Chery Fora (Elara A520). Manual — part 148

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

31

P0107

Much lower voltage of the air intake

pressure sensor

P0340

Phase sensor signal failure

P0108

Much higher voltage of the air intake

pressure sensor

P0342

Much lower voltage of the phase

sensor

P0112

Indicated temperature is much lower of

the air intake temperature sensor

P0343

Much higher voltage of the phase

sensor

P0113

Temperature is much higher indicated by

the air intake temperature sensor

P0443

Canister control valve drive grade

control circuit failure

P0117

Temperature is much lower indicated by

engine coolant temperature sensor

P0444

Much lower voltage of canister

control valve drive grade control

circuit

P0118

Temperature is much higher indicated by

engine coolant temperature sensor

P0445

Much higher voltage of canister

control valve drive grade control

circuit

P0122

The circuit voltage of throttle position

sensor is much lower

P0480

Air conditioner condenser cooling

fan relay control circuit failure

P0123

The circuit voltage of throttle position

sensor is much higher

P0500 Unreasonable failure of speed signal

P0130

Unreasonable failure of the upstream

oxygen sensor signal

P0506

Rotating speed of idle speed is lower

than target idle speed

P0132

Much higher voltage of upstream oxygen

sensor

P0507

Rotating speed of idle speed is

higher than target idle speed

P0134 Signal failure of upstream oxygen sensor P0508

Idle speed regulator control circuit

voltage is too low

P0135

Heating circuit failure of upstream

oxygen sensor

P0509

Idle speed regulator control circuit

voltage is too high

P0171

Closed loop air fuel ratio control self

adapting exceeds it maximum limit

P0511

Idle speed regulator control circuit

failure

P0172

Closed loop air fuel ratio control self

adapting exceeds it minimum limit

P0560 System voltage signal unreasonable

P0201

The 1st cylinder injector circuit failure P0562

System voltage is too low

P0202

The 2nd cylinder injector circuit failure P0563

System voltage is too high

P0203

The 3rd cylinder injector circuit failure P0601

ECU testing code failure

P0204

The 4th cylinder injector circuit failure P0602 ECU diagnosis data ID code failure

P0230

Fuel pump control circuit failure

P0645

Air conditioner compressor relay

control circuit failure

P0325

Knock sensor circuit failure

P0646

Much lower voltage of air

conditioner compressor relay control

circuit

P0335 Crank shaft position sensor signal failure P0647

Much higher voltage of air

conditioner compressor relay control

circuit

P0336

Crank shaft position sensor signal

P1651 Trouble light control circuit failure

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

32

unreasonable failure

4.2 DIAGNOSIS FLOW WHEN THERE IS DIFFERENT DTC

P0107 Much lower voltage of the air intake pressure sensor

No.

Operating steps

Result

Follow up steps

1

Connect the diagnostic tester and commutator, put the

ignition switch to “ON”

Next step

Yes

To step No. 5

2

Observe “air intake pressure” item in data flow, if it is

about 101kpa (specific data is correlated to that time

air pressure).

No

Next steps

Yes

To step No. 5

3

Take off the joint of cable air intake pressure sensor,

check the voltage between pin No. 3 and pin No. 1 by

multimeter and look if it is around 5V.

No

Next step

Yes

Repair or replace

cable

4

Check if it is short circuit to ground between ECU pin

No. 17, No. 33, No. 37 and sensor connector No.1,

No.3 and No. 4.

No

Next step

Yes

Diagnosis help

5

Start the engine at idle speed. Step on the accelerator

slowly approach to open completely and observe the

value changes of diagnostic tester “air intake

pressure”, the changes should be not big; step on the

accelerator quickly to complete open, the displayed

value should be reach up to 90kpa instantaneous.

No

Replace the sensor

DTC: P0108 Much higher voltage of the air intake pressure sensor

No.

Operating steps

Result Follow up steps

1

Connect the diagnostic tester and commutator, put the

ignition switch to “ON”

Next step

Yes

To step No. 5

2

Observe “air intake pressure” item in data flow, if it is

about 101kpa(specific data is correlated to that time air

pressure)

No

Next steps

Yes

To step No. 5

3

Take off the joint of cable air intake pressure sensor,

check the voltage between pin No. 3 and pin No. 1 by

multimeter and look if it is around 5V.

No

Next step

Yes

Repair or replace

cable

4

Check if it is open circuit or short circuit to power supply

between ECU pin No. 17, No. 33, No. 37 and sensor

connector No.1, No.3 and No. 4.

