Chery A21 2005, Service Manual, Page: 357 / 475

CHERY
·
A21 SERVICE MANUAL ENGINE EFI SYSTEM
34
Yes
Repair or
replace
cable
5
Check if it is short circuit to ground between ECU pin
No. 17, No. 40 and sensor connector No.1, No.2
No Next step
Yes Diagnosis help
6
Start the engine at idle speed. Observe the value changes
of diagnostic tester
“
air intake temperature
”
, the value
should increase with the increase of the engine intake air.
No
Replace the
sensor
DTC: P0117 Temperature is much lower indicated by engine coolant temperature sensor.
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put
the ignition switch to
“
ON
”
.
Next step
Yes To step 6
2
Observe
“
coolant temperature
”
item in data flow, if
it is same temperature with engine temperature
(specific data is correlated to the engine temperature
at that time).
Notice: if the value always is - 40 there is perhaps
℃
open circuit failure in the circuit.
No Next
Yes Next step
3
Take off the joint of coolant temperature sensor on
the cable, check the resistance values using
multimeter between sensor connector No. 1 and No.
2 and check if it is corresponding to its temperature
(please reference the related section of this service
manual).
No Replace sensor
Yes To step 6
4
Take off the joint of coolant temperature sensor on
the cable, check the voltage between pin No.1 and
pin No.2 by multimeter and observe if it is around
5V.
No Next step
Yes
Repair or replace
cable 5
Check if it is open circuit or short circuit to power
supply between ECU pin No.39, No. 35 and sensor
connector No.1, No.2.
No Next step
Yes Diagnosis help
6
Start the engine at idle speed. Observe the value
changes of diagnostic tester
“
coolant temperature
”
,
the value should increase with the increase of the
engine coolant temperature.
No Replace sensor
DTC: P0118 Temperature is much higher indicated by engine coolant temperature sensor
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put
the ignition switch to
“
ON
”
.
Next step
Yes To step 6
2
Observe
“
coolant temperature
”
item in data flow, if
it is same temperature with engine temperature
(specific data is correlated to the engine temperature
No Next
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