check engine CHERY TIGGO 2009 Service Repair Manual

Downloaded from www.Manualslib.com manuals search engine ECM Power Supply and Ground Circuit Test
Power Supply And Ground Circuit Diagnostic Check
DIAGNOSIS & TESTING
LTSMW030003T
03–462Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Check reference values between ECM terminals and ground under the following conditions:
TERMINAL NO.ITEMCONDITIONDATA (DC VOLTAGE)
12 Power supply for ECM Ignition switch: ON Battery Voltage (11 - 14 V)
25
34 ECM relayIgnition switch: OFF
More than a few seconds
after turning ignition switch OFF Battery Voltage (11 - 14 V)
64 Battery All timeBattery Voltage (11 - 14 V)
66 Ignition switch Ignition switch: ON Battery Voltage (11 - 14 V)
Ignition switch: OFF Approximately 0 V
DIAGNOSIS & TESTING
03
03–463Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine Specification data are reference values and are measured between each terminal and ground.
TERMINAL NO.ITEMCONDITIONDATA (DC VOLTAGE)
13 ECM ground Ignition switch: ON Approximately 0 V
26 ECM ground 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 Diagnosis & Testing Diagnostic Help in Section
03 Electronic Engine Controls).
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
Diagnostic Procedure
1.INSPECTION START
• Start engine.
Is engine running?
Ye s>>Go to step 8.
No
>>Go to step 2.
2.CHECK ECM POWER SUPPLY CIRCUIT - (1)
• Turn ignition switch OFF and then ON position.
• Check voltage between ECM terminal 66 and
ground.
• Battery voltage should exist.
Is the check result normal?
Ye s>>Go to step 5.
No
>>Go to step 3.
DIAGNOSIS & TESTING
LTSMD030074
03
03–465Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 3.DETECT MALFUNCTIONING PART
• Check the following:
Fuse 17
Harness connectors C-103, E-103, terminal 1
Front fuse and relay box connector A
Harness open or short between ECM and fuse
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair or replace malfunctioning parts.
4.CHECK ECM POWER SUPPLY CIRCUIT - (2)
• Check voltage between ECM terminal 64 and ground.
• Battery voltage should exist.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Check the following:
Harness connectors A-102, E-105, terminal 4
Front fuse and relay box connector A
Harness open or short between ECM and battery
5.CHECK GROUND CONNECTIONS
• Turn ignition switch off.
• Loosen and retighten ground screws on the body.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair or replace ground connections.
6.CHECK ECM GROUND CIRCUIT FOR AN OPEN OR SHORT
• Disconnect ECM harness connector.
• Check harness continuity between ECM terminals 13, 26 and ground.
• Continuity should exist.
• Also check harness for short to power.
Is the check result normal?
Ye s>>Go to step 8.
No
>>Go to the next step.
7.DETECT MALFUNCTIONING PART
• Check harness for open or short between ECM terminals 13, 26 and ground.
• Repair open circuit or short to power in harness or connectors.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair circuit for an open or short to power in harness or connectors.
DIAGNOSIS & TESTING
03–466Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 8.CHECK ECM POWER SUPPLY CIRCUIT - (3)
• Turn ignition switch on and then off.
• Check voltage between ECM terminals

12, 25 and ground.
• Voltage: Turn ignition switch on battery voltage will be exist and after turning ignition switch off, battery voltage
will exist a few seconds, then

