DTC code

Component

Fail-Safe Operation

Fail-Safe Lifting Condition

P0262, P0261, P0201, P0268,
P0267, P0203, P0271, P0270,

P0204, P0265, P0264, P0202

Injectors 1,2,3,4

Prolonged Fault, Misfire

Eligible Requirements
Detected

P0030, P0031 and P0032

Pre-Catalytic Oxygen Sensor
Circuit

Oxygen Sensor Internal
Resistance Diagnosis Stop

Eligible Requirements
Detected

P0036, P0037 and P0038

Post-Catalytic Oxygen Sensor
Circuit

Oxygen Sensor Internal
Resistance Diagnosis Stop

Eligible Requirements
Detected

P0480, P0481, P0691, P0692

and P0694

High and Low-Speed Cooling
Fan Relay

N/A

N/A

P0645, P0646 and P0647

Air-Conditioning Relay

N/A

N/A

P0627, P0628 and P0629

Fuel Pump Relay

Engine Can Not Start

 

P0650

MIL Lamp Circuit

N/A

N/A

P0508, P0509, P0511

Stepper Motor Driver Stage
Circuit

N/A

N/A

P0444, P0458 and P0459

Canister Driver Stage Circuit

Close Post-Catalytic Oxygen
Sensor Control

Eligible Requirements
Detected

U0140

BCM and ECM Communication N/A

N/A

U0121

ABS and ECM Communication N/A

N/A

U0151

Airbag Controller and ECM
Communication

N/A

N/A

U0001

CAN

N/A

N/A

P0606

Electronic Control Unit Code
Fault

N/A

N/A

P1610, P1611, P1612, P1613,

P1614

Anti-theft Controller

Engine Can Not Start

Turn On Power, Anti-theft
Authentication Successful

P0300, P0301, P0302,

P10303, P0304

Spark Plug, Fuel Injector,
Ignition Coil, etc.

One or More Cylinder Misfire

Restart

P0328, P0327

Knock Sensor

Ignition Angle Delay

Fault Repair, Knock Sensor
Working Properly

P000A

VVT

Calculate the basic ignition
angle when the camshaft
adjustment is no longer
considered.

Eligible Requirements
Detected

P0012

VVT

Calculate the basic ignition
angle when the camshaft
adjustment is no longer
considered.

Eligible Requirements
Detected

Engine

Control System JL4G18-D

2-55

DTC code

Component

Fail-Safe Operation

Fail-Safe Lifting Condition

P0016

Crankshaft and Camshaft
Relative Installation Position

Misfire cylinder can not be
determined. Cylinder group
fuel injection.

Eligible Requirements
Detected

P0010, P2088, P2089

VVT Circuit

Stop VVT diagnosis.

Eligible Requirements
Detected

P0420

Catalytic Converter Oxygen
Storage Capacity Aging
(Emission Over Limit)

Stop catalytic converter related
self learn.

Replace new three-way
catalytic converter.

P0053

Pre-Catalytic Heated Oxygen
Sensor Internal Resistance
Unreasonable

Stop some diagnosis.

Check circuit fault or replace
Pre-Catalytic heated oxygen
sensor.

P0054

Post-Catalytic Heated Oxygen
Sensor Internal Resistance
Unreasonable

Stop some diagnosis.

Check circuit fault or replace
Post-Catalytic heated oxygen
sensor

P0130, P0131, P0132, P0134

Pre-Catalytic Heated Oxygen
Sensor Signal Unreasonable

Entering Into Open-loop
Control

Check circuit fault or replace
Pre-Catalytic heated oxygen
sensor.

P0133, P2195, P2196

Pre-Catalytic Heated Oxygen
Sensor Aging

No

Replace Pre-Catalytic heated
oxygen sensor.

P0136, P0137, P0138, P0140

Check Post-Catalytic heated
oxygen sensor signal circuit.

Disconnect the Post-Catalytic
heated oxygen sensor.

Check circuit fault or replace
the Post-Catalytic heated
oxygen sensor.

P2270, P2271

Post-Catalytic Heated Oxygen
Sensor Aging

Disconnect the Post-Catalytic
heated oxygen sensor.

Replace the Post-Catalytic
heated oxygen sensor.

P2177

Air-Fuel ratio close-loop control
self learn value is higher than
maximum limit.

No Protection Needed

Check fuel line fault.

P2178

Air-Fuel ratio close-loop control
self learn value is lower than
minimum limit.

No Protection Needed

Check fuel line fault.

P2187

Air-Fuel ratio close-loop control
self learn value is higher than
maximum limit (Low-Load
Zone).

No Protection Needed

Check fuel line fault.

P2188

Air-Fuel ratio close-loop control
self learn value is lower than
minimum limit (Low-Load
Zone).

No Protection Needed

Check fuel line fault.

