Hyundai Santa Fe (2006 year). Manual - part 645

FLA -646

FUEL SYSTEM

SIGNAL WAVEFROM AND DATA

EFD86111

Fig.1

Fig.1) CAN communication waveform

 Monitoring CAN HIGH and LOW simultaneously is important in monitoring CAN communication waveform. 
When CAN HIGH signal rise to 3.5V and LOW signal drops to 1.5V - voltage difference between HIGH and LOW signal is 
2V - at BUS IDLE state(DIGITAL "1") whose reference voltage is 2.5V, "0" is recognized. Besides, comparing HIGH and 
LOW signal if opposite waveform is detected with the reference voltage of 2.5V, Check if current cam signal transfers 
correctly.
 Continuous "0"signal above 6BIT means the occurence of error in CAN communication. 1BIT is easily distinguished as 
calculating the time when "SOF"(START OF FRAME) which notifies the start of frame occurs. 
Check if "0"signal above 6BIT is detected continuously when monitoring CAN communication waveform.

CAN HIGH signal

CAN LOW signal

SOF Bit

Digital "0"

Digital "1"

BUS IDLE

LGLG397A

MONITOR DTC STATUS

E9EAD6E3

1.

Check DTC Status

1)

Connect scantool to Data Link Connector(DLC).

2)

IG "ON".

3)

Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC’s information from the
DTCs menu

4)

Read "DTC Status" parameter.

DTC TROUBLESHOOTING PROCEDURES

FLA -647

SCMF16159L

5)

Is parameter displayed "Present fault"?

YES

▶ Go to "Terminal and connector inspection" procedure.

NO

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM
memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, con-
tamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair"
procedure

TERMINAL AND CONNECTOR INSPECTION

E0934A34

1.

Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by
interference from other electrical systems, and mechanical or chemical damage.

2.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or
damage.

3.

Has a problem been found?

YES

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

NO

▶ Go to "Signal Circuit Inspection" procedure.

SIGNAL CIRCUIT INSPECTION

E385D809

1.

Check CAN BUS resistance in Data Link Connector

1)

Ignition "OFF"

2)

Measure the resistance between terminals 3 and 11 of data link connector (Test 1)

3)

Disconnect PCM connector.

FLA -648

FUEL SYSTEM

4)

Measure the resistance between terminals 3 and 11 of data link connector (Test 2)

Specification : PCM and ABS(or ESP) connected : 60 ± 3Ω (Test 1)
PCM and ABS(or ESP) disconnected : 120 ± 3Ω (Test 2)

 M10

3. CAN High
11. CAN Low

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

SCMF16428L

5)

Is CAN BUS resistance within the specification?

YES

▶ Go to "2.Check short to ground in CAN BUS" as follows.

NO

▶ Below 10Ω for both conditions(disconnected, connected) : Repair short between CAN BUS lines and go to
"Verification of Vehicle Repair".
▶ 120Ω for both conditions(disconnected, connected) : Go to "4. Check CAN BUS continuity".
▶ Infinite Ω for both conditions(disconnected, connected) :Repair open in CAN communication circuit between
DLC terminal and In-pannel junction box.

2.

Check short to ground in CAN BUS

1)

Ignition "OFF"

2)

Disconnect PCM and ABS(or ESP) connector.

3)

Check continuity between DLC terminal 3 and chassis ground. (CAN HIGH line)

4)

Check continuity between DLC terminal 11 and chassis ground. (CAN LOW line)

Specification : Discontinuity ( Infinite Ω )

DTC TROUBLESHOOTING PROCEDURES

FLA -649

 M10

3. CAN High
11. CAN Low

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

 M10

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

SCMF16429L

5)

Is measured resistance within the specification?

YES

▶ Go to "3. Check short to battery in CAN BUS".

NO

▶ Repair short to ground in circuit and go to "Verification of Vehicle Repair".

3.

Check short to battery in CAN BUS

1)

Ignition "OFF"

2)

Disconnect PCM and ABS(or ESP) connector.

3)

Ignition "ON"

4)

Measure the voltage of DLC terminal 3. (CAN HIGH line)

5)

Measure the voltage of DLC terminal 11. (CAN LOW line)

Specification : 0.0V~0.1V

 M10

3. CAN High
11. CAN Low

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

 M10

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

V

V

SCMF16430L

6)

Is measured resistance within the specification with both connector disconnected?

YES

▶ Go to"4. Check CAN BUS continuity" as follows.