Chery T21 2014 Service Manual page 286

06 - SQR484F ENGINE MANAGEMENT SYSTEM
DTC P0420-00 Catalyst System, Bank1 Efficiency Below Threshold
DTC Code DTC Definitions
Catalyst System,
P0420-00 Bank1 Efficiency
Below Threshold
DTC Confirmation Procedure
Confirm that battery voltage is over 12 V before performing the following procedures.
06
 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
1
Check for any other DTCs output (in addition to DTC P0420-00)
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.
Display (DTC Output)
DTC P0420-00 and other DTCs
Go to DTC chart, and perform
B
troubleshooting for other DTCs first
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06–
DTC Detection
Engine running
DTC P0420-00
Conditions
 Three-way catalytic converter
 Leakage in exhaust system
 Upstream oxygen sensor
 Downstream oxygen sensor
 ECM
Chery Automobile Co., Ltd.
Possible Cause
(See page 06-18).
Proceed to
A
B
A