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
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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