Geely EC718 2009 Workshop Manual page 161

Engine
Next
Diagnostic completed.
Step 6
2.2.7.15 DTC P0030 P0031 P0032 P0053
1. DTC Descriptor:
DTC
DTC
DTC
The Pre-Catalytic heated oxygen sensor (HO
with the oxygen content in exhaust flow. Each heated oxygen sensor has an internal heating element for sensor heating. ECM
controls the heated oxygen sensor heating control circuit. This makes the system enter into the closed-loop control mode earlier,
so that ECM can calculate Air-Fuel ratio earlier. ECM commands heater control module switched on or off, so that heated oxygen
sensor works within the specified working temperature range. Engine control module detects the temperature by Measure the heater
current.
The Pre-Catalytic heated oxygen sensor heating coil voltage is provided by The Main Relay, which is controlled by ECM. When the
ignition switch is turned to "ON" position, harness connector EN02 terminal No.1 voltage is provided by the battery. ECM controls
heater working time through ECM harness connector EN01 terminal No.6.
2. Conditions For Setting DTC and The Fault Location:
DTC Code DTC Detection Strategy
P0030
P0031 Hardware Circuit Checks
P0032
Resistance is greater than the
P0053
set value.
P0030 Pre-Catalytic oxygen sensor heating control circuit open
P0031 Pre-Catalytic oxygen sensor heating control circuit short to ground
P0032 Pre-Catalytic oxygen sensor heating control circuit short to power supply
S) is used for fuel control. The sensor compares the oxygen content in ambient air
2
Conditions For Setting The DTC (Control
1. Circuit Open.
2. Circuit Short to Ground.
3. Circuit Short to Power Supply.
1. The current Pre-Catalytic oxygen sensor
internal resistance is greater than 1500 Ω.
2. The current exhaust gas temperature is
between 200°C (392 ºF) and 550°C
(1,022 ºF).
Control System JL4G18-D
(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.
Strategy)
EC718/EC718RV EC715/EC715RV 10/2009
2-79
Fault Locations
1. Sensor Circuit
2. Sensor
3. ECM