Chery A series. Manual — part 43

Diagnostic trouble code: P1651 “Malfunction in control circuit of malfunction

alarm light”

Item

No.

Operation procedure

Inspection

results

Follow-up procedure

1

Connect diagnostic tester and adaptor,
and turn the ignition switch to “ON”
position.

Proceed to next step

Yes

Proceed to next step

2

Check the action of engine malfunction
alarm light by using the “actuator
action testing" function of diagnostic
tester and observe whether the light is
always on or off.

No Normal

operation

Yes

Repair or replace the

wiring harness.

3

Verify that the supply circuit of engine
malfunction alarm light is open or short
to ground.

No

Proceed to next step

Yes

Repair or replace the

wiring harness.

4

Check if the supply circuit between the
control terminal pin of engine
malfunction alarm light and 29# pin of
ECU is open, or is short to ground or
power supply.

No

Refer to diagnosis

help.

G-61

PROCEDURES FOR FAULT DIAGNOSIS ACCORDING TO THE

SYMPTOMS OF THE ENGINE

A preliminary inspection should be carried out before implementing the steps of fault
diagnosis according to the symptoms of engine:

(1) Verify that there is no abnormal behavior with the ECU and malfunction indicator

light (not applicable for car models without setting of malfunction indicator light).

(2) Inspect with the diagnostic tester or flashing light to verify that there is no

malfunction information record.

(3) Inspect the idle speed data of warmed up engine in the electronic control system

with the diagnostic tester and verify that they are normal.

(4) Verify that the malfunction symptom complained by the car owner exists and

locate the exact position of the symptom.

Then carry out the visual inspection: Verify that the grounding point of the wiring
harness is clean and firm.

Verify that the vacuum pipelines have any ruptures or twists together, and whether its
connections are correct.

Verify that the pipeline has any symptom of blockage.

Verify that the air inlet pipeline is flattened or damaged.

Verify that the sealing between the throttle body and the air intake manifold is in a
good condition.

Verify that the high voltage cable of ignition system has any rupture or ageing, and
whether the wire routing is correct.

Verify that the connection of conducting wire is correct and whether the connector is
loose or poorly contacted.

G-62

1) The engine is not running or running slowly during starting

Item Operation

procedure

Inspection

results

Follow-up procedure

Yes

Proceed to next step

1

Inspect with multimeter to see whether there
is a voltage of about 10-12.5V between two
battery terminals.

No

Repair or replace the

battery

Yes

Proceed to next step.

2

Turn the ignition switch to “ON” position.
Inspect with multimeter to see whether there
is a voltage of about 10-12.5V between the
terminals connecting the ignition switch and
the positive grid of the battery.

No

Repair the terminal

or replace the

conducting wire

Yes

Proceed to next step.

3

Keep the ignition switch at the startup
position and inspect with multimeter to see
whether that there is a voltage of more than
8V between the terminals connecting the
ignition switch and the starting motor
magnetic clutch.

No

Repair or replace the

ignition switch

Yes

Repair or replace the

starting motor

4

Inspect with multimeter to see whether the
starting motor has any open or short-circuit.

No

Proceed to next step.

Yes

Fix the malfunction

5

Verify that the engine is jammed due to
poor lubricating.

No

Proceed to next step.

Yes

Replace with

appropriate

lubricating oil

6

In case of winter season, inspect to see
whether there is too much friction in the
starting motor due to the improper selection
of engine lubricating oil and gearbox oil.

No

Inspect other items

G-63

2) The engine can run but cannot successfully start up during starting

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 Step 8.

2

Disconnect the cylinder distribution wire and
connect it to the spark plugs, make a space of
5-10mm between the grid of the spark plug
and engine body. Then turn on the engine
with starting motor, verify that there is any
bluish-white high-voltage spark.

No

Proceed to next step.

Yes

Proceed to next step.

3

Verify that the resistance of the high voltage
cable is normal

No

Repair or replace high

voltage cable

Yes Replace

4

Verify that the cylinder-distribution high
voltage cable and spark plug have any
damage.

No

Proceed to next step.

Yes Replace

5

Verify that the cylinder identification rotor
ring in distributor is loose or damaged.

No

Proceed to next step.

Yes

Proceed to next step.

6

Verify that the ignition coil is normal

No Replace

Yes

Proceed to next step.

7

Verify that the plug in connector of the
camshaft is properly connected.

No

Connect the connector

properly

Yes

Proceed to next step.

8

Turn the ignition switch to “ON” position.
Verify that the fuel pump relay and fuel
pump is functional.

No

Service the fuel pump

circuit

Yes

Proceed to next step.

9

Connect it to the fuel manometer valve.
Make the 30# and 87# pins of fuel pump
relay short so as to operate the fuel pump,
and then verify that the fuel pressure is
maintained at about 350kPa.

No

Proceed to Step 13.

Yes

Proceed to Step 12.

10

Pull out the fuel distributing pipe together
with the fuel injector and disconnect the fuel
injector connectors on the wiring harness one
by one. Connect a 12V supply directly from
the battery to the fuel injector and verify that
the fuel injector is functioning.

No

Proceed to next step.

Yes

Proceed to next step.

11

After washing and cleaning the fuel injector,
verify that it is capable of injecting fuel
again.

No

Replace the fuel

injector

G-64