Chery Tiggo. Manual — part 190
4.
CHECK THE O
2
SENSOR GROUND CIRCUIT FOR AN OPEN OR SHORT
• Disconnect ECM harness connector.
• Check harness continuity between upstream O
2
sensor terminal 1 in connector E-074 and ECM terminal 76 in
connector E-054.
• Check harness continuity between downstream O
2
sensor 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?
Yes
>>
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 O
2
SENSOR INPUT SIGNAL CIRCUIT FOR AN OPEN OR SHORT
• Check harness continuity between ECM terminal and O
2
sensor terminal as follows.
• Continuity should exist.
• Check harness continuity between following terminals and ground.
• Continuity should not exist.
COMPONENT
ECM TERMINAL
O
2
SENSOR TERMINAL
Upstream O
2
sensor
60
4
Downstream O
2
sensor
59
4
• Also Check harness short to power supply circuit.
Is the check result normal?
Yes
>>
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 O
2
SENSOR POWER SUPPLY
• Turn ignition switch on.
• Check power supply between O
2
sensor E-074, ter-
minal 2 and ground.
• Battery voltage should exist.
Is the check result normal?
Yes
>>
Go to step 8.
No
>>
Go to the next step.
DIAGNOSIS & TESTING
LTSMD030002
03
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
2
sensor and fuse
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace malfunctioning parts.
8.
CHECK O
2
SENSOR HEATER CONTROL CIRCUIT FOR AN OPEN AND SHORT
• Turn ignition switch off.
• Check harness continuity between ECM terminal and O
2
sensor terminal.
COMPONENTS
ECM
O
2
SENSOR
TERMINAL
52
3
• Continuity should exist.
• Check harness short to power supply circuit and ground.
Is the check result normal?
Yes
>>
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 O
2
SENSOR HEATER
• Check resistance between O
2
sensor terminals.
TERMINAL NO.
RESISTANCE
2 & 3 (including cable and
connector)
Approximately 9
⍀
1 & 2 and 1 & 3
⬁ ⍀ (Continuity should not
exist)
4 & 2 and 4 & 3
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace O
2
sensor.
DIAGNOSIS & TESTING
10.
CHECK O
2
SENSOR
• Connect O
2
sensor 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
2
sensor
signal
Idle
100 - 900 mV
2500 RPM
600 - 1,000 mV
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace O
2
sensor.
11.
CHECK DTC
• With the X-431 scan tool, read ECM DTCs.
• Refer to ⬙DTC Confirmation Procedure⬙.
Is DTC 11 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
03
12 - Air Flow Sensor
DIAGNOSIS & TESTING
LTSMW030013T
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