Maintenance Manual for Chery·Windcloud Marelli EFI System
injector connector and cathode of power supply
with a multimeter to see if it is around 3.7V.
No Go to next step
Yes
Repair or
replace wire
harness 6
Check the connection between Pin 2 of Cylinder 4
injector connector and Pin 72 of ECU to see if open,
short circuit to power/ground occurs.
No
Diagnosis
Instruction
Failure: control circuit error of fuel pump
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “OFF”.
Go to next step
Yes Go to Step 4
2
Unplug fuel pump relay, turn ignition switch to
“ON”, check respectively the voltage between Pin
30 of relay and cathode of power supply, Pin 86 of
relay (i.e. power supply terminals of fuel pump
relay) and cathode of power supply to see if it is
around 12V.
No Go to next step
Yes
Repair or
replace wire
harness
3
Check power supply terminal circuit of relay to see
if open circuit or short circuit to ground occurs.
No Go to Step 2
Yes
Replace fuel
pump relay
4
Check the voltage between Pin 85 of fuel pump
relay (control terminal) and cathode of power
supply with a multimeter to see if it is around 3.7V.
No Go to next step
Yes
Repair or
replace wire
harness
5
Check the connection between Pin 85 of relay and
Pin 15 of ECU to see if open, short circuit to
power/ground occurs.
No
Diagnosis
Instruction
Failure: circuit error of knock sensor
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “OFF”.
Go to next step
Yes Go to next step
2
Unplug knock sensor connector from wire harness,
check the resistance between Pin 1 and Pin 2 of
knock sensor with a multimeter to see if it is greater
than 1MΩ.
No Replace sensor
3
Check respectively the connections between Pin 1
of knock sensor connector and Pin 56 of ECU, Pin 2
of knock sensor connector and Pin 70 of ECU to see
Yes
Repair or
replace wire
harness
25
To Next Page
Loading...
