Chery Tiggo. Manual — part 194

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.

2.

CHECK THROTTLE POSITION SENSOR (TPS) ELECTRICAL CONNECTOR

• Turn ignition switch off.

• Disconnect the TPS (1) electrical connector.

• Inspect the electrical connector for damage.

Is the electrical connector OK?

Yes

>>

Go to the next step.

No

>>

Repair or replace the electrical connector

as necessary.

DIAGNOSIS & TESTING

LTSM030027

03

3.

CHECK THE THROTTLE POSITION SENSOR (TPS) POWER SUPPLY CIRCUIT

• Turn ignition switch on.

• Check supply voltage between TPS terminal 1 and

ground in the TPS electrical connector E-076.

• 4.5 - 5.5 V should exist.

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

Repair the circuit for an open or short to
power supply or ground in harness or con-
nectors.
If the circuit is normal, go to the next
step.

4.

CHECK THE TPS SIGNAL CIRCUIT FOR AN OPEN OR SHORT

• Turn ignition switch off.

• Disconnect ECM harness connector.

• Check harness continuity between following terminals.

TPS TERMINAL

ECM TERMINAL

2

68

• 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 the circuit for an open or short to power or short to ground in harness or connectors.

5.

CHECK TPS IDLE SWITCH CIRCUIT FOR AN OPEN OR SHORT

• Check harness continuity between following terminals.

TPS TERMINAL

ECM TERMINAL

3

71

• Continuity should exist.

• Check harness for short to power or short to ground.

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

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

DIAGNOSIS & TESTING

LTSMD030010

6.

CHECK TPS GROUND CIRCUIT FOR AN OPEN OR SHORT

• Check harness continuity between following terminals.

TPS TERMINAL

ECM TERMINAL

4

76

• Continuity should exist.

• Check harness for short to power.

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

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

7.

CHECK THE TPS RESISTANCE

• Check the resistance between TPS terminal 1 and terminal 3.

• 28 - 33 ⍀ (20°C) should exist.

• Also check the resistance between TPS terminal 2 and terminal 4 while turn the throttle.

• The resistance should linear change.

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

Replace the TPS.

DIAGNOSIS & TESTING

03

8.

CHECK THE TPS SIGNAL

• Turn ignition switch off.

• Connect ECM connector.

• Connect TPS connector.

• Turn ignition switch on.

• Check voltage between TPS terminal 2 and terminal 3 and ground under the following conditions:

TERMINAL NO.

ITEM

CONDITION

DATA (DC

VOLTAGE)

65

Regulated sensor

supply

Ignition switch: ON

-

Approximately 5 V

68

Throttle Position

(TP) sensor

TP is in idle position

0.3 - 1.0 V

TP is fully opened

4.5 - 5.5 V

TP is open step by
step

Value is directly

proportional to TP
opening angle

71

Idle position switch

Adjust TP to idle

position

0 - 1 V

TP is ajar

Above 4 V

76

Sensor (GND)

-

Approximately 0 V

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

Replace the TPS.

9.

CHECK DTC

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

• Refer to ⬙DTC Confirmation Procedure⬙.

Is DTC 14 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