2-56

Control System JL4G18-D

Engine

2.2.7.9 Data Stream List

By reading the "Data Stream List" on the scan tool, you can check switches, sensors, actuators working state without removing any
parts.  Before  the  control  system  diagnosis,  observing  and  analyzing  data  is  the  first  step,  so  that  the  diagnose  time  could  be
shortened.

Note

Data under normal conditions is listed in the following table for reference only. Do not determine whether a part is faulty
solely based on these reference values. Under normal circumstances you can compare the vehicle that needs to be
repaired with a normal working vehicle in the same state to determine the current vehicle diagnostic data is normal or
not.

1. Run the engine to reach normal working temperature.

2. Turn the ignition switch to "OFF" position.

3. Connect the scan tool.

4. Turn the ignition switch to "ON" position.

5. Select "Engine"/"Read data stream".

6. Refer to the table and check all the data.

Data Stream Name

Ignition Switch

"ON"

Idle Speed

2,500 rpm

When

Diagnosis Description

Battery Voltage

12.04 V

13.51 V

13.72 V

ECM monitors the current charging system
working conditions.

Engine Speed

0 rpm

800 rpm

2,500 rpm

The scan tool shows the current actual engine
speed calculated by ECM through the crankshaft
position sensor input.

Target Idle Speed (No

Compensation)

800 rpm

800 rpm

1,500 rpm

The scan tool shows the target idle speed set by
ECM and the current actual idle speed, said ECM
instructions. ECM-based engine coolant
temperature sensors signal and compensation
signals for various engine loads in order to
maintain desired engine idle speed.

Target Idle Speed

(With Compensation)

800 rpm

800 rpm

800 rpm

Vehicle Speed

0 km

0 km

0 km

-

Engine Coolant

Temperature Sensor

Voltage

0.5 V

0.5 V

0.4 V

The scan tool shows -40°C (-40 ºF) to 130°C
(266 ºF). After heating, sensor (internal
resistance decreases) voltage signal reduces.
ECM will interpret the reduced voltage signal as
engine warmed up. This signal is one of the
conditions used to determine whether to activate
the closed-loop fuel system control, and also an
important injection timing reference signal.

Engine Coolant

Temperature

91°C (196 ºF)

89°C (192 ºF)

94°C (201 ºF)

Intake Air

Temperature Sensor

2.5 V

2.5 V

3.0 V

Sensor voltage is the value actually received by
ECM. The intake air temperature is calculated by
ECM using the received voltage signal according
to the program. ECM apply the intake air
temperature to adjust the fuel delivery and

Engine

Control System JL4G18-D

2-57

Data Stream Name

Ignition Switch

"ON"

Idle Speed

2,500 rpm

When

Diagnosis Description

Intake Air

Temperature

23°C (73.4 ºF)

23°C (73.4 ºF)

14°C (57.2 ºF)

ignition timing according to the air density. The
intake air temperature is also compared with the
ECT to identify the start up of the heating wire of
the heated oxygen sensor and diagnosis of
evaporative emissions from cold start.

Ambient Temperature

10°C (50 ºF)

10°C (50 ºF)

10°C (50 ºF)

Varies as the ambient temperature changes.

The Actual Intake

Manifold Pressure

Sensor Voltage

4.02 V

1.0 V

0.71 V

1. Equal to atmospheric pressure when engine

is turned off.

2. Voltage first reduced and then increased

when pressing the acceleration pedal hard.

3. After engine is turned off, the data stream

shows the pressure is close to atmospheric
pressure, voltage close to 5 V.

The Actual Intake

Manifold Pressure

1,020 kPa (148

psi)

340 kPa (49 psi) 260 kPa (38 psi)

Intake Air Mass

0.0 g/s

10.2 g/s

29.4 g/s

 

Stepper Motor Target

Location

69 step

40 step

93 step

After engine is turned off, it shows 110 steps.
Warmed vehicle idling state, it is typically about
30 to 45 steps. The number of steps increases as
the load increases like Air-Conditioning turned
on, up to 70 steps. With the increase in vehicle
mileage, the stepper motor opening will increase.
After cleaning the stepper motor and the intake
air channel next to the throttle body, the steps will
not decrease during the startup. But the engine
speed will increase.

Throttle Angle ADC

Signal

0.55 V

0.56 V

0.70 V

Throttle position sensor voltage is the voltage
Measure by ECM. While the angle is calculated
according to voltage. When at idle, the voltage is
0.3-0.9V. With full-throttle the voltage is
4.25-4.7V. The voltage increases as the throttle
opening increases. The self learn value will
become larger and larger when the throttle body
is dirty and move up the zero value. After cleaning
the throttle, the computer will automatically re-
learn.

Calculating Throttle

Position and Angle

Signal

11.1%

11.23%

14.06%

Calculating Throttle

Position

0%

0%

2%

Charging Time

3.6 ms

3.0 ms

3.0 ms

-

2-58

Control System JL4G18-D

Engine