Geely Emgrand X7. Manual part — 61

Refer to Fuel System in the2.3.7.3 Fuel Pressure Testing Procedure, and is fuel pressure normal?

(a) Inspect

intake

air

pressure sensor data.

(b) Inspect engine coolant temperature sensor data.

(c) Inspect

throttle position sensor.

Are these components normal?

Step 15

Inspect the ECM Power Supply Circuits.

(a) Inspect whether ECM power supply circuit is normal.

(b) Inspect whether ECM ground circuit is normal.

Step 16

Replace ECM

Refer to 2.2.7.11 Crankshaft Position Sensor (CKP) Learn to carry out the crankshaft position
sensor learn after replacing the ECM.

Step 17

Use a fault diagnosis tester to confirm whether the DTC Code is stored again.

(a) Connect fault diagnosis tester to the diagnostic interface.

(b) Turn 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) Road test the vehicle for at least 10 min.

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

Step 13

Inspect the fuel pressure

Step 14

Inspect whether the data in the data flow table is normal.

Next

No

Repair the faulty part.

Yes

No

Replace the damaged components. Go to
step 17.

Yes

No

Check fuel system: fuel pump, fuel filter, fuel pipe
circuit and fuel pressure regulator. Go to step 17

Yes

No

Adjust the valve timing. Go to step 17.

Yes

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Step 18

Troubleshooting

5. Maintenance

guide

:

Refer to 2.10.7.4 Replacement of Spark Plug to replace the spark plug.

No

Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

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2.2.7.34 DTC P0324, P0325

1. DTC

description:

DTC P0324

Knock Control System Fault

DTC P0325

Knock Sensor Fault

KS sensor to ECM feedback signal helps ECM control the ignition timing to achieve the optimal
operation and the ignition system to achieve the best performance, as well as to prevent damage to
the engine by a potential knock. KS sensor is located below the intake manifold on the cylinder.
KS sensor voltage changes with the AC signal generated by the vibration with running engine.
Engine control module adjusts spark timing according to KS sensor signal amplitude and
frequency.

ECM receives signals from KS sensor harness connector EM06 terminal No.1 and 2 through ECM
harness connector EM01 terminal No.36 and 37.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

P0324

Knock Control
System Fault

1. Engine speed is higher

than 1,600 rpm.

2. Certain

Load

Conditions.

3. Any section of the sensor

signal circuit is short to
ground.

P0325

Knock Sensor
Fault

1. Engine speed is higher

than 1,600 rpm.

2. Certain

Load

Conditions.

3. Sensor Signal Circuit

Open.

1. Sensor

Circuit

2. Sensor

3. ECM.

245

3. Circuit

sketch

发

动

机
控

制

模
块

EM01

37

36

EM01 KNOCK HI

KNOCK LO

1

2

爆震传感器

NL02-0050c

4. Diagnostic

Steps:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and
analyze the accuracy of the data, as these will help with quick diagnosis.

Step 1

Initial Inspection

(a) Inspect whether there is KS sensor physical damage.

(b) Inspect whether KS sensor is installed correctly. Torque is set too tight or too loose will

trigger DTC codes.

(c) Check KS sensor installation surface whether there are glitches, casting flash and foreign

matter.

(d) Knock sensor must be kept away from hoses, brackets and engine wires.

Are these components normal?

Step 2

Read the engine data (engine speed) on the fault diagnosis tester.

(a) Connect fault diagnosis tester to diagnostic interface.

(b) Turn ignition switch to ON position.

(c) Select Engine/Read Data/Knock Sensor Signal 1.

(d) Start and run the engine at normal working temperature.

(e) Road test the vehicle and read the engine speed data on the fault diagnosis tester.

Is the data normal?

No

Repair the faulty part. Go to step 9

Yes

Knock sensor

Engi

ne

co

ntr

ol mo

dul

e

246