DTC Code

Description

Diagnostic Procedures

P0321

Speed Reference Point Fault

Refer to 

2.2.7.29

 

DTC P0321 P0322

.

P0322

No CKP sensor Pulse Signal (Open or Short
Circuit)

P0327

Knock Sensor Signal Circuit Voltage Too
Low

Refer to 

2.2.7.30

 

DTC P0327 P0328

.

P0328

Knock Sensor Signal Circuit Voltage Too
High

P0340

Improper Camshaft Position Sensor
Installation Location

Refer to 

2.2.7.31

 

DTC P0340-P0343

.

P0341

Camshaft Position Sensor Poor Connection

P0342

Camshaft Position Sensor Circuit Short to
Ground

P0343

Camshaft Position Sensor Circuit Short to
Power Supply

P0420

Three-way Catalytic Converter Oxygen
Storage Capacity Aging (Emission Over
Limit)

Refer to 

2.2.7.32

 

DTC P0420

.

P0444

Canister Control Valve Control Circuit Open

Refer to 

2.2.7.33

 

DTC P0444 P0458 P0459

.

P0458

Canister Control Valve Control Circuit
Voltage Too Low

P0459

Canister Control Valve Control Circuit
Voltage Too High

P0480

Cooling Fan Relay Control Circuit Open
(Low Speed)

Refer to 

2.2.7.34

 

DTC P0480 P0481 P0691 P0692 P0693 P0694

.

P0481

Cooling Fan Relay Control Circuit
Malfunction (High Speed)

P0501

Vehicle Speed Sensor Signal Unreasonable Refer to 

2.2.7.35

 

DTC P0501

.

P0506

Idle Control Speed Lower Than Target Idle
Speed

Refer to 

2.2.7.36

 

DTC P0506-P0509 P0511

1.

P0507

Idle Control Speed Higher Than Target Idle
Speed

P0508

Stepper Motor Driver Pin Circuit Short to
Ground

P0509

Stepper Motor Driver Pin Circuit Short to
Power Supply

P0511

Stepper Motor Driver Pin Circuit Open

P0560

System Battery Voltage Signal
Unreasonable

Refer to 

2.2.7.37

 

DTC P0560 P0562 P0563

.

Engine

Control System JL4G18-D

2-67

DTC Code

Description

Diagnostic Procedures

P0562

System Battery Voltage Too Low

P0563

System Battery Voltage Too High

P0602

Electronic Control Unit Code Fault

Refer to 

2.2.7.38

 

DTC P0602

.

P0627

Pump Relay Control Circuit Open

Refer to 

2.2.7.39

 

DTC P0627 P0628 P0629

.

P0628

Pump Relay Control Circuit Short to Ground

P0629

Pump Relay Control Circuit Short to Power
Supply

P0645

A/C Compressor Relay Control Circuit Open

Refer to 

2.2.7.40

 

DTC P0645-P0647

.

P0646

A/C Compressor Relay Control Circuit Short
to Ground

P0647

A/C Compressor Relay Control Circuit Short
to Power Supply

P0650

MIL Lamp Driver Circuit Malfunction

Refer to 

2.2.7.41

 

DTC P0650

.

P0691

Cooling Fan Relay Control Circuit Short to
Ground (Low Speed)

Refer to 

2.2.7.34

 

DTC P0480 P0481 P0691 P0692 P0693 P0694

.

P0692

Cooling Fan Relay Control Circuit Short to
Power Supply (Low Speed)

P0693

Cooling Fan Control Circuit Short to Ground
(High Speed)

P0694

Cooling Fan Control Circuit Short to Power
Supply (High Speed)

P1523

Airbag to ECU Signal Interrupted or
Incorrect

Refer to 

2.2.7.43

 

DTC P1523 U0001 U0121 U0140 U0151

.

P1610

Anti-theft Malfunction

Refer to 

2.2.7.42

 

DTC P1610-P1614

.

