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Diagnostic Manual, Engines, Volume 2

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 2.1 Gasoline Injection System    >   38 Electrical Test Program - Test (Testing Cold Start)


Electrical Test Program - Test (Testing Cold Start)

Test step Test scope
Test connection
Test condition Nominal value Possible cause/Remedy
1.0



 



 
Connect hose "A" to lower chamber using adaptor (044), connect hose "B" to upper chamber.
( 37 , Figure 1 or 2)

Ignition: OFF
Connect pressure gauge.
Run engine to build up pressure. Turn off engine, check for leaks


 

2.0

1
Y1

2
Ignition: OFF
Connect test cable (033) to electro-hydraulic actuator (Y1).
Cool engine with cooling fan (053) or let stand overnight.


3.0 Cold start



Engine: Start For fuel pressures see Table I.
For current values see Table II.
Test fuel system pressure and internal leakage, 32 .

23 10.0
23 11.0
23 13.0
23 14.0




Test and Adjustment Data

Table I Fuel Pressures

System pressure with engine cold or at operating temperature bar 6.2 - 6.4
Lower chamber pressure with engine at operating temperature bar approx. 0.4 1)
at idle with coolant temperature < + 20 oC bar 0.5 1)
during deceleration shut-off bar Lower chamber pressure
equals system pressure.
1) Observe Preparation for Test, see 22 .





Table II Current Values

Engine Current at EHA with
Ignition: ON (mA)
After-start enrichment at an engine coolant temperature of + 20 oC (mA) 1) After-start enrichment at an engine coolant temp. between 0 and + 20 oC (mA) 1) After-start enrichment at an engine coolant temp. between 0 and - 20 oC (mA) 1)
104 20 3 - 5 2) 3 - 45 3) 38 - 80 3)
119 75 5 - 8 2) 5 - 42 3) 42 - 100 3)
1) For resistance substitution unit resistance values, see 23 , Table I.
2) Read value 0 - 8 seconds after startup.
3) Note the following: Read value immediately after startup.
Selector lever position P/N.
Throttle valve closed.