Geely EC718, EC718RV, EC715, EC715RV. Manual part — 52
Geely EC718, EC718RV, EC715, EC715RV. Manual part - 52
(f)
Read control system DTC code again to confirm that the
system has no DTC code.
No
Intermittent Fault. Refer to
Yes
Step 17
Diagnostic completed.
5. Repair Instructions:
Replace post-catalytic oxygen sensor. Refer to
Post-Catalytic Oxygen Sensor Replacement
2.2.7.23 DTC P0170 P0171 P0172 P2177 P2178 P2187 P2188
1. DTC Descriptor:
DTC
P0170
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Unreasonable
DTC
P0171
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Too Lean
DTC
P0172
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Too Rich
DTC
P2177
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Higher Than Maximum
DTC
P2178
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Lower Than Minimum
DTC
P2187
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Higher Than Maximum
(Low-Load Zone)
DTC
P2188
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Lower Than Minimum
(Low-Load Zone)
Engine Control Module (ECM) controls the close-loop Air-Fuel ratio Measure system that achieves optimal combination of
performance, fuel economy and emissions control. In the close-loop mode, the engine control module monitors heated oxygen
sensor (HO
2
S) signal voltage and adjusts fuel supply according to the signal. Changes in fuel supply will change the value of long-
term and short-term fuel supply adjustment. Short-term fuel supply adjustment will respond to heated oxygen sensor signal voltage
and rapidly change. These changes will fine tune the fuel supply. Long-term fuel supply adjustment will respond to the trend in short-
term fuel supply adjustment. Long-term fuel adjustment adjusts the fuel supply in order to return to the center of the short-term fuel
adjustment value and controls the short-term fuel adjustment. The ideal fuel adjustment value is around 0%. A positive value indicates
that engine control module is increasing fuel supply to compensate the lean Air-Fuel mixture. A negative value indicates that engine
control module is decreasing fuel supply to compensate the rich Air-Fuel mixture.
Engine
Control System JL4G18-D
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2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0170
P0171
P0172
P2177
P2178
P2187
P2188
1. Fuel Adjustment Value Higher
Than Maximum Limit
2. Fuel Adjustment Value Lower
Than Minimum Limit
3. Fuel Adjustment Value Higher
Than Maximum Limit (Low-Load
Zone)
4. Fuel Adjustment Value Lower
Than Minimum Limit (Low-Load
Zone)
1. Excessive air coefficient is higher
than the standard value 1.23.
2. Excessive air coefficient is higher
than the standard value 0.77.
3. With engine speed at 1,640-3,200
rpm, throttle opens 20% -60%.
4. With engine speed at 1,640-3,200
rpm, throttle opens 20% -60%.
1. Fuel Injectors
2. Canister
3. MAP
4. TPS
5. Pre-Catalytic Oxygen
Sensor
3. Schematic:
.
4. Diagnostic Steps:
Note
Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.
Step 1
Check there are no other control system DTC codes.
(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.
Are there DTC codes other than P0170, P0171, P0172, P2177,
P2178, P2187, P2188?
Yes
No
Step 2
Read the intake manifold absolute pressure sensor data.
(a)
Turn the ignition switch to "OFF" position and connect scan
tool.
(b)
Start the vehicle.
(c)
Read the intake manifold absolute pressure sensor data.
(d)
Read the scan tool for atmospheric pressure value, and
compare it with table
.
Is scan tool atmospheric pressure reading normal?
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Control System JL4G18-D
Engine
No
Yes
Step 3
Read the throttle position sensor data.
(a)
Start the vehicle.
(b)
Warm up the engine with normal idle speed and throttle
opening is less than 10%.
(c)
Use scan tool to read throttle position sensor data.
Is throttle position sensor data normal?
No
Yes
Step 4
Read the pre-catalytic oxygen sensor data.
(a)
Start the vehicle.
(b)
Warm up the engine with normal idle speed.
(c)
Read the pre-catalytic oxygen sensor data.
Pre-Catalytic oxygen sensor standard value: 0.2-0.8 V
Is pre-catalytic oxygen sensor data is normal?
No
Yes
Step 5
Observe the long-term fuel adjustment parameter.
(a)
Start the vehicle.
(b)
Warm up the engine.
(c)
Observe the long-term fuel adjustment parameter.
Is the long-term fuel adjustment parameter normal?
Yes
System normal.
No
Step 6
Check engine and its components.
(a)
Turn the ignition switch to "OFF" position.
(b)
Check the vacuum hose crack, kink or connections.
(c)
Check the intake manifold, throttle body and fuel injector
vacuum leakage.
(d)
Check the crankshaft ventilation system leakage.
(e)
Check fuel contamination.
(f)
Check the fuel system working at air-fuel ratio too lean.
(g)
Check injector nozzle spray fuel too lean.
(h)
Check the fuel system working at air-fuel ratio too rich.
(i)
Check injector spray fuel too rich.
(j)
Check intake manifold collapse or obstruction.
Engine
Control System JL4G18-D
2-125
(k)
Check whether there is excessive fuel in the crankcase.
(l)
Check evaporative emission control systems working
condition.
(m) Check other fault lights in I/P working condition.
Is engine System normal?
Yes
System normal
No
Step 7
Repair engine and its components.
Next
Step 8
System normal.
5. Repair Instructions:
Replace fuel injectors. Refer to
.
Replace Canister solenoid valve. Refer to
Canister Solenoid Valve Replacement
2.2.7.24 DTC P0201 P0261 P0262
1. DTC Descriptor:
DTC
P0201
Cylinder No.1 Fuel Injection Control Circuit Open
DTC
P0261
Cylinder No.1 Fuel Injector Control Circuit Short to Ground
DTC
P0262
Cylinder No.1 Fuel Injector Control Circuit Short to Power Supply
Fuel injector operating voltage is provided by The Main Relay which is controlled by ECM. Battery voltage passes through the main
relay terminal No.3 to all fuel injector wiring harness connectors terminal No.1. ECM controls fuel injector ground circuit by ECM
harness connector EN01 terminal No.50. ECM monitors all fuel injector driver circuit status, if ECM detects driving circuit
corresponding voltage is incorrect, ECM will set up a fuel injector control circuit fault DTC code.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0201
P0261
P0262
Hardware Circuit Checks
1. Circuit Open.
2. Circuit Short to Ground.
3. Circuit Short to Power Supply.
1. Sensor Circuit
2. Sensor
3. ECM
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Control System JL4G18-D
Engine
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