Chery T21 2014 Service Manual page 1347

DTC Confirmation Procedure
Confirm that the battery voltage is normal 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 ON.
 Using X-431 3G diagnostic tester to record and clear the DTCs stored in the A/C control module assembly.
 Turn ignition switch to LOCK and wait for a few seconds.
 Using X-431 3G diagnostic tester to select "Read Code".
 If 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. Please refer to Intermittent
DTC Troubleshooting.
Intermittent DTC Troubleshooting
If the malfunction is intermittent, perform the followings:
 Check if connectors are loose.
 Check if wire harnesses are worn, pierced, pinched or partially broken.
 Wiggle related wire harnesses and connectors and observe if signal is interrupted in the related circuit.
 If possible, try to duplicate the conditions under which the DTC was set.
 Look for the data that has changed or the DTC to be reset during the wiggle test.
 Look for broken, bent, protruded or corroded terminals.
 Inspect the A/C system sensors and mounting areas for damage, foreign matter, etc. that will cause
incorrect signals.
 Check and clean all wire harness connectors and grounding parts related to the current DTC.
 Remove the A/C control panel assembly from the malfunctioning vehicle and install it to a new vehicle and
perform a test. If DTC cannot be cleared, the A/C control panel assembly is malfunctioning. If DTC can be
cleared, reinstall the A/C control panel assembly to original vehicle.
 If multiple trouble codes were set, refer to the circuit diagrams to look for any common ground circuit or
power supply circuit applied to the DTC.
 Refer to Technical Bulletin that is applied to the malfunction.
Ground Inspection
Groundings are very important to the proper operation of circuits. Ground points are often exposed to
moisture, dirt and other corrosive environments. Corrosion (rust) can increase load resistance. This situation
may change the way in which a circuit works.
Circuits are very sensitive to proper grounding. A loose or corroded ground may seriously affect the control
circuit. The operations to check the ground points are as follows:
1. Remove the ground bolt or nut.
2. Check all contact surfaces for tarnish, dirt, rust, etc.
3. Clean as necessary to ensure that contacting is in a good condition.
4. Reinstall the ground bolt or nut securely.
5. Check if add-on accessories interfere with the ground circuit.
6. If several wire harnesses are crimped into one ground terminal, check if they are installed correctly. Make
sure all wire harnesses are clean, securely fastened and providing a good ground path.
Chery Automobile Co., Ltd.
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