Geely Emgrand X7. Manual part — 189

2.12.7.21 DTC P0122 P0123

1. DTC

description:

DTC P0122 Electronic Throttle Position Sensor #1 Circuit Low Voltage

DTC P0123 Electronic Throttle Position Sensor 1 Circuit High Voltage or open

TPS1 sensor sends signal through ECT harness connector EN27 terminal B to ECM through ECM
harness connector EN01 terminal No.52. If the TPS1 sensor signal is lost, but ECM is able to
receive the normal TPS2 sensor signal, then ECM controls the engine to enter reliability of
determining the driver's intention decline or no high power output mode. Engine responds to the
pedal changes slowly and engine power output will be significantly weaker, although the vehicle
can still be able to drive in normal traffic.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The DTC
(Control Strategy)

Fault Locations

P0122

Hardware
Circuit
Malfunction

TPS signal end short to ground or
open, the input signal is less than
3.5%, DTC code set.

P0123

Hardware
Circuit
Malfunction

TPS signal end short to power supply,
input signal is greater than 96.5%,
DTC code set.

1. Electronic

Throttle Body

2. Electronic

Throttle Circuit

3. ECM

3. Circuit

sketch

NL02-2054b

A EN27

C EN27

D EN27

B EN27

E EN27

H EN27

M

74 EN01

27 EN01

52 EN01

21 EN01

20 EN01

V5RTN1

70 EN01

V5REF1

TPS2

TPS1

ETCA

ETCB

电子节气门

ECM

Electric

throttle

755

4. Diagnostic

Steps:

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.

Step 1

Inspect for DTC code P0641, P0651, P0222, P0223.

(a) Connect fault diagnosis tester to the vehicle diagnostic interface.

(b) Turn ignition switch to ON position.

(c) Press the fault diagnosis tester power button.

(d) Select the following menu items: Engine/Read DTC codes.

(e) Read DTC codes.

Results

DTC Codes Shown

Go to Step

Only for P0122、P0123 Yes

has P0222 , P0223 , P0641 , P0651

No

Step 2

Check EN27 Nub terminal .

(a) Rotated ignition switch to OFF

position.

(b)

Disconnect ETC harness
connector EN27.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between

EN27 terminal B and a reliable
ground.

(e) Measure voltage between EN27

terminal B and a reliable ground.

NL02-2055b

D

H

G

F

E

A

B

C

EN27 节气门位置传感器线束连接器

B

No

Refer to2. 12.7.46 DTC P0641 P0651

Yes

EN27 throttle position sensor harness connector

756

(f) Test continuity between EN27

terminal B and EN01 terminal
No.52.

NL02-2056b

EN01 发动机控制模块线束连接器

1

2

4

5

3

81

63

44

25

6

62

43

24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

26

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

45

46

61 60 59 58

57 56 55

54 53 52 51 50 49 48 47

64

65

66

80 79 78 77 76 75 74 73 72 71 70 69 68 67

52

Results

Test Items

Standard Value

EN27(B)-reliable grounding

10 kΩ or higher

EN27(B)-Reliable grounding voltage value

0V

EN27(B)-EN01(52)Continuity Less

than

1

Ω

Does it conform to the standard value?

Step 3

Inspect terminal B voltage output signal.

(a) Connect to ETC harness connector EN27.

(b) Connect ECM harness connector EN01.

(c) Measure ETC harness connector EN27 terminal B output voltage.

Standard Value: Refer to 2.12.7.12 Electronic Throttle Body (ETC) Inspection.

Is the output voltage value accorded with the standard value?

Step 4

Inspect ECM Power Supply Circuit and ground circuit.

(a) Refer to 2.12.7.43 DTC P0562 P0563 to inspect ECM Power Supply Circuit and ground

circuit.

No

Refer to Replacement of Electrical Throttle Body
Assembly to replace the Electrical Throttle Body (ETC).

Yes

No

Refer to2. 12.7.46 DTC P0641 P0651

Yes

EN01 engine control module harness connector

757

ECM power and ground circuits normal?

Step 5

Replace ECM

(a) Refer to 2.12.8.1 Replacement of Engine Control Module to Replace ECM.

(b) Carry out the crankshaft position sensor learning, refer to 2.12.7.11 “Crankshaft Position

Sensor (CKP) Learning.

Step 6

Use fault diagnosis tester to confirm if DTC is stored again .

(a) Connect the fault diagnosis tester to the diagnostic interface.

(b) Turn ignition switch to ON position.

(c) Clear DTC code.

(d) Start and run the engine at idle speed to warm up the engine for at least 5 min.

(e) Read control system DTC code again to confirm that the system has no DTC code exported.

Step 7

Troubleshooting

5. Maintenance

guide

:

Electronic throttle body (ETC) can only be replaced as an assembly. Do not disassemble it and
repair. Refer to 2.6.8.5 Replacement of Electrical Throttle Body Assembly for the replacement of
the ETC.

No

Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

Next

No

Repair power and ground circuits fault.

Yes

758