Geely Diagnosis Flow. Manual part — 33

129

No.068 Diagnosis and solution of common malfunctions of JL376/378QE engine’s electric control system

Serial No. Malfunction

Display by diagnosis instrument Analytic

procedure

Causes

Measures

1.

After startup, flame out
after about 10s at idling
speed. Hard to start again,
and flame out when
throttling up the engine

λ integral quantity exceeding lower limit
oil injection correction: -25%
voltage of oxygen voltage is 800mv

Obviously oil injection not normal; check
hardware of oil supply system is working
normally

ECU malfunction; malfunction
disappears after replacement
of ECU

Replace ECU

2.

Unable to startup (started
before); normally started
once during exhaust

Diagnosis instrument ON, but unable to
communicate with ECU

Key placed to the second position, and
check ECU27 pin is with 12V voltage, 19
pin is connected to vehicle body

Fuse broken, causing ECU27
pin without voltage

Replace fuse

3.

Unable to startup

Diagnosis instrument without display

Electric injection system without power
supply
check ECUl8 pin is with 12V voltage, 19
pin is connected to vehicle body

Fuse broken, causing ECU18
pin without power supply
voltage

Replace fuse

4.

Startup with burning, and
flame out immediately after
engine’s rotating speed
rises

Two malfunctions:
-

Throttle valve position sensor shorted

to earth
-

Pressure sensor shorted to earth

Measure connections between
above-mentioned sensors and ECU, and
connections among them and with the
ground with multimeter.

ECUl2 pin not ON with
above-mentioned sensors,
but ON with hall element

Replace harness

5.

Instable idling speed, but
actually operation very
normal

/ / /

/

6.

Instable idling speed,
sometimes high and
sometimes low

/ Not

malfunction

Self-learning of stepper motor
not completed

Flame out, wait for 10s, and
re-start

7.

Unable to start

Without malfunction. When the motor is
working, diagnosis instrument displays
that rotating speed of the engine is 0rpm

Check hall element is working normally

Hall element 48 pin broken

Improve harness quality

8.

Unable to start

Without malfunction.

Oil pump relay is with closing sound, but
oil pump not working normally

Check fuse or lines from oil
pump relay to oil pump

130

No.069 Flashing code list of M1.5.4 series

Serial

No.

Designation of malfunction code

Flashing code

Malfunction

type

Malfunction

lamp

1

Knock sensor (zero measuring testing status)

1

1

1

2 Malfunction-free

11

-

-

3

Temperature sensor of AC condenser

13

1

0

4

Throttle valve position sensor

14

1

1

5 Condensing

sensor

15

2

1

6

Intake pressure sensor

16

1

1

7 oxygen

sensor

17

1

1

8

Intake temperature sensor

18

1

1

9

Cooling liquid temperature sensor

19

1

1

10

Oil injector-4 cylinders

21

1

1

11

Oil injector-1 cylinder

22

1

11

12

Oil injector-2 cylinders

23

1

1

13

Oil injector-3 cylinders

24

1

1

14

Canister control valve

25

1

1

15

Correction coefficient of air fuel ratio control

31

2

0

16

Maximum speed limit of the engine

33

2

0

17

Electronic control unit

34

2

1

18

Addition correction self-learning of air fuel ratio control (work when
under idling speed range)

35 2 0

131

19

Multiplication correction self-learning of air fuel ratio control (work
when under driving conditions)

36 2 0

20

Addition correction self-learning of air leakage of air fuel ratio control

37

2

0

21 Battery

38

2

0

22 Vehicle

speed

signal

41

2

0

23

Cooling fan relay

42

1

1

24 Cylinder

signal

43

2

0

25

Malfunction indicating lamp

45

1

0

26

Speed governor driver stage 1

61

1

1

27

Speed governor driver stage 2

62

1

1

Malfunction type: : “1” broken circuit or short circuited to ground or power source “2”

signal

overrun

Malfunction lamp: : “1”ON

“0” OFF

Steps for reading flashing code:

1. Switch on ignition switch of the engine, but unable to start the engine.

2. Connect K line (ECU-55# or OBD diagnosis connector

Ⅱ

-7#) to earth, and the time exceeds

2.5 seconds.

3. Malfunction stored in the malfunction memorizer is output in flashing mode through
malfunction indicating lamp.

4. Each flashing code is made up of 2 numbers, and each number is made up of 0 or 1-9.

5. Number 0 flashes ten times, and numbers 1-9 flash respectively 1-9 times; interval of two
numbers pauses (one second) when flashing, and neighboring malfunction code will pause for
long time (3 seconds).
6. The same malfunction code flashes continuously for 3 seconds. And all malfunction codes
flash continuously, till the engine is started or reading action of malfunction terminates.
7. If there is no malfunction stored within malfunction memorizer, then “without malfunction”
flashes, i.e. “11”.

132

Diagnosis flowchart of M7.9.7 system of 479Q/QA/481Q according

to malfunction code

Description: 1. check the following only when confirmed as current stable status malfunction;
otherwise it will cause incorrect diagnosis.
2. “Multimeter” mentioned hereinafter refers to digital multimeter. Do not use pointer type
multimeter to check lines of electric injection system.
3. Check vehicles with burglary protection system. If ECU to be replaced in the “Follow-ups”,
make programming to ECU after replacement.
4. For this project: When P0171, P0172, P0335, P0336, P1651 malfunction codes exist,
engine’s malfunction lamp is not ON.
5. If malfunction code indicates voltage of certain circuit is too low, it means that this circuit may
be shorted to ground; if malfunction code indicates voltage of certain circuit is too high, it means
that this circuit may be shorted to power source; if malfunction code indicates certain circuit is
malfunction, it means that this circuit may be opened or there is malfunction to many lines.
Diagnosis help: 1. Malfunction code could not be eliminated, malfunction is stable status
malfunction; if chance failure, mainly check harness connector is loosening.
2. No unusual conditions are found after inspection according to above-mentioned steps;
3. During inspection, pay attention to effect of automobile maintenance, cylinder pressure,
mechanical ignition timing on the system;
4. Replace ECU and test it. If malfunction code could be eliminated at this point, then malfunction
part is located in ECU; if not eliminated, replace for original ECU, and repeat the flowchart, and
recheck it.

No.070 Malfunction code: P0107 "voltage of intake pressure sensor

circuit too low"

Serial

No.

Operation steps

Results

Follow-ups

1

Switch on diagnosis instrument and commutator, and place ignition switch to “ON”.

Next step

Yes

To step 5

2

Observe “inlet pressure” of data flow, and check value is around 101kpa (specific
value related to the air pressure at that time).

No Next

step

Yes

To step 5

3

Take out the connector of intake pressure sensor of the harness, and check voltage
between 3# and 1# pins of this connector is around 5V with multimeter.

No Next

step

Yes

Repair or replace
harness

4

Check lines respectively between 17#, 33#, 37# pins of ECU and 1#, 3#, 4# pins of
sensor connector are shorted to ground.

No Next

step

Yes Diagnosis

help

5

Start the engine and make it operate at idling speed. Step the throttle slowly to be
close to full opening, and observe changes of value of “inlet pressure” on the
diagnosis instrument, and values shall not be largely changed at this time; step the
throttle quickly to be close to full opening, and value shall reach above 90kpa
immediately at this time.

No Replace

sensor