Chery T21 2014 Service Manual page 887

DTC Code DTC Definition
Output Speed Sensor
P0720
Circuit
Second Speed Sensor
P1745
Plausible
DTC Confirmation Procedure:
Confirm that battery voltage is between 11 and 14 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), and make it
communicate with vehicle electronic module by the data network.
 Turn ignition switch to ON.
 Using X-431 3G diagnostic tester to record and clear the DTCs stored in the TCU.
 Turn ignition switch to LOCK and wait for a few seconds.
 Turn ignition switch to ON, and then 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.
Diagnosis Procedure
HINT:
After the fault is eliminated, verify DTC and symptom again.
1
Check wire harness connector
a. Turn ignition switch to LOCK.
b. Disconnect the secondary speed sensor connector.
c. Check if the secondary speed sensor connector is dirty, oxidized, loose or damaged.
Repair fault
NG
Chery Automobile Co., Ltd.
DTC Detection
Condition
Start engine and keep
it at following status for Output speed
at least 1 min: throttle signal is higher
opening not less than than the
10%, at D gear, engine allowable value
speed higher than 800 within a period
rpm
Difference
Start engine and keep between output
it at following status for speed after
at least 30 seconds: conversing
throttle opening higher vehicle speed
than 10%, at D gear, signal and actual
vehicle speed higher measured speed
than 10 km/h is higher than
limit
18 - QR019CHB CVT
DTC Set
Possible Cause
Condition
 Incorrect
installation of the
output speed
sensor
 Signal circuit open
or short circuit
 Output speed
sensor power
circuit poor contact
 Output speed
sensor failure
 TCU signal circuit
failure
18
OK
53
18–