Chery Tiggo. Manual — part 140
Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
ITEM
CONDITION
DATA (DC VOLTAGE)
18
Upstream oxygen sensor
• Engine is running
• Warm-up condition
• Keep the engine speed
2000 RPM
Approximately 0.1 - 0.9 V
(change 5 - 8 times in 10
seconds periodically)
28
Downstream oxygen
sensor heating
-
-
36
Sensor (GND)
• Warm-up condition
• Idle speed
Approximately 0 V
48
Upstream oxygen sensor
heating
-
-
55
Downstream oxygen
sensor
• Engine is running
• Warm-up condition
• Keep the engine speed
2000 RPM
Approximately 100 mV
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
DTC DEFINITION
DTC DETECTION
CONDITION
POSSIBLE CAUSE
P0031
O
2
sensor 1 heater control
circuit low
Engine is running
• Fuel quality
• Upstream O
2
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 and record and erase DTC.
• Start engine and warm it up to the normal operating temperature.
• Turn ignition switch off and wait at least 10 seconds.
• Start engine and keep the engine speed 2000 RPM for at least 1 minute.
• Let engine idle for 2 minutes, select view DTC and data stream.
• If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou-
bleshooting 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.
DIAGNOSIS & TESTING
03
Diagnostic Procedure
1.
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-20 7 and E-208 mounting position (See Vehicle Wiring Harness Layout - Engine
Room Harness (With 2.0L Engine) in Section 16 Wiring).
Are the ground connections OK?
Yes
>>
Go to the next step.
No
>>
Repair or replace ground harness or connections.
2.
CHECK UPSTREAM O
2
SENSOR ELECTRICAL CONNECTOR
• Disconnect the upstream O
2
sensor (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.
3.
CHECK UPSTREAM O
2
SENSOR POWER SUPPLY CIRCUIT
• Turn ignition switch on.
• Check supply voltage between O
2
sensor terminal
2 and ground in the O
2
sensor electrical connector
E-005.
• Battery voltage should exist.
Is the check result normal?
Yes
>>
Go to Step 5.
No
>>
Go to the next step.
DIAGNOSIS & TESTING
BESM030017
LTSMD030029
4.
DETECT MALFUNCTIONING PART
• Check the following:
− Harness connectors A-102, E-105
− Front fuse and relay box H2, H5
− Fuse 25, fuse 12, fuse 23, fuse 24
• Check harness for an open or short between O
2
sensor and fuse.
• Repair or replace malfunctioning part.
• With the X-431, select view DTC.
Is DTC P0031 still present?
Yes
>>
Go to the next step.
No
>>
The system is normal now.
5.
CHECK O
2
SENSOR HEATER CONTROL CIRCUIT FOR OPEN OR SHORT
• Turn ignition switch off.
• Disconnect ECM connector.
• Check harness continuity between ECM terminal and O
2
sensor terminal.
COMPONENT
ECM
UPSTREAM O
2
SENSOR
TERMINAL
• 48 (With EOBD)
• 1 (Without EOBD)
1
• Continuity should exist.
• Check harness for short to ground.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair the circuit for an open or short in harness or connectors.
6.
CHECK O
2
SENSOR HEATER
• Check resistance between O
2
sensor heater terminals.
TERMINAL NO.
RESISTANCE
1 and 2 (including cable
and connector)
Approximately 9
⍀
DIAGNOSIS & TESTING
03
• Check resistance between O
2
sensor terminals.
TERMINAL NO.
RESISTANCE
1 & 3 and 1 & 4
⬁ ⍀ (Continuity
should not exist)
4 & 1 and 4 & 2
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace O
2
sensor.
7.
CHECK DTC
• With the X-431 scan tool, read ECM DTCs.
• Refer to ⬙DTC Confirmation Procedure⬙.
Is DTC P0031 still present?
Yes
>>
Replace the ECM.
NOTE : The Immobilizer control module must be matched to the new ECM (See ECM Removal & Instal-
lation in Section 03 Electronic Engine Controls).
No
>>
The system is now operating properly.
Reassemble the vehicle and road test to verify the customers complaint is repaired.
DIAGNOSIS & TESTING
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