Maintenance Section
-149-
Fuel Trim Valve(FTV) Inspection
(G643E Engine only)
1. Visually inspect the Fuel trim valve(3) for abrasions
or cracking. Replace as necessary.
2. To ensure the valve is not leaking a blow-by test
can be performed.
3. With the engine off, disconnect the electrical
connector to the FTV.
4. Disconnect the vacuum line from the FTV to the
pressure regulator/converter, at the converter’s tee
connection.
5. Lightly blow through the vacuum line connected to
the FTV. Air should not pass through the FTV when
de-energized. If air leaks past the FTV when de-
energized, replace the FTV.
Inspect Electrical System (G643E
Engine only)
1. Check for loose, dirty or damaged connectors and
wires on the harness including: Fuel lock-off, TMAP
sensor, O2 sensor, Electronic throttle, Control
Relays, Fuel Trim Valve, Foot Pedal, and Distributor
sensor.
2. Repair and/or replace as necessary.
Overhead Guard – Inspect
1. Check tightness of overhead guard mounting bolts
at 80 N•m (60 lb•ft).
2. Check overhead guard for bent or cracked sections.
Have repairs made if needed.
Steer Suspension - Inspect
1. Inspect the suspension mounting bolts. Tighten
suspension mounting bolts, if necessary, to 240+
30
N•m (180+
20 lb•ft).
2. Look for leaks at the power steering hose
connections.
3. Remove any trash buildup on the suspension or the
steer axle.
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