C. USA Model Year 1984 California

C. USA model year 1984 California










Short test


Test EGR-valve (60) with engine stopped




Activate EGR-valve with approx. 300 mbar vacuum. Pull off vacuum line.

If EGR-valve does not close audibly:
Renew EGR-valve.


Testing voltage at pressure converter (84)




Engine stopped, ignition switched on. Pull plug from pressure converter and connect with multimeter (arrow), push button "V=" and read nominal value 12 V.

If readout is not in order:
Test overvoltage protection and electric activation according to wiring diagram.


Testing vacuum control




Connect vacuum tester with Y-distributor to EGR-valve (60).

Read vacuum values at the following engine speeds:
700-2600/min 280-360 mbar
from approx. 2400 slowly dropping
3000/min approx 60 mbar

If vacuum values are not in order:
Perform testing individual components.

End of test


Testing individual components


Testing temperature sensor for coolant (83)




Engine stopped.
Pull plug from temperature sensor for coolant.
Test resistance against ground.




For nominal value refer to diagram. Test resistance at three temperature measuring points.

Example:
+ 20°C = 2.2-2.8 kohm
+ 80°c = 290-364 ohm
+100°C = 140-222 ohm

If test values are not in order:
Renew temperature sensor

End of test


Testing rpm sensor (82)




Engine stopped.

Separate clutch (2) and test resistance with multimeter.

Readout: 1.9 ± 0.2 kohm

If readout is not in order:
Renew rpm sensor.




Connection as above

Push "V" button

Read test value at the following engine speed
700-800/min > 4V [1]
[1] Voltage increasing with increasing engine speed.

If test values are not in order:
Renew rpm sensor.

End of test


Testing control rod travel indicator




Engine stopped, separate clutch (1). With multimeter in position Ohm (measuring range up to approx. 100 ohm) and test resistance according to drawing.

Readout:
1-2 approx. 25 ± 2
2-3 approx. 25 ± 2
1-3 approx. 50 ± 6

If readout is not in order:
Exchange injection pump with control and travel indicator.




Attention! The control rod travel is set by manufacturer on test bench. Do not remove or change its function.

End of test


Testing pressure converter (84)




Connect vacuum tester to vacuum line of connection (2). Run engine at idle speed. Read vacuum value. Nominal value approx. 450 mbar.

If vacuum is not in order:
Test vacuum lines according to function diagram. Test vacuum pump.




Connect vacuum tester with Y-distributor to connection (1). Connect multimeter with test cable to pressure converter. Push button ,,mA"

Read test values at the following engine speeds:
1/min mbar mA
700-2600 280-360 ~530
from approx 2400 dropping slowly ~370
approx 3000 approx 60 0

If test values are not in order:
Current values in order, renew pressure converter.

Current values not in order, perform activation test according to electric wiring diagram. Renew control unit, if required.

End of test


Testing switchover valve (81)




Connect vacuum tester with Y-distributor to connection (a). Run engine at idle speed. Read vacuum value. Nominal value> approx. 600 mbar.

If vacuum is not in order:
Test vacuum lines according to vacuum diagram. Test vacuum pump.




Connect vacuum tester with Y-distributor to connection (b) Connect multimeter with switchover valve. Push button "V=". Read test values at the following engine speeds:
1/min mbar Volt
700-800 0 0
1000-2500 approx. 600 approx. 12
>3000 0 0


If test values are not in order:
Voltage data in order renew switchover valve

Voltage data not in order, perform activation test according to electric wiring diagram. Renew control unit, if required.

End of test