Geely EC718, EC718RV, EC715, EC715RV. Manual part — 50
Geely EC718, EC718RV, EC715, EC715RV. Manual part - 50
FE02-5046 b
1
2
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Pre-catalytic Oxygen Sensor
Harness Connector EN02
ECM Harness Connector EN01
1
3
5
7
8
6
4
2
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(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect oxygen sensor wiring harness connector EN02.
(c)
Disconnect ECM harness connector EN01.
(d)
Measure resistance between the oxygen sensor wiring
harness connector EN02 terminal No.3 and ECM harness
connector terminal No.39. Check whether the circuit is open.
If there is no open circuit, repair the faulty part.
(e)
Measure resistance between pre-catalytic oxygen sensor
wiring harness connector EN02 terminal No.3 and a reliable
ground. Check whether the circuit is short to ground. If there
is no short circuit, repair the faulty part.
(f)
Measure voltage between pre-catalytic oxygen sensor wiring
harness connector EN02 terminal No.3 and a reliable ground.
Check whether the circuit is short to power supply. If there is
no short circuit, repair the faulty part.
Test Items
Standard Value
Resistance Between EN02 (3) and EN01 (39)
Less than 1 Ω
Resistance Between EN02 (3) and a Reliable
Ground
10 kΩ or higher
Voltage Between EN02 (3) and a Reliable
Ground
0 V
Execute next step as per normal.
Next
Step 13
Check ECM power supply circuit.
(a)
Check whether ECM power supply circuit is normal.
(b)
Check whether ECM ground circuit is normal.
No
Repair the faulty part.
Yes
Step 14
Replace ECM.
Next
Step 15
Use scan tool to confirm whether the DTC code is stored again.
(a)
Connect scan tool to the datalink connector.
(b)
Turn the 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)
Road test the vehicle for at least 10 min.
(f)
Read control system DTC code again to confirm that the
system has no DTC code.
Engine
Control System JL4G18-D
2-115
No
Intermittent Fault. Refer to
Yes
Step 16
Diagnostic completed.
5. Repair Instructions:
Replace the pre-catalytic oxygen sensor. Refer to
Pre-Catalytic Oxygen Sensor Replacement
.
2.2.7.22 DTC P0136 P0137 P0138 P0140 P2270 P2271
1. DTC Descriptor:
DTC
P0136
Post-Catalytic Oxygen Sensor Unreasonable
DTC
P0137
Post-Catalytic Oxygen Sensor Circuit Voltage Too Low
DTC
P0138
Post-Catalytic Oxygen Sensor Circuit Voltage Too High
DTC
P0140
Post-Catalytic Oxygen Sensor Circuit Malfunction
DTC
P2270
Post-Catalytic Oxygen Sensor Aging (Tool Lean)
DTC
P2271
Post-Catalytic Oxygen Sensor Aging (Too Rich)
After the vehicle is started, the control module works in the open-loop mode and ignores heated oxygen sensor signal voltage when
calculating air-fuel ratio. The control module provides approximately 450mV reference voltage to the heated oxygen sensor. When
the engine starts running, the heated oxygen sensor will be heated and begin to generate a 0-0.1V voltage. This voltage fluctuates.
Once the control module detects that the heated oxygen sensor voltage exceeds a threshold voltage, it will immediately enter into
the closed-loop mode. Control module determines the air-fuel ratio using the received heated oxygen sensor voltage signal. If the
heated oxygen sensor voltage increases to over the reference voltage (tend to 1V), it indicates that the air fuel mixture is too rich.
If the heated oxygen sensor voltage decreases to below the reference voltage (tend to 0mV), it indicates that the air fuel mixture is
too lean.
•
ECM provides a signal through ECM harness connector EN01 terminal No.29 to post-catalytic oxygen sensor wiring harness
connector EN03 terminal No.4.
•
ECM provides a low reference voltage through ECM harness connector EN01 terminal No.39 to pre-catalytic oxygen sensor
wiring harness connector EN03 terminal No.3.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0136
P0137
Short to Ground When Cold
1. Post-Catalytic oxygen sensor
voltage is less than 0.06 V.
2. Post-Catalytic oxygen sensor
reaches the normal working
temperature.
1. Sensor Circuit
2. Sensor
3. Mixture Too Rich
4. Mixture Too Lean
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Control System JL4G18-D
Engine
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0138
5. Three-way Catalytic
Converter
6. ECM
Post-Catalytic Oxygen Sensor
Voltage Too High
1. Post-Catalytic oxygen voltage
signal is greater than 1.5 V.
2. Battery voltage is greater than
10.98 V.
3. Engine speed is greater than 25
rpm.
4. Target excess air coefficient is
equal to 1.
5. Three-way catalytic converter
temperature is higher than 320°C
(608 ºF).
6. Battery voltage is greater than
10.98 V.
7. Post-Catalytic oxygen sensor
reaches the normal working
temperature.
P0140
1. Oxygen Sensor Signal Circuit
Open
2. Oxygen Sensor With High
Resistance at High Temperature
1. Post-Catalytic oxygen sensor
voltage is between 0.42 V and 0.5
V.
2. Post-Catalytic oxygen sensor
resistance is greater than 40,000
Ω.
3. Post-Catalytic oxygen sensor
reaches the normal working
temperature.
1. Sensor Circuit
2. Sensor
3. Mixture Too Rich
4. Mixture Too Lean
5. Three-way Catalytic
Converter
6. ECM
P2270
P2271
1. Post-Catalytic oxygen sensor
voltage is continuously low.
2. Post-Catalytic oxygen sensor
voltage is continuously high.
1. Post-Catalytic oxygen sensor
voltage is less than 0.6 V.
2. Post-Catalytic oxygen sensor
voltage is greater than 0.6 V.
3. Post-Catalytic oxygen sensor
reaches the normal working
temperature.
Engine
Control System JL4G18-D
2-117
3. Schematic
12
14
Main Relay
From Battery
Engine
Control
Module
From Pre-catalytic Oxygen Sensor
Post-catalytic Oxygen Sensor
FE02-5012b
4. Diagnostic Steps:
Step 1
Connect scan tool.
Next
Step 2
Start engine and turn on the scan tool.
Next
Step 3
Maintain 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 ºF).
Next
Step 4
Select on scan tool: Engine/Read data flow/Group 1 Oxygen sensor voltage 2 (Post-Catalytic oxygen
sensors).
Next
Step 5
Observe oxygen sensor output voltage, the data should be within 0.6-0.7V unchanged.
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Control System JL4G18-D
Engine
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