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Nexon Gasoline – EMS ECU Bosch
DTC Troubleshooting Manual
Version: 0.1
Date: 26-08-2017
Prepared By: Sunu S Babu/Yogesh Jadhav
Checked By: Yeshwant Jadhav
Approved By: Satish Kumar
Document Part No: 2921 02 224 A1736
Page: 492 of 1203
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.
Trouble Shooting:-
Step Checks
IF YES
IF NO
1.
Is there any rust/oxidization observed on Sensor Terminals Clean the Rust or
repair or replace
Go to Step 2
2. Is there wiring harness electrical continuity between ECU
pins237,238 & Knock Sensor connector pins 1,2.
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
3. Are there any pins damaged at Sensor/EMS ecu Connector
Replace the
connector or wiring
harness
Go to step 4
4
Are there any pins backed out from the Sensor/EMS ecu
Connector
Rectify/Replace
Connectors
Go to Step 5
5
Is Sensor Negative pin 238 SC to Ground
Go to Step 6
Repair the harness
as per the
schematic
6
Is Sensor Positive Pin 237, Short Circuited to GND
Repair the harness
as per the schematic Go to Step 7
7
Is Sensor physically Damaged
Check the
resistance between
two leads and it
should be between
4
– 10 Mega Ohms
. If
found faulty then
replace the Knock
Sensor
Go to Step 8
8
Fault Still Persists?
Replace Sensor and
then Fault still
persists then
Replace EMS ecu
Follow the steps
again for
reconfirmation
DTC’s confirmation:-
After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before
handing over to customer.
Recheck the fault, fault shall not reappear.