System Specifications

Fig. 3 Cold start valve injection time chart:

Ignition Timing (vacuum hoses connected) -- 6° +/- 1° BTDC
Idle Speed (oxygen sensor & all hoses connected) -- 800 - 900 rpm
Oxygen sensor system testing (duty cycle method):
Oxygen sensor connected,
PCV hose at valve cover disconnected and open,
Cap removed from evaporative canister return hose.
Checking specification -- 4 - 16 mA
Adjustment specification -- 9 - 11 mA
CO should be 0.3% - 1.2%
Oxygen sensor system testing (exhaust analyzer method)
Oxygen sensor disconnected,
PCV hose at valve cover disconnected and open,
Cap removed from evaporative canister return hose.
CO should be 0.3% - 1.2%
Connect oxygen sensor.
With engine running, duty cycle should fluctuate slightly.
Fuel Pump Volume (cc/30 sec.):
760cc at 12vdc
600cc at 11vdc
460cc at 10vdc
320cc at 9vdc
System Pressure -- 5.2 - 5.6 bar (75 - 81 psi)
Differential Pressure:
Connector disconnected from regulator -- 0.2 - 0.5 bar (3 - 7 psi) below system pressure
Connector connected to regulator, ignition ON, and a 15K ohm resistor (VW 1490 or equivalent) connected to the temp. sensor plug -- 0.7 - 1.2 bar (10 - 17 psi) below system pressure
Differential Pressure regulator resistance -- 17.5 - 21.5 ohms
Residual Pressure (after 10 min) -- 2.6 bar (38 psi)
Injectors:
Fuel quantity after 20 sec. at full throttle -- 80 ml
Max. difference between injectors -- 8 ml
Thermo-time Switch:
Minimum voltage supply -- 11.5vdc
Connection duration -- See chart
Cold start injector:
Minimum voltage supply -- 11.5vdc
Injection time (in seconds) -- See Chart, Fig. 3.
Air flow meter potentiometer:
Between terminals 2 & 3 -- less than 1K ohm
Between terminals 1 & 2 -- at least 4K ohm