Chery Tiggo. Manual — part 79

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

ECM TERMINAL NO.

ITEM

CONDITION

DATA (DC VOLTAGE)

12

Continuous Supply

Voltage

-

Voltage (11 - 14 V)

13

Ignition Switch

€ Ignition switch: ON

Voltage (11 - 14 V)

€ Ignition switch: OFF

Approximately 0 V

14

EMS Relay (Main Relay)

€ Ignition switch: OFF
€ More than a few
seconds after turning
ignition switch OFF

Voltage (11 - 14 V)

44

45

Switched Supply Voltage

(SSV)

€ Ignition switch: ON

Voltage (11 - 14 V)

63

DIAGNOSIS & TESTING

03

DIAGNOSIS & TESTING

LTSMW030043T

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

ECM TERMINAL NO.

ITEM

CONDITION

DATA (DC VOLTAGE)

3

GND (IGN)

Ignition switch: ON

Approximately 0 V

51

GND (Signal)

Ignition switch: ON

Approximately 0 V

53

GND (Signal)

Ignition switch: ON

Approximately 0 V

61

GND (Power)

Ignition switch: ON

Approximately 0 V

80

GND (Power)

Ignition switch: ON

Approximately 0 V

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.

• Start the engine and warm it to normal operating temperature.

• With the scan tool, select view data stream.

• If the data stream is not detected, the condition is current. Go to Diagnostic Procedure - Step 1.

• If the data stream is detected, the condition is intermittent (See Diagnostic Help and Intermittent DTC Trouble-

shooting in Section 03 Electronic Engine Controls for more information).

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

Diagnostic Procedure

1.

PRELIMINARY INSPECTION

• Attempt to start the engine.

Does the engine start?

Yes

>>

Go to step 7.

No

>>

Go to step 2.

2.

CHECK ECM POWER SUPPLY CIRCUIT - (1)

• Turn ignition switch off and then on.

• Check voltage between the ECM terminal 13 and

ground.

• Battery voltage should exist.

Is the check result normal?

Yes

>>

Go to step 4.

No

>>

Go to step 3.

DIAGNOSIS & TESTING

LTSMD030061

03

3.

DETECT MALFUNCTIONING PART

• Check the following:

− Fuse 17
− Harness connectors C-103, E-103, terminal 14
− Front fuse and relay box connector A
− Harness for an open or short between ECM and fuse

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

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

4.

CHECK GROUND CONNECTIONS

• Turn ignition switch off.

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

trols).

• Inspect ground connections E-207 and E-208 mounting position (See Vehicle Wiring Harness Layout - Engine

Room Harness (With 1.6L/1.8L Engine) in Section 16 Wiring).

Are the ground connections OK?

Yes

>>

Go to the next step.

No

>>

Repair or replace ground connections.

5.

CHECK ECM GROUND CIRCUIT FOR AN OPEN OR SHORT

• Disconnect ECM harness connector.

• Check harness continuity between ECM terminals 3, 51, 53, 61, 80 and ground.

• Continuity should exist.

• Also check harness for short to power.

Is the check result normal?

Yes

>>

Go to step 7.

No

>>

Go to the next step.

6.

DETECT MALFUNCTIONING PART

• Check harness for open or short between ECM terminals 3, 51, 53, 61, 80 and ground.

Is the check result normal?

Yes

>>

Go to the next step.

No

>>

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

DIAGNOSIS & TESTING