Monitor GDS Data
1.

Connect GDS to Data Link Connector (DLC).

2.

Warm engine up to normal operating temperature.

3.

Turn "OFF" electrical devices and A/C.

4.

Monitor "FUEL PRESSURE MEASURED", "RAIL PRESS. REGULATOR1", "INJ. PUMP REGULATOR" parameter on the GDS.

Specification :

Idle(without load)

Accelerating(stall test)

Diagnosis

INJ. PUMP REGULATOR

38 ± 5%

32 ± 5%

duty decreases

FUEL PRESSURE

MEASURED

28.5 ± 5 Mpa

145 ± 10 Mpa

press. increases

RAIL PRESS.

REGULATOR1

19 ± 5%

48 ± 5%

duty increases

Fig.1) Service data of Fuel pressure regulator valve at idle.

note

The waveform of rail pressure regulator valve installed at common rail shows 19% duty at idle,

duty rises to approx. 48% at acceleration to raise rail pressure. Duty rise means the increase of current.

→ If current rises, the returning quantity of fuel deliverd to common rail decreases and common rail pressure rises.

Яндекс.Метрика