Chery A15. Manual — part 255

CTS

5 V

GND

A/D

M

EC

2. Component parameters
Working voltage: 5V DC
Working temperature: -40 ～ 135

°C

Circuit diagram:
At 20 ～ 30

°C, the resistance is 3560 ～ 2260 Ω

At 90～ 100

°C, the resistance is 120～180Ω

3. Fault diagnosis
Tips: All the following judgments are based on
the normal operation of the vehicle, wire harness
and other system components.
The faults are discovered by the system and
displayed on the diagnostic instrument.
Check water temperature sensor resistance;
Check if the cylinder cover temperature at the
water temperature sensor matches the temperature
displayed on the ADC2000 decoder.


Five. Throttle position sensor
1. Functions and principles
The throttle position sensor is of a linearly variable
resistance structure and its sliding terminal is driven
by the throttle shaft;
The resistance signal given by the sensor to the ECM
will be different for different throttle opening. The
system will judge real time engine load and dynamic
variations according to the output signals and their
changing speed:
Wiring terminal: A - +5V, B – signal grounding, C –
throttle position signal;
Fixing: the throttle position sensor is located on
the throttle assembly and is coaxal with the
throttle pull rod and throttle.
2. Component parameters:
Range: 7% - 93% opening
Working voltage: 5

±0.1V

Closed throttle: reference voltage 12%

±5%

Wide open throttle: 83%～93%
A, B resistance: 3k～12k

Ω

Working temperature: -40～150ºC

Pin

Idle speed voltage (V)

Pin

Idle speed voltage (V)

A 5

B 0

C

0．46～4.6 (wide open)

3. Fault diagnosis
Tips: All the following judgments are based on the normal operation of the vehicle, wire
harness and other system components.
The faults are discovered by the system and displayed on the diagnostic instrument.
The resistance between Terminal A and B is 3k～12k

Ω;

The measurement of resistance variations between C and A or C and B shall be smooth.
Check the mechanical adjustment between the accelerator pedal and throttle.


Six. Oxygen sensor
1. Functions
The oxygen sensor is one important component in the closed-loop fuel control system. It
adjusts and maintains an ideal AFR and optimizes the transfer efficacy of the three-way
catalyst. When the AFR becomes lower or higher, the oxygen content of the exhaust will
increase or decrease respectively and the oxygen sensor output voltage will decrease and
increase respectively as well. And the AFR information is sent to the ECM then.
The rear and front oxygen sensors have the same structure and are used to monitor
the working efficacy of the accelerant.
The oxygen sensor has zirconia as its sensitive material which consists of the empty part
and the external sensitive part. After the zirconia component is heated up (>300℃) and
actuated, the reference air will go into the empty part through the conduit. The exhaust
will go through the external pole of the zirconia. The oxygen ions shift from the center of
zirconia towards the external pole to form a simple atomic battery and create voltage
between two poles; zirconia can change this output voltage according to the presence of
oxygen in the exhaust and thus judging the oxygen content in the exhaust. The oxygen
sensor is designed to generate a substantial voltage variation around the theoretical AFR
(14.6:1), which is beneficial to the ECM’s accurate judgment of the AFR.

2. Features
- Water proof;
- No need for air filter;
- High temperature, high voltage and thermal
impact resistant
- Superb low temperature parameters
- Superb anti-intoxication capability
- Heater of low energy consumption
- Teflon insulating wires and stainless cast
components are adopted for the oxygen sensor.
3. Component parameters
Component parameters

Temperature

260℃ 450℃ 595℃

High ARF output voltage (mV)

>800

>800

>750

Low ARF output voltage (mV)

<200

<200

<150

Response time from low AFR to high
AFR (ms)

<75 <75 <50

Response time from high AFR to low
AFR (ms)

<150 <125 <90

Internal resistance (

Ω)

<100K

Maximum working temperature (continuous):
- Air exhaust temperature: < 930℃
- Fixing seat: < 600℃
- Casing hexagon: < 500℃
- Wire and protective jacket: < 275℃
- Wire sealing gasket: < 250℃
- Fittings: < 125℃

- Storage temperature: -40 ～100℃
Working conditions:
- Exhaust temperature: 200 ～850℃
- The foreign matter content in the fuel is allowed
to be low than:
Lead – 0.005g/l
Phosphor – 0.0002g/l
Sulfur – 0.04% (weight ratio)
Silicon – 4ppm
MMT – 0.0085g/l

Front Oxygen Sensor

- The engine oil consumption shall not be more
than 0.02l/h;
Fixing position
- Front oxygen sensor is located between the
throttle and the three-way catalyst and the rear
oxygen sensor is behind the three-way catalyst.
Wiring terminal:
A – low signal, B – high signal
C and D – connected with the power source for
heating


4. Fault diagnosis
Tips: All the following judgments are based on
the normal operation of the vehicle, wire harness
and other system components.

Rear Oxygen Sensor

The faults are discovered by the system and
displayed on the diagnostic instrument.
Not enough times to change from high AFR to
low AFR, intoxication with heavy metals (like
lead and manganese), phosphor and sulfur or
damage by overheating.



Seven. Camshaft Position Sensor (CAM)
1. Functions and principles
The camshaft position sensor is a Hall sensor. It is
located in the front of the camshaft and works
together with the signal wheel on the camshaft.
The signal wheel corresponds with a specific
position of the engine and ECM detects the digital
voltage signals from the sensor to determine the
working cylinders of the engine and control them.
Fixing: it is fixed near the camshaft.