842 / 5157
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: 838 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.
P0694-12: Radiator Fan High Speed Relay Control Circuit High – Circuit Short to Battery
Overview:
ISO Code
P0694-12
Customer Symptom
Radiator Fan will not Run, Engine Heat up and seize
Fault Effects (On Vehicle)
Radiator Fan will not run, Engine Heat up and seize and engine components
might get damaged
Lamp Status (If Any)
CE lamp ON after 1 drive cycle
Fault Detection Condition
This fault gets logged if the Radiator fan control pin of EMS ECU is short
Circuited to Battery
Normal Operating Condition
Healthy Wiring Harness connections between Radiator Fan relay and EMS
ECU, Relay Fully Operational, Healthy Wiring Harness connections from
Relay to Main Relay supply and Ground.
Probable Trouble Area
Improper Wiring Harness Connections, faulty Relay, Faulty radiator fan
Healing Condition
Ignition key on and 1 drive cycles after fault rectification
Fault permanent Deletion
1. Clear DTC Command form Scan tool
2. Stack Over Flow.
3. 40 warm up cycles.
4.ECU flashing
5. ECU Power-Fail
Component Details:
Radiator fan is driven by EMS ECU via a relay, Radiator Fan will be ON, when the EMS ECU energizes the coil of fan
relay.
Preliminary Checks:
1) Loose/ Damaged Connections between Fan Relay and EMS ECU.
2) Loose/ Damaged Connections between Fan Relay and Battery supply and Main Relay Supply.
3) Check for back out of pins at ECU connector.
4) Check for damage of pins at ECU connector.
5) Check the continuity from Relay to the ECU pin and from battery / Main Relay Supply to Fan Relay.