No

Next step

Yes

Diagnosis help

5

Start the engine at idle speed. Step on the accelerator

slowly approach to open completely and observe the

value changes of diagnostic tester “air intake pressure”,

the changes should be not big; step on the accelerator

quickly to complete open, the displayed value should be

reach up to 90kpa instantaneous.

No

Replace the

sensor

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

33

DTC P0112 Circuit voltage is much lower of the throttle position sensor

No.

Operating steps

Result Follow up steps

1

Connect the diagnostic tester and commutator, put the

ignition switch to “ON”

Next step

Yes

To step No. 5

2

Observe “air intake temperature” item in data flow, if it is

same temperature with air intake pipe(specific data is

correlated to the engine temperature at that time)

Notice: if the value is - 40

there is perhaps open circuit

℃

failure in the circuit.

No

Next step

Yes

Next step

3

Take off the joint of cable air intake temperature sensor,

check the resistance values using multimeter between

sensor connector No. 1 and No. 2 and check if it is

corresponding to its temperature (please reference the

related section of this service manual)

No

Replace sensor

Yes

To step 5

4

Take off the joint of cable air intake temperature sensor,

check the voltage between pin No.1 and pin No.2 by

multimeter and look if it is around 5V.

No

Next step

Yes

Repair or

replace

cable

5

Check if it is open circuit or short circuit to power supply

between ECU pin No. 17, No. 40 and sensor connector

No.1, No.2

No

Next step

Yes

Diagnosis help

6

Start the engine at idle speed. Observe the value changes

of diagnostic tester “air intake temperature”, the value

should increase with the increase of the engine intake air.

No

Replace the

sensor

DTC: P0113 Temperature is much higher indicated by the air intake temperature sensor

No.

Operating steps

Result Follow up steps

1

Connect the diagnostic tester and commutator, put the

ignition switch to “ON”.

Next step

Yes

To step No. 5

2

Observe “air intake temperature” item in data flow, if it is

same temperature with air intake pipe(specific data is

correlated to the engine temperature at that time)

Notice: if the value always is - 40

there is perhaps open

℃

circuit failure in the circuit.

No

Next step

Yes

Next step

3

Take off the joint of cable air intake temperature sensor,

check the resistance values using multimeter between

sensor connector No. 1 and No. 2 and check if it is

corresponding to its temperature (please reference the

related section of this service manual).

No

Replace sensor

Yes

To step 5

4

Take off the joint of cable air intake temperature sensor,

check the voltage between pin No.1 and pin No.2 by

multimeter and look if it is around 5V.

No

Next step

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

34

Yes

Repair or

replace

cable

5

Check if it is short circuit to ground between ECU pin

No. 17, No. 40 and sensor connector No.1, No.2

No

Next step

Yes

Diagnosis help

6

Start the engine at idle speed. Observe the value changes

of diagnostic tester “air intake temperature”, the value

should increase with the increase of the engine intake air.

No

Replace the

sensor

DTC: P0117 Temperature is much lower indicated by engine coolant temperature sensor.

No.

Operating steps

Result

Follow up steps

1

Connect the diagnostic tester and commutator, put

the ignition switch to “ON”.

Next step

Yes

To step 6

2

Observe “coolant temperature” item in data flow, if

it is same temperature with engine temperature

(specific data is correlated to the engine temperature

at that time).

Notice: if the value always is - 40

there is perhaps

℃

open circuit failure in the circuit.

No

Next

Yes

Next step

3

Take off the joint of coolant temperature sensor on

the cable, check the resistance values using

multimeter between sensor connector No. 1 and No.

2 and check if it is corresponding to its temperature

(please reference the related section of this service

manual).

No

Replace sensor

Yes

To step 6

4

Take off the joint of coolant temperature sensor on

the cable, check the voltage between pin No.1 and
pin No.2 by multimeter and observe if it is around

5V.

No

Next step

Yes

Repair or replace

cable

5

Check if it is open circuit or short circuit to power

supply between ECU pin No.39, No. 35 and sensor

connector No.1, No.2.

No

Next step

Yes

Diagnosis help

6

Start the engine at idle speed. Observe the value

changes of diagnostic tester “coolant temperature”,

the value should increase with the increase of the

engine coolant temperature.

No

Replace sensor

DTC: P0118 Temperature is much higher indicated by engine coolant temperature sensor

No.

Operating steps

Result

Follow up steps

1

Connect the diagnostic tester and commutator, put

the ignition switch to “ON”.

Next step

Yes

To step 6

2

Observe “coolant temperature” item in data flow, if

it is same temperature with engine temperature

(specific data is correlated to the engine temperature

No

Next