drop to approximately 0 V.
Is the check result normal?
Ye s>>Check the starting system.
No
>>Go to the next step.
9.CHECK STARTER RELAY SUPPLY VOLTAGE
• Turn ignition switch off. Wait for at least 10 seconds.
• Check voltage between ECM terminal 34 and ground.
• Battery voltage should exist.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Go to step 11.
10.CHECK ECM POWER SUPPLY CIRCUIT - (4)
• Disconnect ECM harness connector.
• Disconnect front fuse and relay box harness connector F.
• Check harness continuity between ECM terminals 12, 25 and front fuse and relay box terminal F3.
• Continuity should exist.
• Also check harness for short to ground and short to power.
Is the check result normal?
Ye s>>Go to step 12.
No
>>Repair circuit for an open or short in harness or connectors.
11 .CHECK STARTER RELAY CIRCUIT
• Disconnect ECM harness connector.
• Disconnect front fuse and relay box harness connector A, G.
• Check harness continuity between ECM terminal 34 and front fuse and relay box terminal A1.
• Check harness continuity between front fuse and relay box terminal A1 and G5,
• Check harness continuity between front fuse and relay box terminal A13 and G5,
• Continuity should exist.
• Also check harness for short to ground and short to power.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair circuit for an open or short to ground or short to power in harness or connectors.
DIAGNOSIS & TESTING
03
03–467Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 12.CHECK FUSE
• Disconnect fuse 12 (30A), fuse 24 (5A), fuse 25 (10A), front fuse and relay box.
• Check fuse.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Replace fuse 12, 23, 24.
13.CHECK FRONT FUSE AND RELAY BOX
• Check front fuse and relay box.
• Check harness continuity between front fuse and relay box and battery.
Is the check result normal?
Ye s>>Replace the ECM.
No
>>Replace or repair front fuse and relay box or harness.
DIAGNOSIS & TESTING
03–468Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 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 B-201 (See Vehicle Wiring Harness Layout - Body Harness in Section 16 Wir-
ing).
• Inspect the ground connection E-208 (See Vehicle Wiring Harness Layout - Engine Control Harness (With MIT-
SUBISHI 2.4L Engine) in Section 16 Wiring).
Are the ground connections OK?
Ye s>>Go to the next step.
No
>>Repair or replace the ground connection.
2.CHECK UPSTREAM O2SENSOR ELECTRICAL CONNECTOR
• Disconnect the upstream O
2sensor (1) electrical
connector.
• Inspect the electrical connector for damage.
Is the electrical connector OK?
Ye s>>Go to the next step.
No
>>Repair or replace the electrical connector
as necessary.
3.CHECK DOWNSTREAM O2SENSOR ELECTRICAL CONNECTOR
• Disconnect the downstream O
2sensor (2) electrical
connector.
• Inspect the electrical connector for damage.
Is the electrical connector OK?
Ye s>>Go to the next step.
No
>>Repair or replace the electrical connector
as necessary.
DIAGNOSIS & TESTING
LTSM030004
VISMD030204
03–472Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 4.CHECK THE O2SENSOR GROUND CIRCUIT FOR AN OPEN OR SHORT
• Disconnect ECM harness connector.
• Check harness continuity between upstream O
2sensor terminal 1 in connector E-074 and ECM terminal 76 in
connector E-054.
• Check harness continuity between downstream O
2sensor terminal 1 in connector B-011 and ground.
• Continuity should exist.
• Check harness for a short to power and short to ground.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair the circuits for an open or short to power or short to ground in harness or connectors.
5.CHECK THE O2SENSOR INPUT SIGNAL CIRCUIT FOR AN OPEN OR SHORT
• Check harness continuity between ECM terminal and O
2sensor terminal as follows.
• Continuity should exist.
• Check harness continuity between following terminals and ground.
• Continuity should not exist.
COMPONENT ECM TERMINALO2SENSOR TERMINAL
Upstream O
2sensor 60 4
Downstream O
2sensor 59 4
• Also Check harness short to power supply circuit.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair circuit for an open or short to power or short to ground in harness or connectors.
6.CHECK O2SENSOR POWER SUPPLY
• Turn ignition switch on.
• Check power supply between O
2sensor E-074, ter-
minal 2 and ground.
• Battery voltage should exist.
Is the check result normal?
Ye s>>Go to step 8.
No
>>Go to the next step.
DIAGNOSIS & TESTING
LTSMD030002
03
03–473Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 7.DETECT MALFUNCTIONING PART
• Check the following:
Fuse 25, Fuse 12, Fuse 24
Front fuse and relay box H5
Harness connectors A-102, E-105
Harness open or short between O
2sensor and fuse
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair or replace malfunctioning parts.
8.CHECK O2SENSOR HEATER CONTROL CIRCUIT FOR AN OPEN AND SHORT
• Turn ignition switch off.
• Check harness continuity between ECM terminal and O
2sensor terminal.
COMPONENTS ECMO2SENSOR
TERMINAL 523
• Continuity should exist.
• Check harness short to power supply circuit and ground.
Is the check result normal?
Ye s>>Go to the next step.
No
>>Repair the circuit for an open or short to power supply circuit or ground in harness or connectors.
9.CHECK O2SENSOR HEATER
• Check resistance between O
2sensor terminals.
TERMINAL NO. RESISTANCE
2 & 3 (including cable and
connector) Approximately 9

1&2and1&3 (Continuity should notexist)
4&2and4&3
Is the check result normal?
Ye s>>Go to the next step.
No
>>Replace O2sensor.
DIAGNOSIS & TESTING
03–474Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 10. CHECK O2SENSOR
• Connect O
2sensor connector.
• Connect ECM connector.
• If with the X-431, reference data stream value.
• If without the X-431, as following.
Start engine and warm it up to normal operating temperature.
Turn ignition switch off.
Start engine and keep the engine speed between 3.500 and 4,000 RPM for at least 1 minute.
Let engine idle for 1 minute.
Set digital multimeter probes between ECM terminal 60 and ground.
CHECK ITEM CHECK CONTENT NORMAL VALUE
Oxygen sensor •
Warm-up condition
• Become lean while
decelerate Decelerate from 4,000
RPM suddenly below 200 mV
• Warm-up condition
• Become rich while
accelerate Accelerate suddenly
600 - 1,000 mV
• Warm-up condition
• Check with O
2sensor
signal Idle
100 - 900 mV
2500 RPM 600 - 1,000 mV
Is the check result normal?
Ye s>>Go to the next step.
No
>>Replace O2sensor.
11 . CHECK DTC
• With the X-431 scan tool, read ECM DTCs.
• Refer to DTC Confirmation Procedure.
Is DTC 11 still present?
Ye s>>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
03
03–475Chery Automobile Co., Ltd.