Chery A15. Manual - part 45

 

4) Difficult start-up under normal engine speed 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up procedure 

Yes 

Fix the indicated 

malfunction 

1 

Turn the ignition switch to “ON” 
position. Inspect with the diagnostic 
tester to see whether there is any 
malfunction information record. 

No 

Proceed to next step. 

Yes 

Proceed to next step. 

2 

Verify that the air filter is free of any 
blockage. 

No Replace 

Yes 

Proceed to next step. 

3 

After start up, verify that the air intake 
manifold pressure is maintained between 
35-65 kPa at idle speed. 

No 

Fix the leakage of    air 

intake system 

4 

Step on the throttle gently and observe 
whether it’s easy to start up. 

Yes 

Replace and inspect the 

throttle valve and idle 

speed passage 

Yes 

Proceed to next step. 

5 

Connect the fuel manometer valve. Short 
the 30# and 87# pins of the fuel pump 
relay to operate the fuel pump in order to 
verify that the fuel pressure is 
maintained at about 350kPa. 

No 

Proceed to Step 9 

Yes 

Proceed to Step 8 

6 

Apply a voltage supply of 12V directly 
between the battery and the fuel injector 
with special connector, and verify that 
the fuel injector functions normally. 

No 

Proceed to next step. 

Yes 

Proceed to next step. 

7 

After washing and cleaning the fuel 
injector, verify that its function is 
normal. 

No 

Replace the fuel 

injector 

Yes 

Replace the fuel 

8 

Replace the fuel and verify that the fuel 
is deteriorated or contaminated by water.

No 

Proceed to Step 14 

Yes 

Proceed to next step. 

9 

Verify that the fuel pressure is lower 
than 350kPa. 

No 

Proceed to Step 13 

Yes 

Proceed to next step. 

10 

Close the fuel manometer valve. 
Connect the ignition switch again to 
re-operate the fuel pump in order to 
verify that the fuel pressure can be 
established. 

No 

Proceed to Step 12. 

Yes 

Replace fuel pressure 

regulator 

11 

Open the fuel manometer valve and 
clamp the fuel return pipe with the fuel 
tube clamp to stop the fuel return in 
order to verify that the fuel pressure can 
be established quickly. 

No 

Repair or replace the 

fuel injector or the fuel 

pipe 

12 

Verify that the fuel inlet pipe has any 
leakage or blockage. 

Yes 

Repair or replace the 

fuel air inlet pipe 

 

G-68

 

 

 

No 

Replace the fuel pump

Yes 

Repair or replace the 

fuel return pipe 

13 

Verify that the fuel return pipe has any 
leakage or bending. 

No 

Replace the fuel 

pressure regulator 

Yes 

Proceed to next step. 

14 

Disconnect the connector of idle speed 
actuator before the temperature of 
engine coolant reaches 35

0

C in order to 

observe whether the engine speed is 
decreasing. 

No 

Repair or replace the 

idle speed actuator 

Yes 

Proceed to next step. 

15 

Turn the ignition switch to “ON” 
position. verify that the voltages at 
following ECU pins are normal: 13# is 
at about 12V of battery voltage; 80# and 
61# are at zero. 

No 

Inspect the wiring 

harness and plug in 

connector 

Yes 

Proceed to next step. 

16 

Run the engine at idle speed; until the 
coolant temperature reaches normal 
value, then verify that the ignition 
advance angle is normal. 

No 

Adjust the ignition 

advance angle 

Yes 

Proceed to next step. 

17 

Verify that the compression pressure of 
engine cylinder is normal. 

No 

Fix the malfunction 

Yes 

Repair or replace 

18 

Verify that the absolute pressure and 
temperature sensor of air intake 
manifold has any blockage. 

No 

Proceed to next step. 

Yes 

Replace the ECU. 

19 

Verify that the coolant temperature 
sensor is normal. 

No 

Repair or replace 

 

 

 

 

 

 

 

 

 

 

 

 

 

G-69

 

5) Difficult start-up of cold engine 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up procedure 

Yes 

Fix the indicated 

malfunction 

1 

Turn the ignition switch to “ON” 
position. Inspect with the diagnostic 
tester verify that there is any 
malfunction information record. 

