Geely EC718, EC718RV, EC715, EC715RV. Manual part — 191
Geely EC718, EC718RV, EC715, EC715RV. Manual part - 191
FE02-5353b
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A
B
C
D
Pre-catalytic Oxygen Sensor Harness
Connector EO02
ECM Harness Connector EO01
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect oxygen sensor wiring harness connector EO02.
(c)
Disconnect ECM harness connector EO01.
(d)
Test Continuity between pre-catalytic oxygen sensor wiring
harness connector EO02 terminal C and ECM harness
connector EO01 terminal No.14.
Standard Resistance: Less than 1 Ω
(e)
Connect ECM harness connector EO01.
(f)
Connect pre-catalytic oxygen sensor wiring harness
connector EO02.
Is the resistance specified value?
No
ECM control circuit malfunction
Yes
Step 5
Check ECM working 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 6
Replace ECM. Refer to
Engine Control Module Replacement
.
(a)
Replace ECM.
(b)
Carry out crankshaft position sensor self learn. Refer to
Crankshaft Position Sensor (CKP) Learn
Next
Step 7
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 5 min.
(f)
Read control system DTC code again to confirm that the
system has no DTC code.
Engine
Control System JL4G15-D
2-679
No
Intermittent Fault. Refer to
Yes
Step 8
Diagnostic completed.
5. Repair Instructions:
Replace the pre-catalytic oxygen sensor. Refer to
Pre-Catalytic Oxygen Sensor Replacement
.
2.12.7.24 DTC P0137 P0138 P0140
1. DTC Descriptor:
DTC
P0137
Post-Catalytic Oxygen Sensor Circuit Short To Low Voltage
DTC
P0138
Post-Catalytic Oxygen Sensor Circuit Short To High Voltage
DTC
P0140
Post-Catalytic Oxygen Sensor Circuit Open
After the vehicle started, ECM works in open-loop mode, in which ECM ignores the Pre-Catalytic oxygen sensor signal voltage when
calculating the Air-Fuel ratio. ECM provides an approximate 450 mV reference voltage to the Pre-Catalytic oxygen sensor. When
the engine is running, Pre-Catalytic oxygen sensors start heating and begin to generate a 0-0.1 V voltage, which fluctuates. Once
ECM detects that the Pre-Catalytic oxygen sensor voltage exceeds a preset threshold voltage, ECM immediately enters into the
closed-loop mode. ECM uses Pre-Catalytic oxygen sensor signal voltage to determine the Air-Fuel ratio. If the Pre-Catalytic oxygen
sensor voltage is increased to above the reference voltage (tend to 1 V), the mixture is too rich. If the Pre-Catalytic oxygen sensor
the voltage decreased to below the reference voltage (tend to 0 mV), the mixture is too lean.
•
ECM provides a signal through ECM harness connector EO01 terminal No.30 to Post-Catalytic oxygen sensor wiring harness
connector EO03 terminal B.
•
ECM provides an internal low reference voltage through ECM harness connector EO01 terminal No.55 to Pre-Catalytic oxygen
sensor wiring harness connector EO03 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
P0137
Short to Ground When Cold
1. Engine running longer than 60 s.
2. Coolant temperature is less than 70 °C (158 ºF).
3. Post-Catalytic oxygen sensor signal 0.
4. Duration longer than 25 s.
1. Sensor circuit
2. Sensor
3. ECM
P0138
Post-Catalytic oxygen
sensor voltage signal too
high
1. Engine running longer than 60 s.
2. Coolant temperature is less than 70 °C (158 ºF).
3. Post-Catalytic oxygen sensor signal around 3,200
mV.
4. Duration longer than 25 s.
2-680
Control System JL4G15-D
Engine
DTC Code DTC Detection Strategy Conditions For Setting The DTC (Control Strategy)
Fault Locations
P0140
1. Oxygen sensor signal
circuit open
2. Oxygen sensor high-
temperature and high
resistance
1. Engine running longer than 60 s.
2. Coolant temperature is less than 70 °C (158 ºF).
3. Post-Catalytic oxygen sensor signal exceeds a
reasonable range.
4. Duration longer than 25 s.
3. Schematic
12
D
C
A
B
Main Relay
From Battery
Post-catalytic Oxygen Sensor
Engine
Control
Module
FE02-5206b
4. Diagnostic Steps:
Step 1
Connect scan tool.
Next
Step 2
Start engine and turn on the scan tool.
Next
Step 3
Select on the scan tool: Engine / read data flow / group 1 oxygen sensor voltage 2(Post-Catalytic oxygen
sensors).
Engine
Control System JL4G15-D
2-681
Next
Step 4
Observe oxygen sensor output voltage, which should be within 0.6-0.7 V.
Yes
Intermittent Fault. Refer to
No
Step 5
Carry out the oxygen sensor signal test.
(a)
If the data is consistently below 0.45 V (mixture too lean),
carry out the following steps:
•
Spray proper amount propane gas into intake.
•
Observe whether the Post-Catalytic oxygen sensor
voltage has a significant change, as the signal voltage will
increase rapidly.
(b)
If the data is consistently higher than 0.45 V (mixture too rich),
carry out the following steps:
•
Put the gear into neutral.
•
Apply hand brake.
•
Press the acceleration pedal so the engine speed
suddenly increases to 4,000 rpm and then quickly release
the acceleration pedal.
•
Repeat the previous step more than 3 times.
•
Observe whether the Post-Catalytic oxygen sensor
voltage has a significant change, as the signal voltage will
decrease rapidly.
During the above test, the oxygen sensor signal voltage should
have a significant change.
Does the voltage have a significant change?
Yes
Check the cause for Air-Fuel ratio too thin /
too rich. Refer to
No
Step 6
Confirm no other control system DTC code.
(a)
Connect scan tool to the datalink connector.
(b)
Turn the ignition switch to "ON" position.
(c)
Press the scan tool power button.
(d)
Select the following menu items: Engine/Read DTC codes.
(e)
Read DTC codes.
Results:
DTC Codes Shown
To Step
DTC codes other than P0137, P0138, P0140
No
P0137, P0138, P0140
Yes
2-682
Control System JL4G15-D
Engine
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