Warm Starting Difficulty - Chery QQ6 Service Manual

12.4 Warm Starting Difficulty

No.
Put the ignition switch to "ON". Use a special
1
diagnostic tester
information record exists.
2 Connect fuel manometer valve. Short 30# and 87#
pins of fuel pump relay to make the fuel pump
run, and then check if fuel pressure is around
400kPa.
3 Disconnect the connecting oil pipe and turn off the
ignition switch. Observe the voltage of fuel system
and look if it is around 300 kPa after an hour.
4 Put the connecting oil pipe through, use fuel tube
clamp to intercept the oil return pipe, meanwhile,
close the fuel manometer valve. Turn off the
ignition switch, after one hour, observe if pressure
of fuel system still can maintain at around 400kPa.
5 Check if there is fuel leakage of fuel injector and
oil pipe.
6 Pull out water temperature sensor joint and start
the engine. Observe if the engine can start with
success.
7 Connect an adaptor between ECU and harness,
check if a voltage around 5V is present on 39#,
17# pins, meanwhile, check if the resistance value
of water temperature sensor is within normal
scope.
8 Replace ECU and perform warm start again;
observe if the engine can be started successfully.
9 Check if there is jam or bending of fuel pipe and if
the pressure regulator valve of oil pump is
working correctly.
10 Check if there is battery voltage between the plugs
of oil pump with multimeter.
11 Try to replace the fuel pump and see if the system
can return to normal.
Operating steps
to check if any failure
Result Follow up steps
Yes Remove the failure
displayed
No Next step
Yes Next step
No 9
Yes Next step
No Repair the
system to
leakage
Yes Replace
pressure regulator
No Next step
Yes Replace the injector
and fuel pipe
No Next step
Yes Check
temperature
circuit
No Next step
Yes Next step
No Repair or replace
the harness
Yes End
No Replace ECU
Yes Next step
No Repair or replace
Yes Next step
No Repair or replace
fuel pump relay and
wires
Yes Next step
No Replace fuel pump
fuel
avoid
fuel
coolant
and