E.G.R. SYSTEM - Inspection (Cont'd)

EF & EC-721prose procedure

Throttle chamber control valve check applies to CD20 only.

Inspection (Cont'd)

THROTTLE CHAMBER CONTROL VALVE — CD20

Ensure that throttle chamber control valve is held (closed) at stopper when a vacuum pressure of approximately greater than -13.3 kPa (-133 mbar, -100 mmHg, -3.94 inHg) is applied from a vacuum handy pump to vacuum port.

E.G.R. CONTROL SOLENOID VALVES

Check the solenoid valves for normal operation, after disconnecting the connector and all the vacuum hoses.

Supply the solenoid valves with battery voltage, and check whether there is continuity between ports A, B and C.

E.G.R. control solenoid valve continuity

Item	OFF	ON
Continuity	A-C	A-B

Continuity

OFFA-C

ONA-B

Specification	Value
Resistance	Approx. 35Ω

Resistance

Approx. 35Ω

POTENTIOMETER

1
Disconnect potentiometer connector and connect ohmmeter as shown.
SEC646B
2
Make sure that the resistance changes when the control lever opening angle of the fuel injection pump is changed.

Specification	Value
ResistanceBetween terminals 1 and 3	1 - 3 Approx. 5kΩ

ResistanceBetween terminals 1 and 3

1 - 3 Approx. 5kΩ

ENGINE REVOLUTION SENSOR

1
While idling engine, check AC voltage across terminal a and b.
SEC645B
2
If voltage is not within specifications, conduct a continuity test.
SEC407B
3
Read pulse.

Specification	Value
Engine idlingAC voltage; increases as engine speed is increased	Approx. 0.8V
Resistancecontinuity established	Approx. 1.36 - 1.84kΩ
Pulse	37 pulses/8 engine revolutions

Engine idlingAC voltage; increases as engine speed is increased

Approx. 0.8V

Resistancecontinuity established

Approx. 1.36 - 1.84kΩ

Pulse

37 pulses/8 engine revolutions

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