Geely Emgrand X7. Manual part — 47
Geely Emgrand X7. Manual part - 47
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.
187
2.2.7.22 DTC P0131 P0132 P0133 P0134
1. DTC
description:
DTC P0131
Front Oxygen Sensor Circuit Short to Low Voltage
DTC P0132
Front Oxygen Sensor Circuit Short to High Voltage
DTC P0133
Slow response of front oxygen sensor
DTC P0134
Front Oxygen sensor is open
After the vehicle started, ECM works in open-loop mode, in which ECM ignores the front oxygen
sensor signal voltage when calculating the Air-Fuel ratio. The control module provides
approximately 450mV reference voltage to the front oxygen sensor. When the engine starts
running, the front oxygen sensor will be heated and begin to generate a 0-0.1 V voltage. This
voltage fluctuates. Once ECM detects that the front oxygen sensor voltage exceeds a preset
threshold voltage, ECM immediately enters into the closed-loop mode. Control module determines
the Air-fuel ratio using the received front oxygen sensor voltage signal. If the front oxygen sensor
voltage increases to over the reference voltage (tend to 1 V), it indicates that the air fuel mixture is
too rich. If the front oxygen sensor's voltage decreased to below the reference voltage (tend to 0
mV), the mixture is too thin.
ECM provides a signal through ECM harness connector EM01 terminal No.10 to front oxygen
sensor harness connector EM04 terminal B and an internal low reference voltage through ECM
harness connector EM01 terminal No.2 to front oxygen sensor wiring harness connector EM04
terminal No. A.
2. Conditions For Setting DTC and The Fault Location:
DTC
Code
DTC Detection Strategy Conditions For Setting The
DTC (Control Strategy)
Fault Locations
P0131
1. Engine Running Longer
than 60s.
2. Water temperature is more
than 70 (158
℃
ºF)
3. Short circuit of front
oxygen sensor to
grounding.
4. Duration Longer Than 13s.
P0132
1. Front
Oxygen
Sensor Voltage Too
High
2. Pre-Catalytic
Oxygen Sensor
Voltage Too Low
1. Engine Running Longer
than 60s.
2. Water temperature is more
than 70 (158 ºF)
℃
。
3. Shortly connect front
oxygen sensor signal and
1. Sensor
Circuit
2. Sensor
3. ECM.
188
power supply.
4. Duration Longer Than 13s.
P0133
The time for the variation
of the oxygen sensor
against the oxygen
concentration in the
exhaust emissions
exceeds the upper limit.
The time for the variation
of the oxygen sensor
against the oxygen
concentration in the
exhaust emissions
exceeds the lower limit.
1. Engine Running Longer
than 60s.
2. Water temperature is more
than 70 (158 ºF)
℃
。
3. Engine speed range is
1,700-2,300 rpm.
4. Oxygen sensors to the
exhaust oxygen
concentration changes
responding time longer
than the system preset
threshold.
1. Sensor
Circuit
2. Sensor
3. ECM
4. Mixture is too
thick
5. Mixture Too
Lean
P0134
1. Signal Circuit Open.
2.Oxygen Sensors High-
Temperature and High
Resistance.
1. Engine Running Longer
than 60s.
2. Water temperature is more
than 70 (158 ºF)
℃
。
3. Duration Longer Than 80s.
1. Sensor
Circuit
2. Sensor
3. ECM
3. Circuit
sketch
EF22
主继电器ER09
87
30
86
85
ED01
44
EM01
EM01
23
EM01
48
D
C
B
A
D
C
B
A
发
动
机
控
制
模
块
蓄电池
EF40
前氧传感器
EM01
EM01
O2AHTR
O2AHI
V5RTN3
O2BHTR
O2BHI
47
73
24
后氧传感器
MPR
NL02-0039c
4. Diagnostic
Steps:
Step 1
Connect a fault diagnosis tester.
Next
Main relay ER09
Front oxygen sensor
Rear oxygen sensor
Battery
Engi
ne
co
ntr
ol mo
dul
e
189
Step 2
Start engine and turn on the fault diagnosis tester.
Step 3
Keep the engine speed at 2,500 rpm for more than 2 min to warm up the engine, until
the engine coolant temperature reaches 80°C (176 °F).
Step 4
Select on the fault diagnosis tester: Engine / Read Data Flow / Group 1 Oxygen
Sensor Voltage 1 (Front Oxygen Sensor).
Step 6
Test the oxygen sensor signal.
(a) If the voltage data is consistently lower than 0.45 V (mixture too thin), carry out the
following inspection steps:
•
Spray proper amount of propane gas into the intake.
•
Inspect whether the front oxygen sensor voltage data has a significant change, in which case
the signal voltage will increase rapidly.
(b) If the voltage data is consistently higher than 0.45V (mixture too thick), carry out the
following inspection steps:
•
Put the gear into neutral.
•
Apply hand brake.
•
Press the accelerator pedal so the engine speed suddenly increases to 4,000 rpm and then
quickly release the accelerator pedal.
•
Repeat the previous step more than 3 times.
•
Observe whether there is a significant change in the front oxygen sensor voltage data, as the
signal voltage will decrease rapidly.
During the above test, the oxygen sensor signal voltage should have a significant change.
Is voltage changed significantly?
Step 6
Inspect there are no other control system DTC codes output.
Step 5
Observe the pre-catalytic oxygen sensor output voltage. The data stream should
fluctuate within 0.1-0.8 V.
Yes
Inspect the cause for engine air-fuel ratio too lean/too rich.
Refer to 2.12.7.4 Fault Symptom Table.
No
Yes
Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.
No
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190
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