Changan CS35 User Manual

3.1.13-152
CS35 2013.04
3.1.13-152Electronic Control System - ME7
DTC P0136, P0137, P0138, P0140, P2270, P2271
1. DTC Description
Fault Code Description Definition
P0136
Downstream oxygen sensor sig-
nal unreasonable
After vehicle starts, the electronic control module
works under open loop mode, which is to ignore the
post - catalytic oxygen sensor signal voltage in the
calculation of air -f uel ratio. ECM provides approxi-
mately 450 mV reference voltage for post - catalytic
oxygen sensor. When the engine is running, the post
- catalytic oxygen sensor start heating and start gen-
erating 0.1 ~ 0.9 V voltage. The voltage goes along
the reference voltage fluctuations. Once the control
module finds the post - catalytic oxygen sensor volt-
age exceeds the set threshold, then it will immedi-
ately goes into closed loop mode. ECM determines
the air - fuel ratio based on the post - catalytic
oxygen sensor voltage. If the post - catalytic oxygen
sensor voltage is greater than 0.45 V, indicating that
the mixture is too thick. If the post - catalytic oxygen
sensor voltage is below 0.45 V, it means the mixture
is too thin.
ECM makes the terminal 2 of the post - catalytic
oxygen sensor E08 at low - potential through termi-
nal 25 of E01 ,when post - catalytic oxygen sensor
gets to normal operating temperature, it transmit
oxygen sensor signal to the ECM through terminal 1
of E08 that connect to terminal 55 of E01 on the
ECM.
P0137
Downstream oxygen sensor sig-
nal voltage low
P0138
Downstream oxygen sensor sig-
nal circuit voltage too high
P0140
Downstream oxygen sensor cir-
cuit signal fault
P2270
Downstream oxygen sensor
aging
P2271
Downstream oxygen sensor
aging
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Changan CS35 Specifications

General

Brand	Changan
Model	CS35
Category	Automobile
Language	English