Scribd
Upload
149 views2 pages

Component Location: C1704 EPS Module (Fail Safe Relay Stuck) Malfunction General Information

The document details the C1704 EPS Module malfunction related to a fail-safe relay being stuck, affecting the electric power steering (EPS) system. It outlines the diagnostic trouble code (DTC) detection conditions, inspection procedures, and verification steps necessary to confirm the repair. The EPS control module measures torque and controls motor current, and a stuck relay can lead to continuous power supply issues even when the ignition is off.

Uploaded by

reza mohamadtabar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
149 views2 pages

Component Location: C1704 EPS Module (Fail Safe Relay Stuck) Malfunction General Information

The document details the C1704 EPS Module malfunction related to a fail-safe relay being stuck, affecting the electric power steering (EPS) system. It outlines the diagnostic trouble code (DTC) detection conditions, inspection procedures, and verification steps necessary to confirm the repair. The EPS control module measures torque and controls motor current, and a stuck relay can lead to continuous power supply issues even when the ignition is off.

Uploaded by

reza mohamadtabar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

PICANTO(SA) > 2010 > D 1.

1 TCI-U > Steering > MDPS > C1704 EPS Module(fail safe
relay stuck)Malfunction

C1704 EPS Module(fail safe relay stuck)Malfunction > General Information


Component Location

General Description

EPS CM measures operating torque using torque sensor when driver operates steering wheel. The EPS CM controls the current of
EPS motor in proportion to vehicle speed and operating torque of steering wheel. EPS CM, at times, supplies or cuts off current (as
determined by engine control relay fail safe relay inside EPS CM) to EPS motor operating source and system source.

DTC Description
This DTC code is about failure of fail safe relay. While monitoring relay contact voltage, if motor source is supplied continuously,
even with IG key OFF, EPS CM regards this as stuck relay inside EPS CM and then sets this code.

DTC Detecting Condition


Item Detecting Condition Possible cause
DTC strategy ● Voltage check
● Fail-safe relay "OFF"( just once at IG"ON")
Enable conditions
● Voltage between motor terminal < 5V
Threshold value ● Fail-safe relay contact voltage ≥ 5.5 V
● Sticky fail-safe relay contact part
Diagnosis time ● 5 sec
● Motor : OFF
● Relay : OFF
fail safe
● Fail lamp : ON
● Restoration condition : Power "OFF"
C1704 EPS Module(fail safe relay stuck)Malfunction > Inspection/Repair > Component Inspection
Component Inspection
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Clear DTC.
3. Drive the vehicle within DTC Enable conditions in General information.

4. Are any DTCs present ?

▶ Check EPS CM for damage or sticking by the naked eye. Substitute with a known-good EPS CM and check for proper
operation.
If the problem is corrected, replace EPS CM and then go to "Verification of vehicle Repair" procedure.

▶ Substitute with a known-good EPS CM and check for proper operation.


If the problem is corrected, replace EPS CM and then go to "Verification of Vehicle Repair" procedure.

C1704 EPS Module(fail safe relay stuck)Malfunction > Verification of Vehicle Repair
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present ?

▶ Go to the applicable troubleshooting procedure.

▶ System performing to specification at this time.

You might also like