Chery Tiggo. Manual — part 200

• Continuity should exist.

• Also check harness for short to power and short to ground.

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

Repair or replace circuit for an open or short to power or short to ground in harness or connectors.

4.

CHECK ATMOSPHERE PRESSURE SENSOR SIGNAL CIRCUIT

• Check harness continuity between ECM terminal 69 and atmosphere pressure sensor terminal 2.

• Continuity should exist.

• Also check harness for short to power and short to ground.

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

Repair or replace harness or connectors.

5.

CHECK ATMOSPHERE PRESSURE SENSOR

• Connect ECM connector.

• Connect atmosphere pressure sensor connector.
• With the X-431, select view data stream.

• Check sensor signal output.

TERMINAL NO.

ITEM

CONDITION

DATA (DC

VOLTAGE)

65

Regulated sensor

supply

Ignition switch: ON

-

4.8 - 5.2 V

69

Atmosphere

pressure sensor

• Sea level altitude:
0 M

3.7 - 4.3 V

(101 kPa)

• Sea level altitude:
600 M

95 kPa

• Sea level altitude:
1200 M

3.2 - 3.8 V

(88 kPa)

• Sea level altitude:
1800 M

81 kPa

76

Sensor (GND)

Ignition switch: ON

0 V

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

Replace atmosphere pressure sensor.

DIAGNOSIS & TESTING

LTSMD030070

03

6.

CHECK DTC

• With the X-431 scan tool, read ECM DTCs.

• Refer to ⬙DTC Confirmation Procedure⬙.

Is DTC 25 still present?

Yes

>>

Replace the ECM.

No

>>

The system is now operating properly.
Reassemble the vehicle and road test to verify the customers complaint is repaired.

DIAGNOSIS & TESTING

31 - Knock Sensor

DIAGNOSIS & TESTING

LTSMW030006T

03

Check reference values between ECM terminals and ground under the following conditions:

ECM TERMINAL NO.

ITEM

TEST METHOD

DATA (DC VOLTAGE)

62

Knock sensor

• Test Method 1: Knock at
cylinder with rubber
hammer

• Test Method 2: Knock at
sensor slightly

Output signal voltage

should exist.

On Board Diagnostic Logic
• Self-diagnosis detection logic.

DTC NO.

DTC DEFINITION

DTC DETECTION

CONDITION

POSSIBLE CAUSE

31

Knock sensor

An excessive voltage from

the sensor is sent to ECM.

• Knock sensor

• Harness or connectors

• ECM

DTC Confirmation Procedure:

Before performing the following procedure, confirm that battery voltage is more than 12 V.

• Turn ignition switch off.

• Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available.

• Turn ignition switch on.

• With the scan tool, record and erase stored DTCs in the ECM.

• Run engine for a while then select view DTC.

• If DTC is detected, go to Diagnostic Procedure - Step 1.

• If the DTC is not detected, the DTC condition is intermittent (See Diagnosis & Testing Diagnostic Help in Sec-

tion 03 Electronic Engine Controls).

NOTE :
Before performing the following procedure, make sure that the ECM ground connection is in good condition.

NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.

Diagnostic Procedure

1.

CHECK GROUND CONNECTION

• Turn ignition switch off.

• Loosen and retighten ground screws on the body (See Ground Inspection in Section 03 Electronic Engine Con-

trols).

• Inspect the ground connection E-208 (See Vehicle Wiring Harness Layout - Engine Room Harness (With Mit-

subishi 2.4L Engine) in Section 16 Wiring).

Is the ground connections OK?

Yes

>>

Go to the next step.

No

>>

Repair or replace ground connection.

DIAGNOSIS & TESTING