NEXON DIAGNOSTIC MANUAL

OSPREY- Application

DTC Troubleshooting Data

Version: 4.0

Date: 10-02-2017

Prepared by: Mithipati Prasad

Checked by: G S Raju / Senthilnathan S

Page: 328 of 654

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: Electrical Fan (Bottom Fan) Drive Fault - Short Circuit

Overview:

DTC Description as per ISO standard

Fan 2 Control Circuit High

ECU Pin Number

Customer Symptom

AC will not function.

Cooling fans will run in high speed continuously.

Engine over temperature warning lamp will turn on at lesser engine coolant

temperature (8 degrees less than normal condition).

Fault Effects (On Vehicle)

Cooling fans will run in high speed continuously.

SPCS injector learning will be disabled.

Threshold for Engine over temperature warning lamp turn ON will be

reduced.

Lamp Status (If Any)

CE lamp is on.

Fault Detection Condition

This DTC gets logged due to (Bottom) High speed fan control pin of EMS

ecu is short circuited to ground.

Normal Operating Condition

When vehicle is soaked for 8 hours and Engine is cranked keeping AC off

then Cooling fans will be in Off condition.

Probable Trouble Area

Fan high speed fan relay 1 / 2, ECU, Wiring harness of cooling fans circuit.

Component Details:

Cooling Fan circuit consists of two fans. With the help of Relays, cooling fans will be made to run either in Series (Low

Speed) or Parallel (High Speed). EMS will decide whether to turn the cooling fans in low speed or high speed based on

Engine coolant temperature & AC refrigerant pressure.

Preliminary Checks:

Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If

yes, go ahead with next ste

ps. If not, check for other DTC’s presence.

Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to

earlier issue closure.

Loose/ Damaged Connections between high speed fan Relay 1 / 2 and EMS ecu.

Loose/ Damaged Connections between High speed fan Relay 1 / 2 and Battery supply or Ground.

Check for back out of pins & damage of pins at ECU connector.