Geely Emgrand X7. Manual part — 206

(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 18

Troubleshooting

5. Maintenance

guide:

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

Step 17

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

No

Refer to 2.12.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

Next

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2.12.7.34 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 EN08 terminal No.1 and 2 through ECM
harness connector EN01 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.

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3. Circuit

sketch

NL02-2101b

36

EN01

1

EN08

2

EN08

37

EN01

爆震传感器

ECM

KNOCK HI

KNOCK LO

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?

(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.

Step 2

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

No

Repair the faulty part. Go to step 9

Yes

Knock sensor

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

Is the data normal?

Standard Value: Normal data. Refer to 2.12.7.9 Data Flow Table

Step 3

Refer to 2.12.7.4 Fault Symptom Table for intermittent fault.

Step 4

Inspect Knock Sensor

(a) Rotated ignition switch to OFF position .

(b) Disconnect Knock Sensor harness connector EN08.

(c) Measure knock sensor resistance.

Standard Resistance:

It is above 1MΩ with 1MΩ

(d)Connect Knock Sensor harness connector EN08.

Is the resistance normal?

Step 5

Inspect sensor terminal No.1 circuit.

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect Knock Sensor
harness connector EN08.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between

knock sensor harness connector
EN08 terminal No.1 and ECM
harness connector EN01 terminal
No.36. Inspect whether the
circuit is open.

NL02-2102b

1

2

EN08 爆震传感器线束连接器

1

No

Refer to 2.10.7.5 “Replacement of Knock Sensor”
to replace the knock sensor. Go to Step 9.

Yes

No

Go to step 4

Yes

EN08 knock sensor harness connector

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