Failure In Driver Stage Of Injector - Chery QQ6 Service Manual

11.7 Failure in Driver Stage of Injector

Failure codes: P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270,
No.
1 Close the ignition switch, and the engine stops.
2 Pull out each electromagnetic injector joint on
harness in turn, and then lap the two pins of
multimeter between 2# pin of the joint and the
engine.
Put the ignition switch to "ON". Observe if, at the
3
instant when the ignition switch cuts in, the
multimeter displays an around 12V voltage value
of battery (mainly check if the injector has power
supply, which is provided by main relay).
4 Use a multimeter to check in turn if it is break or
short circuit between 87# pin of output terminal of
main relay of the engine and 1# pin of each
electromagnetic injector joint.
5 Repair or replace fuel pump relay and main relay
and their circuits.
6 Connect the adaptor between ECU and harness;
use a multimeter to check in turn if it is break or
short circuit between 27#, 7#, 47# or 6# pins of
ECU and 2#
electromagnetic injector joint on harness.
7 Use a multimeter to check in turn if a resistance
between 12Ω and 16Ω is present at 20
1# and 2# pins (and resistance value of injector) of
the electromagnetic injectors.
8 Re-plug all electromagnetic injector joints, engage
the gear to neutral position, start the engine, and
then let it run at idle speed. Pull out all
electromagnetic injector joints on harness in turn.
Whenever a joint is pulled out, observe if engine
vibration is aggravated accordingly (equivalent to
spark out experiment).
Note: The damage probability of injector is very low; its main failure is carbon deposit
in injection nozzle, which may result in atomization of fuel injection, poor spray and
unsteady idle speed of engine; therefore, when inspecting, above failure should be
inspected as an emphasis.
P0271
Operating steps
pin of each
Result
Yes
All yes
No
Yes
No
Yes
No
corresponding
Yes
℃
between
All yes
No
Yes
No
Follow up steps
Next step
Next step
Repeat 2
6
Next step
Repair or replace
harness
Next step
Repair or replace
harness
Next step
Repeat 7
Next step
Replace the
electromagnetic
injector
Repeat 8
Replace ECU