Chery Tiggo 5 (T21). Service manual — part 70
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DTC Confirmation Procedure
Confirm that battery voltage is over 12 V before performing the following procedures.
Turn ignition switch to LOCK.
Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC).
Turn ignition switch to ON.
Use X-431 3G diagnostic tester to record and clear the DTCs stored in the ECM.
Start the engine and warm it up to normal operating temperature, and then select Read Code.
If the DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis
procedure - Step 1.
If DTC is not detected, the malfunction indicated by the DTC is intermittent (
).
Diagnosis Procedure
a. Connect X-431 3G diagnostic tester to Data Link Connector (DLC).
b. Turn ignition switch to ON. Start the engine and warm it up to normal operating temperature, and then
select Read Code.
DTC
P0420-00 Catalyst System, Bank1 Efficiency Below Threshold
DTC Code
DTC Definitions
DTC Detection
Conditions
Possible Cause
P0420-00
Catalyst System,
Bank1 Efficiency
Below Threshold
Engine running
Three-way catalytic converter
Leakage in exhaust system
Upstream oxygen sensor
Downstream oxygen sensor
ECM
1
Check for any other DTCs output (in addition to DTC P0420-00)
Display (DTC Output)
Proceed to
DTC P0420-00
A
DTC P0420-00 and other DTCs
B
Go to DTC chart, and perform
troubleshooting for other DTCs first
B
A
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a. Read datastream using diagnostic tester.
b. Check datastream below.
a. Turn ignition switch to ON and start the engine.
b. Check exhaust system for leakage.
2
Read datastream
Item
OK (Idling)
If it is NG, proceed to
Upstream Oxygen Sensor Voltage
Quickly fluctuates between 0.1 to
0.9 V
A
Downstream Oxygen Sensor
Voltage
Fluctuates slightly at about 0.45 V
B
Average Injection Pulse Width
1.5 - 2.9 ms
C
Replace upstream oxygen sensor
A
Check injector, fuel pressure and other
causes for abnormal injection pulse width
3
Check exhaust system
C
B
Repair or replace related exhaust system
components
NG
4
Check downstream oxygen sensor
OK
Replace downstream oxygen sensor
NG
Replace three-way catalytic converter, and go to step 5
OK
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a. Use X-431 3G diagnostic tester to read the ECM DTC.
b. Refer to "DTC Confirmation Procedure".
c. Check if DTC P0420-00 still exists.
5
Check for DTCs
Replace ECM
NG
System is operating normally.
Reassemble vehicle and perform a road test to confirm that malfunction reported by customer has
been repaired.
OK
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SQR484F ENGINE MANAGEMENT SYSTEM
DTC
P0444-00
Evaporative Emiss. System Purge Control Valve Circ.
Open
DTC
P0458-00
Evaporative Emission System Purge Control Valve
Circuit Low
DTC
P0459-00
Evaporative Emission System Purge Control Valve
Circuit High
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