P1611

Anti-theft Malfunction

P1612

Anti-theft Malfunction

P1613

Anti-theft Malfunction

P1614

Anti-theft Malfunction

P2088

VVT Intake Control Solenoid Valve Circuit
Short to Ground

Refer to 

2.2.7.12

 

DTC P0010 P2088 P2089

.

P2089

VVT Intake Control Solenoid Valve Circuit
Short to Power Supply

Refer to 

2.2.7.12

 

DTC P0010 P2088 P2089

.

P2177

Air-Fuel Ratio Closed-loop Control self learn
Higher Than Maximum Limit

Refer to 

2.2.7.23

 

DTC P0170 P0171 P0172 P2177 P2178 P2187

P2188

.

P2178

Air-Fuel Ratio Closed-loop Control self learn
Lower Than Minimum Limit

2-68

Control System JL4G18-D

Engine

DTC Code

Description

Diagnostic Procedures

P2187

Air-Fuel Ratio Closed-loop Control self learn
Higher Than Maximum Limit (Low-Load
Zone)

Refer to 

2.2.7.23

 

DTC P0170 P0171 P0172 P2177 P2178 P2187

P2188

.

P2188

Air-Fuel Ratio Closed-loop Control self learn
Lower Than Minimum Limit (Low-Load
Zone)

P2195

Pre-Catalytic Oxygen Sensor Aging (Too
Lean)

Refer to 

2.2.7.21

 

DTC P0130 P0131 P0132 P0133 P0134 P2195

P2196

.

P2196

Pre-Catalytic Oxygen Sensor Aging (Too
Rich)

P2270

Post-Catalytic Oxygen Sensor Aging (Too
Lean)

Refer to 

2.2.7.22

 

DTC P0136 P0137 P0138 P0140 P2270 P2271

.

P2271

Post-Catalytic Oxygen Sensor Aging (Too
Rich)

U0001

CAN High-Speed Communication Bus
Malfunction

Refer to 

2.2.7.43

 

DTC P1523 U0001 U0121 U0140 U0151

.

U0121

Communication With ABS Controller
Interrupted

U0140

Communication With BCM Interrupted

U0151

Communication With airbag control module
Interrupted

2.2.7.12 DTC P0010 P2088 P2089

1. DTC Descriptor:

DTC

P0010

VVT Intake Control Solenoid Valve Circuit Open

DTC

P2088

VVT Intake Control Solenoid Valve Circuit Short to Ground

DTC

P2088

VVT Intake Control Solenoid Valve Circuit Short to Power Supply

The  intake  camshaft  position  actuator  is  connected  to  the  intake  camshaft  and  operated  by  hydraulic  pressure.  The  hydraulic
pressure is provided by the engine oil pump in order to change the intake camshaft to the crankshaft relative position (CKP ) angle.
The intake VVT solenoid valve power supply is provided by The Main Relay. ECM modulates the pulse-width to control signal ground,
thus controlling the camshaft position actuator engine oil flow. Engine oil pressure moves the camshaft position actuator slide valve
at the front of the camshaft. When the safety slide valve is operated, the engine oil is imported into the camshaft position actuator,
so that camshaft rotates. The intake camshaft cam actuator can change the camshaft working angle up to 50°.

ECM controls the solenoid valve internal ground by ECM harness connector EN01 terminal No.2. There is a feedback circuit within
ECM. ECM monitors the feedback signals to determine whether there is an open control circuit, or a short to ground circuit or a short
to power supply circuit. If ECM detects the control circuit voltage is within a predetermined range, when being disconnected, this
DTC code is set.

Engine

Control System JL4G18-D

2-69

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC

(Control Strategy)

Fault Locations

P0010
P2088
P2089

Hardware Circuit Checks

1. Circuit Open.

2. Circuit Short to Ground.

3. Circuit Short to Power Supply.

1. Solenoid Valve Circuit

2. Solenoid Valve

3. ECM

3. Schematic:

12

Main Relay

VVT  Solenoid

From Battery

Engine 

Control 

Module

FE02-5004b

4. Diagnostic Steps:

Note

Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.

Step 1

Measure VVT solenoid valve assembly resistance.

2-70

Control System JL4G18-D

Engine