Service manual

G420F(FE) Service Manual Chapter 6. LPG FUEL DELIVERY SYSTEM 213
Figure 39. Crypt Token Installed on Laptop
Figure 40. Opening the Service Tool Display
Idle Mixture Adjustment
The CA100 mixer requires adjustment of the idle
mixture screw to assure optimal emissions and
performance. This adjustment accounts for minor
part-to-part variations in the fuel system and assures
stable performance of the engine at idle. Once
adjusted, the idle mixture screw is sealed with a
tamper proof cap, after which it need not be
adjusted for the life of the vehicle.
Therefore, the only situations in which the idle
mixture screw needs to be adjusted are when the
engine is initially fitted with a fuel system at the
factory and following the field replacement of the
mixer. Under these situations, follow the procedures
below for adjustment of the idle mixture screw.
Factory Test Preparation:
1. Install the MI-07 fuel system, wiring harness and
SECM-48 control module on the engine.
2. All coolant hoses should be attached, filled with
coolant and bled to remove any air.
3. Attach LPG fuel lines.
4. Attach wiring harness to battery power.
5. Attach exhaust system.
6. If present, set fuel select switch to LPG fuel.
When operated at the factory, it is critical to simulate
the airflow found on a forklift at idle as nearly as
possible in order to achieve the proper air valve lift
in the mixer. It may be necessary to place a load on
the engine to achieve the required airflow without
overspeeding the engine. Means of achieving this
load include:
a) Place an electrical load on the alternator. The
alternator should be able to briefly hold loads
of approximately 1.2 kW.
b) Attach the engine to a dynamometer.
Attach the Mototune Service Tool to the wiring
harness and add parameter MAFPort to the display
screen.