Maintenance Manual for Chery·Windcloud Marelli EFI System
Failure: too low circuit voltage of intake pressure sensor
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “ON”.
Go to next step
Yes Go to Step 5
2
Check Intake Pressure in data stream to see if it is
around 101kpa (specific value is related to site
elevation and air pressure).
No Go to next step
Yes Go to Step 5
3
Unplug intake pressure sensor connector from wire
harness and check the voltage between Pin 3 and
Pin 1 (i.e. between reference power supply and
signal grounding) of the connector to see if it is
around 5V.
No Go to next step
Yes
Repair or
replace wire
harness
4
Check respectively connections between Pin 54 of
ECU and Pin 1 of sensor connector, Pin 75 of ECU
and Pin 3 of sensor connector, Pin 68 of ECU and
Pin 4 of sensor connector to see if short circuit
occurs.
No Go to next step
Yes
Diagnosis
Instruction
5
Start engine and idle it. Slowly step down
accelerating pedal to dead position and observe
value of Intake Pressure on scanner, and it does not
vary much; quickly step down accelerating pedal to
dead position, the instant increase of value of Intake
Pressure reaches 90kpa or more.
No Replace sensor
Yes
Diagnosis
Instruction
6
Start engine and idle it. Observe value of Coolant
Temperature, it increases along with coolant
temperature.
No Replace sensor
Failure: too high indication of engine coolant temperature sensor
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “ON”.
Go to next step
Yes Go to Step 6
2
Check Coolant Temperature in data stream to see if
it is equivalent to engine temperature (specific value
is related to engine temperature at that very
moment)
Note: -40℃ value shown constantly may indicate
open circuit.
No Go to next step
3 Unplug coolant temperature sensor connector from
wire harness and check the
Yes Go to next step
17
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