Chery Tiggo T11 LHD. Manual — part 53

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5) Limp-home

For some identified important failures, when their duration exceeds the setting stabilized time,

the ECU will apply appropriate software countermeasure to maintain the operation of the

engine and enable the vehicle not to stop in its way.

6) Failure Alarm

MT 20U electronic fuel injection system is equipped with a failure lamp. When some

important parts, such as the ECU, intake manifold absolute pressure sensor, throttle position

sensor, coolant temperature sensor, knock sensor, oxygen sensor, fuel injector, two drivers of

idle actuator stepper motor, A/C relay, fan relay and etc, fail to operate and the corresponding

failure flags are set, the ECU will enable the failure lamp to flash and give alarm to warn the

owner of the vehicle that your vehicle has already entered into the failure mode, till the failure

flag is reset.

7) Definition of Diagnosis Connector Interface

7.

8) Failure Readout by Engine Failure Lamp

When the engine system or its components failure occurs during the operation of engine, the

engine failure lamp will light automatically to remind the driver to examine and repair his/her

vehicle in time.

During the emergency failure handling, you also may conduct some special operations to

enable the engine failure lamp to flash frequently so as to read the engine failure code, which

is the most economical means to obtain the failure code. Its operation method is as follows:

Examine and Confirm:

a. The voltage of battery shall ensure the engine gets its startup speed;

b. The engine and the whole vehicle’s accessories shall be in the state of shutdown;

c. The throttle is fully closed;

d. The transmission is placed in the neutral gear;

Definition of Diagnosis Connector Interface

8

NULL

16

+12 V

7

Communication

15

NULL

6

NULL

14

NULL

5

Earth Wire

13

NULL

4

Earth Wire

12

NULL

3

NULL

11

NULL

2

NULL

10

NULL

1

Diagnosis

Request

9

NULL

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e. The ignition switch is turned off;

f. Apply wires to enable the diagnosis request terminal 1 of the failure diagnosis

connectors to short circuit with the earth wire terminal 4 or 5;

g. Turn the ignition switch to ON, but don’t start up the engine;

In this case, if the system currently has a failure or a history failure code uncleared after

the failure removal, the engine failure lamp will flash in accordance with a certain rule, and

the output system detects the code of failure; (the failure code is read out and, at the same

time, the idle control valve will conduct the reset action);

After the completion of failure code readout, the ignition switch is turned off and the

diagnosis request short-circuit wire is removed;

The rules that the failure lamp flashes to report the failure are:

 Report the failure in accordance with the sequence of failure code memorized;

 3.2 s pause between two failure codes. The digits flash at the frequency of light for 0.4 s

and extinguish for 0.4s, with 1.2 s pause between two digits;

 The number 0 flashes10 times, and other numbers corresponds to the flash numbers;

 Taking the failure code 0110 and 0443 as an example:

If the diagnosis request doesn’t interrupt, restart to report 0110 failure code .

CAUTION: After the removal of failure, it is recommended to apply the failure diagnosis

instrument to clear these failure codes so as not to make an influence on the failure detection

during the next repair.

ISO 9141-2 Standard Diagnosis Connector

Diagnosis request short circuit to earth

Turn on the ignition switch

Failure lamp flashes for one time

Pause for 3.2s

10 times

Pause for 1.2s

1 time

Pause for 1.2s

10 times

Pause for 3.2s

10 times

Pause for 1.2s

4 times

Pause for 1.2s

4 times

Pause for 1.2s

3 times

Pause for 3.2s

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9) Removal of Failure Information Record

After a failure is removed, the failure information record stored in a memory shall be cleared.

Although failure information has occurred when the ignition switch is turned on, it isn’t

recorded if it isn’t kept up to the end of stabilized time.

After the engine starts up successfully the specified times, the failure code will be cleared

automatically.

Apply a failure diagnosis instrument and the “Failure Memory Reset” instruction to clear the

failure information record.

Pull out the connector from ECU or remove the wires of battery to clear the failure

information record stored in the external RAM.

10) Failure Search

After a failure information record is obtained with the help of the means above, only the

approximate location where the failure occurs is known, but it doesn’t mean that the failure is

found because the reason to create a failure information may be the damage of a electrical

component (such as sensor or actuator or ECU, etc.), open circuit of a wire, short circuit of a

wire to earth or the positive electrode of battery, even may be a mechanical fault.

The failure is inherent, and its external expressive results are various kinds of symptoms.

After a symptom is found, it is required firstly to use a failure diagnosis instrument or some

flash codes to check whether there are some failure information records. And, based on these

information records, the related failure shall be removed. Then, you can search the failure in

accordance with the symptom of the engine.

Diagnosis Interface

Power Supply

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2. Engine Failure Code Table

Delphi MT 20U Engine Management System Failure Code Table

Code

Description

Code

Description

P0105-1 Over-high intake manifold absolute

pressure sensor signal

P0443-1 Short-circuit between the wire of canister

control solenoid valve and the positive of

electrode power supply

P0105-2 Too-low

intake

manifold

absolute

pressure sensor signal

P0443-2 Open circuit of the wire of canister

control solenoid valve or short circuit to

earth

P0110-1 Too-low intake temperature sensor signal

P0480-1 Short circuit of radiator low-speed fan

relay drive circuit to the positive

electrode of power supply

P0110-2 Over-high intake temperature sensor

signal

P0480-2 Open circuit of radiator low-speed fan

relay drive circuit or short circuit to earth

P0115-1 Too-low coolant temperature sensor

signal

P0481-1 Short circuit of radiator high-speed fan

relay drive circuit to the positive

electrode of power supply

P0115-2 Over-high coolant temperature sensor

signal

P0481-2 Open circuit of radiator high-speed fan

relay drive circuit or short circuit to earth

P0120-1 Over-high throttle position sensor signal

P0482-1 Short circuit of A/C cooling fan relay

drive circuit to the positive electrode of

power supply

P0120-2 Too-low throttle position sensor signal

P0482-2 Open circuit of A/C cooling fan relay

drive circuit or short circuit to earth

P0130-4 No oxygen sensor signal

P0500-0 No vehicle speed sensor signal

P0135-1 Short circuit of oxygen sensor heating

circuit to the positive electrode of power

supply

P0505-0 Idle control error

P0135-2 Open circuit of oxygen sensor heating

circuit or short circuit to earth

P0560-1 Over-high system voltage

P0170-1 Over-long oxygen sensor indication of

time of rich air-fuel-ratio

P0607-0 Knock control system failure

P0170-2 Over-long oxygen sensor indication of

time of lean air-fuel-ratio

P0650-1 Short circuit between the failure lamp

wire and the positive electrode of power

supply

P0201-0 Fuel injector A (No 1 cylinder) circuit

failure

P0650-2 Open circuit of the failure lamp wire or

short circuit to earth

P0202-0 Fuel injector B (No 3 cylinder) circuit

failure

P1230-1 Short circuit of main relay circuit to the

positive electrode of power supply

P0203-0 Fuel injector C (No 4 cylinder) circuit

failure

P1230-2 Open circuit of main relay circuit or

short circuit to earth