If found rectify / replace.
Trouble Shooting:
Step Checks
IF YES
IF NO
1.
Check for any CAN bus related DTC’s. DTC’s present?
Rectify them by
Following their
rectification
Procedure
Go to Step 2
2.
Check for any pin back out at EMS ecu connector and also
check whether the TCU is connected properly to the TCU
connector. Check the wiring harness between EMS ECU
and TCU. Any problem found?
Rectify/Replace the
Connector if found
faulty.
Go to Step 3
3
Check whether EMS ecu pin 17 is shorted to GND or
Battery.
Rectify the wiring
harness connections Go to Next step