Geely EC718, EC718RV, EC715, EC715RV. Manual part — 183
Geely EC718, EC718RV, EC715, EC715RV. Manual part - 183
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
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
Crankshaft Position Sensor (CKP) Learn
Engine
Control System JL4G15-D
2-647
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
Yes
Step 13
Diagnostic completed.
5. Repair Instructions:
Replace intake pressure / temperature sensor. Refer to
Intake Air Pressure and Temperature Sensor Replacement
Engine Control Module Replacement
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
2-648
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
Control System JL4G15-D
2-649
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.
2-650
Control System JL4G15-D
Engine
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