Workshop Manual

11.7 Failure in Driver Stage of Injector
Failure codes: P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270,
P0271
No. Operating steps Result Follow up steps
1 Close the ignition switch, and the engine stops. Next step
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.
Next step
Yes Repeat 2
All yes 6
3 Put the ignition switch to “ON”. Observe if, at the
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).
No Next step
Yes Repair or replace
harness
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.
No Next step
5 Repair or replace fuel pump relay and main relay
and their circuits.
Yes Repair or replace
harness
6 Connect the adaptor bet
ween 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# pin of each corresponding
electromagnetic injector joint on harness.
No Next step
Yes Repeat 7
All yes Next step
7 Use a multimeter to check in turn if a resistance
between 12Ω and 16Ω is present at 20 between ℃
1# and 2# pins (and resistance value of injector) of
the electromagnetic injectors.
No Replace the
electromagnetic
injector
Yes Repeat 8 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).
No Replace ECU
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.