No 

Proceed to next step. 

Yes 

Proceed to next step. 

2 

Inspect with multimeter to see 
whether the coolant temperature 
sensor is normal. (Or connect a 
1.5K

Ω resistance in series with 

ECU’s pin of 39# and 35# to replace 
the function of the coolant 
temperature sensor to start up the 
engine. If the engine can be started, it 
indicates that the coolant temperature 
sensor is abnormal.) 

No 

Replace the sensor 

Yes 

Proceed to next step. 

3 

Turn the ignition switch to “ON” 
position and connect the adaptor 
between ECU and the wiring harness. 
Verify that the voltages at following 
ECU pins are normal: 13# is at about 
12V of battery voltage; 80# and 61# 
are at zero. 

No 

Inspect the wiring harness 

and plug in connector 

Yes 

Proceed to next step. 

4 

Verify that the air filter is free of any 
blockage. 

No Replace 

Yes 

Proceed to next step. 

5 

After start up, verify that the air 
intake manifold pressure is 
maintained between 35-65 kPa at idle 
speed. 

No 

Fix the leakage of air 

intake system. 

Yes 

Inspect the throttle valve 

and idle speed passage. 

6 

Step on the throttle gently to verify 
that it is easy to be started up. 

No 

Proceed to next step. 

Yes 

Proceed to next step. 

7 

Disconnect the connector of idle 
speed actuator before the temperature 
of engine coolant reaches 35℃ in 
order to observe whether the engine 
speed is decreasing. 

No 

Repair or replace the idle 

speed actuator 

8 

Connect the fuel manometer valve 
(the connecting point will depend on

Yes 

Proceed to next step. 

 

G-70

 

 

(the connecting point will depend on 
the types of car models). Ground the 
86# pin of the fuel pump relay 
directly. Connect the ignition switch 
to operate the fuel pump relay and the 
fuel pump in order to verify that the 
fuel pressure is maintained at about 
350kPa. 

No 

Proceed to Step 12 

Yes 

Proceed to Step 11 

9 

Provide a voltage supply of 12V with 
special connector between the battery 
and the fuel injector, and verify that 
the fuel injector functions normally. 

No 

Proceed to next step. 

Yes 

Proceed to next step. 

10 

After washing and cleaning the fuel 
injector, verify again that it can 
function normally. 

No 

Replace the fuel injector 

Yes 

Replace the fuel 

11 

Verify that the fuel is deteriorated or 
contaminated with water. 

No 

Proceed to Step 17. 

Yes 

Proceed to next step. 

12 

Verify that the fuel pressure is lower 
than 350kPa. 

No 

Proceed to Step 16. 

Yes 

Proceed to next step. 

13 

Close the fuel manometer valve. 
Connect the ignition switch again to 
re-operate the fuel pump in order to 
verify that the fuel pressure can be 
established. 

No 

Proceed to Step 15 

Yes 

Replace the fuel pressure 

regulator. 

14 

Open the fuel manometer valve and 
clamp the fuel return pipe with the 
fuel tube clamp to stop the fuel return 
in order to verify that the fuel 
pressure can be established quickly. 

No 

Repair or replace fuel 

injector or fuel pipe 

Yes 

Repair or replace the fuel 

air inlet pipe 

15 

Verify that the fuel inlet pipe has any 
leakage or blockage. 

No 

Replace the fuel pump 

Yes 

Repair or replace the fuel 

return pipe 

16 

Verify that the fuel return pipe has 
any leakage or bending. 

No 

Replace the fuel pressure 

regulator 

Yes 

Proceed to next step. 

17 

Verify that the pressure of engine 
cylinder is normal. 

No 

Fix the malfunction 

Yes Repair 

18 

Verify that the engine air intake 
system has any leakage. 

No 

Proceed to next step. 

Yes 

Repair or replace 

19 

Verify that the absolute pressure and 
temperature sensor of air intake 
manifold have any blockages. 

No 

Replace the ECU. 

 

 

G-71