Fuel Injectors - From 99MY

The fuel injectors are located beneath the air inlet manifold. They utilize an electrical solenoid which lifts an injector needle off its seat to allow fuel injection to take place. The fuel injectors provide excellent fuel atomization in the lower portion of the inlet manifold, the air:fuel mixture is then drawn into the cylinders to provide optimum combustion characteristics and excellent driveability.

A fuel pressure test point is provided by means of a Schrader valve positioned between the rear of the engine and the bulkhead, above the coil packs.

There are eight fuel injectors, one per cylinder which the ECM operates sequentially. All the injectors are fed from a common fuel rail as part of the returnless fuel system. Fuel pressure is maintained at a constant 3.5 bar (52 lbs.sq.in) by a regulator that is integral with the fuel pump.


CAUTION: The injectors are extremely sensitive, they must not be dropped or contaminated.


CAUTION: When assembling the injector to the fuel rail, only use clean engine oil to aid assembly. DO NOT use petroleum jelly or other forms of grease, as this will contaminate the injector.


The injectors can be checked using a multimeter to test the resistance values:
- Injector resistance at 20° C = 14.5 ohms ±0.7 ohms

If an injector should fail, the following symptoms may be observed:
- Rough running
- Difficult starting
- Engine misfire
- Possible catalyst damage
- High emissions
- Fuelling and idle speed control adaptations disabled

A fuel injector failure is likely to occur for the following reasons:
- Actuator open circuit
- Short circuit to vehicle 12V supply or ground
- Blocked or restricted injector
- Low fuel pressure

If a fuel injector should fail, the following fault codes will be generated by the ECM diagnostics, which can be retrieved by Testbook:

Injector 1
- P0201 - Open circuit
- P0261 - Short circuit to ground
- P0262 - Short circuit to battery supply

Injector 2
- P0202 - Open circuit
- P0264 - Short circuit to ground
- P0265 - Short circuit to battery supply

Injector 3
- P0203 - Open circuit
- P0267 - Short circuit to ground
- P0268 - Short circuit to battery supply

Injector 4
- P0204 - Open circuit
- P0270 - Short circuit to ground
- P0271 - Short circuit to battery supply

Injector 5
- P0205 - Open circuit
- P0273 - Short circuit to ground
- P0274 - Short circuit to battery supply

Injector 6
- P0206 - Open circuit
- P0276 - Short circuit to ground
- P0277 - Short circuit to battery supply

Injector 7
- P0207 - Open circuit
- P0279 - Short circuit to ground
- P0280 - Short circuit to battery supply

Injector 8
- P0208 - Open circuit
- P0282 - Short circuit to ground
- P0283 - Short circuit to battery supply All injectors
- P0170 - High leak rate detection
- P0300 to P0308 - Misfire detected excess emissions - blocked or restricted injector
- P0300 to P0308 - Misfire detected catalyst damage - blocked or restricted injector