Geely Emgrand X7. Manual part — 328

3.5.7.14 P0721 P0722

1. DTC

description:

DTC P0721 Output shaft speed sensor value

DTC P0722 Output shaft speed sensor signal is instability

The ISS sensor is a Hall Effect sensor. The ISS sensor is integrated with the OSS sensor and installed on the main
housing of the automatic transmission (below the valve body).

2. Conditions for setting DTC and the gault position :

DTC code

DTC detection strategy

Conditions for setting the DTC (control

strategy)

Fault position s

P0721

Compared the output
shaft speed (OSS) sensor
with the external
equivalent revolution
speed signal, verify the
integrity thereof.

P0722

The output speed sensor
receives the intermittent
pulse or interference
pulse.

Ignition switch is in ON position

1. Electromagnetic

valve and harness
assembly

2. TCU

3.

Automatictrans
mission assembly

3. Circuit

sketch

1311

T

C

U

电磁阀

换挡器

档位开关

LEVER

REVERSE

START

VBS5

VBS6

VBS7

V

BS8

VBS9

VBS1

0

O

n

O

ff

1

O

n

O

ff

2

O

n

O

ff

3

O

n

O

ff

4

EMM

INPUT

SHAFT

SPEE

D

SENSOR

OU

TPUT

SHAFT

t

SPE

ED

SENSOR

25

26

10

11

9

8

13

12

24

23

22

21

20

7

6

5

4

3

2

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

1

18

8

1

3

2

12

14

4

11

12

9

10

15

2

1

4

3

6

5

7

7

J-5

5

16

17

J-5

4

J-5

1

J-5

6

J-5

2

J-5

3

4

11

10

10

15

3

CAN H

启动继电器

倒车信号

输出

主继电器

JF-1

IG2

JB-2

CAN L

10

20

J-3

J-1

J-3

J-2

J-2

J-3

J-3

J-3

J-1

8

J-3

J-3

J-3

J-3

J-3

J-3

J-3

J-3

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

IF36

NL03-2005c

4. Diagnostic

procedures:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and analyze the
accuracy of the data, as these will help with quick diagnosis.

1

Read the fault code again after clearing away the fault code to check if fault codes, except DTC
P1605, P1610 and P1611 exist in the control system.

A. Connect fault diagnosis tester to the datalink connector.

B. Rotated ignition switch to ON position

C. Switch on fault diagnostic device power supply

D. Clear DTC code.

E. Reset reading fault code, and check if DTCs meet setting condition of fault code in current

DTC Codes Shown

To Step

DTC P0721 P0722

Yes

DTC except for DTC P0721 P0722

No

Gears switch

Main relay

JF-1

Reverse output

signal

Start relay JB-2

Shifter

Electromagnetic

valve

1312

2

Detect Output shaft speed sensor reference voltage

A. Turn the ignition switch to the OFF position.

B. Disconnect the harness connector J-4 of the

electromagnetic valve.

C. Turn the ignition switch to the ON position.

D. Measure the voltage between Terminals 8 and 9

of the electromagnetic valve harness connector
J-4.

Standard voltage values: is more than10V

Does it conform to the standard value?

电磁阀线束连接器 J-4

1

8

20

14

9

15

10

16

11

17

12

18

13

19

2

21

3

22

4

23

5

24

6

25

7

26

SL03-0036c

3

Detect output shaft speed sensor signal voltage

A. Turn the ignition switch to the OFF position.

B. Disconnect the harness connector J-4 of the electromagnetic valve.

C. Turn the ignition switch to the ON position.

D. Measure the voltage between terminals 8 and 10 of the electromagnetic valve harness connector J-4.

Standard voltage: 4.9-5.1 V

Does it conform to the standard value?

4

Detect output shaft speed sensor circuit

No

Yes

Refer to3.4.7.6 fault diagnosis code (DTC) chapter
index

No

Yes

Refer to 3.4.7.8 Replacement of automatic
transmission control module to replace TCU.

No

Yes

Refer to 3.4.7.8 replacement of automatic
transmission control module to replace TCU.

Electromagnetic valve harness connectorJ-4

1313

A. rotated ignition switch to OFF position.

B. Disconnect the harness connector J-4 of the

electromagnetic valve.

C. Measure the resistance between Terminal No.8of

the electromagnetic valve harness connector J-4
and Terminal No.12 of the automatic control
module J-3.

D. Measure the resistance between Terminal 9 of the

electromagnetic valve harness connector J-4 and
terminal No.2 of the automatic control module
J-3.

E. Measure resistance of electromagnetic valve

harness connector J-4 No ,10 terminal and
automatic transmission control moduleJ-3No.1
terminal

自动变速器控制模块线束连接器 J-3

1

11

2

12

3

13

4

14

5

15

6

16

7

17

8

18

9

19

10

20

SL03-0036c

F. Turn the ignition switch to ON position.

G. Measure the voltage between Terminal No.8of the electromagnetic valve harness connector J-4 and secure

ground wire.

H Measure voltage of electromagnetic valve harness connector J-4 Terminal No.9 and reliable grounding

Measure Voltage of electromagnetic valve harness connector J-4 No.10 terminal and reliable grounding

Results

Test Items

Standard Value

J-4(8) — J-3(12)

Less than 3 Ω

J-4(9) — J-3(2)

Less than 3 Ω

J-4(10)— J-3(1)

Less than 3 Ω

J-4(8) — Reliable grounding voltage value

O V

J-4(9) — Reliable grounding voltage value

0 V

J-4(10) — Reliable grounding voltage value

O V

Does it conform to the standard value?

5

Detect the output waveform of the output shaft speed sensor.

No

Yes

Circuit malfunction, repair circuit.

Auto-transmissioncontrol module harness connectorJ-3

1314