Step 7

Check whether the intake manifold pressure sensor parameter respond to changes.

(a)

Engine Running

(b)

Change the throttle position, hold the throttle position,
observe intake manifold pressure sensor parameter value.
Whether the value rapidly changes with the throttle position
changes.

Does intake manifold pressure (MAP) sensor value rapidly change
with the throttle position changes?

Yes

Go to step 9

No

Step 8

Check the intake manifold pressure sensor installation port and vacuum tubes.

(a)

Check the intake manifold pressure sensor installation port
and vacuum tubes.

Are the installation port and vacuum tubes blocked?

Yes

Clean and service the intake manifold and
vacuum tubes.

No

Replace the intake manifold pressure sensor.

Step 9

Use scan tool to confirm whether the DTC code is stored again.

(a)

Connect scan tool to the datalink connector.

(b)

Turn the ignition switch to "ON" position.

(c)

Clear DTC code.

(d)

Start and run the engine at idle speed to warm up the engine
for at least 5 min.

(e)

Read control system DTC code again to confirm that the
system has no DTC code.

Yes

Diagnostic

No

Step 10

Check ECM power supply circuit.

(a)

Check whether ECM power supply circuit is normal.

(b)

Check whether ECM ground circuit is normal.

No

Repair the faulty part.

Yes

Step 11

Replace ECM.

(a)

Replace ECM.

(b)

Carry out crankshaft position sensor self learn. Refer to

2.12.7.11

 

Crankshaft Position Sensor (CKP) Learn

.

Engine

Control System JL4G15-D

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Next

Step 12

Use scan tool to confirm whether the DTC code is stored again.

(a)

Connect scan tool to the datalink connector.

(b)

Turn the ignition switch to "ON" position.

(c)

Clear DTC code.

(d)

Start and run the engine at idle speed to warm up the engine
for at least 5 min.

(e)

Read control system DTC code again to confirm that the
system has no DTC code.

No

Intermittent Fault. Refer to 

2.2.7.3

 

Intermittent

Fault Check

Yes

Step 13

Diagnostic completed.

5. Repair Instructions:

Replace intake pressure / temperature sensor. Refer to 

2.2.8.7

 

Intake Air Pressure and Temperature Sensor Replacement

.

Refer to 

2.2.8.8

 

Engine Control Module Replacement

Replace ECM.

2.12.7.17 DTC P0076 P0077

1. DTC Descriptor:

DTC

P0076

Intake VCP Hydraulic Control Valve Coil Low Voltage or Open Circuit

DTC

P0077

Intake VCP Hydraulic Control Valve Coil High Voltage

Intake camshaft position (CMP) actuator is connected to the intake camshaft and operated by the hydraulic pressure, which is
provided by the oil pump in order to change the intake camshaft to the CKP (CKP) relative angle. Intake VVT solenoid valve power
is provided from the main relay. ECM controls ground with a pulse-width modulation signal to control the engine oil flow to the
camshaft position actuator. Oil pressure moves a security slide valve within the camshaft position actuator body at the front of the
camshaft. When the safety slide valve moves, the oil is imported to the camshaft position actuator to rotate the camshaft. The intake
camshaft camshaft actuator change the camshaft working angle up to 50 degrees.

ECM controls the solenoid valve internal ground through ECM harness connector EN01 terminal No.2. There is a feedback circuit
within ECM. Engine ECM monitors feedback signals to determine whether the control circuit is open, short to ground or short to
voltage. If ECM detects the control circuit voltage is within the specified range when the control circuit is instructed to disconnect, it
will set this DTC code.

2. Conditions For Setting DTC and The Fault Location:

DTC

Code

DTC Detection Strategy

Conditions For Setting The DTC (Control Strategy)

Fault Locations

P0076
P0077

Hardware Circuit Checks

1. Circuit Open

2. Circuit Short To Power Supply

3. Circuit Short To Ground

1. Solenoid Valve

Circuit

2. Solenoid Valve

3. ECM

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Control System JL4G15-D

Engine

3. Schematic:

12

Main Relay

From Battery

VVT Solenoid

Engine 

Control 

Module

FE02-5204b

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 resistance.

VVT Solenoid

FE02-5005b

(a)

Disconnect VVT solenoid valve wiring harness connector
EN10.

(b)

Measure resistance between the two VVT solenoid valve
terminals.

Standard Resistance: 9.4-10.6 Ω at 20°C(68 ºF)

(c)

Connect VVT solenoid valve wiring harness connector.

No

Replace VVT solenoid valve. Go to step 7

Engine

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Yes

Step 2

Measure VVT solenoid valve working power supply.

1

2

VVT Solenoid Harness Connector EO10

FE02-5230b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect VVT solenoid valve wiring harness connector
EO10.

(c)

Turn the ignition switch to "ON" position.

(d)

Test EO10 connector terminal No.1 with a multimeter.

Standard Voltage: 11-14 V

(e)

Connect VVT solenoid valve wiring harness connector E010.

Results:

No

Check whether circuit between EN10
solenoid valve wiring harness connector
terminal No.1 and main relay terminal No.3 is
open or short to ground.

Yes

Step 3

Check VVT solenoid valve control circuit.

1

2

1

17

33

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

VVT Solenoid Harness Connector EO10

ECM Harness Connector EO01

FE02-5231b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect VVT solenoid valve wiring harness connector
EO10.

(c)

Disconnect ECM harness connector EO01.

(d)

Measure resistance between VVT solenoid valve wiring
harness connector EO10 terminal No.2 and ECM harness
connector EO01 terminal No.2 with a multimeter. the
Standard Value is in the table below.

(e)

Measure resistance between VVT solenoid valve wiring
harness connector EO10 terminal No.2 and a reliable ground
with a multimeter. the Standard Value is in the table below.

(f)

Turn the ignition switch to "ON" position, (Note: At this point
EO01, EO10 connectors must be disconnected) Measure
voltage between VVT solenoid valve wiring harness
connector EO10 terminal No.2 and a reliable ground with a
multimeter. the Standard Value is in the table below.

Test Connection

Standard Value

Resistance Between EO10
(2) and EO01 (2)

Less than 1 Ω

Resistance Between EO10
(2) and Ground

10 kΩ or higher

Voltage Between EO10 (2)
and Ground

Less than 0 V

No

Repair or replace wiring harness connectors.

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Control System JL4G15-D

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