Hummer H1 Service Manual page 152

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Fuel Solenoid Driver Replacement
Removal
1. Drain the engine coolant and remove the upper radiator
hose from the thermostat housing.
2. Remove the left intake manifold runner to gain access to
the Fuel Solenoid Driver (on the left side of the injection
pump). Refer to Section 2 (Engine) for all model years.
3. Scribe a reference mark on the engine front cover and the
injection pump housing to assist in correctly locating the
Injection Pump during reassembly.
4. Loosen the Injection Pump retaining nuts approximately
1/2 turn, using Injection Pump Timing Wrench J–41711
(do not remove the nuts).
5. Rotate the Injection Pump toward the passenger side of the
vehicle until it stops, using Injection Pump Adjusting tool J–
33042, and re-tighten the top Injection Pump retaining nut.
6. Disconnect the wiring connector at the Fuel Solenoid
Driver (Figure 3-16).
FUEL
SOLENOID
DRIVER
WIRE
CONNECTOR
Figure 3-16: Fuel Solenoid Driver Replacement
7. Loosen the four Fuel Solenoid Driver mounting screws
untill they are free of the injection pump housing, using a
T 15 Torx bit.
8. Remove the mounting screws, Fuel Solenoid Driver and
the heat transfer pad from the Injection Pump. Discard the
heat transfer pad and the mounting screws.
9. Remove the calibrating resistor (Figure 3-17) from the
Fuel Solenoid Driver using special pliers (Klein D319B or
Stanadyne 30858).
CAUTION: The Calibrating Resistor is specific to the injec-
tion pump. Do not damage the resistor. The calibrating resis-
tor identification number is located on the front of the
Calibrating Resistor (Figure 3-17).
CAUTION: If the Calibrating Resistor is damaged or lost, the
Injection Pump must be removed for replacement or taken to a
Stanadyne dealer for calibration. If the Calibrating Resistor is
missing a DTC P1218 will set.
5745159
Fuel, Emissions, and Exhaust
Figure 3-17: Calibrating Resister Transfer
Installation
1. Install the calibrating resistor in the new Fuel Solenoid
Driver using the special pliers (Figure 3-17).
2. Place the new heat transfer pad on the side of the Fuel
Solenoid Driver and insert the mounting screws through
the driver and the pad.
3. Align the Fuel Solenoid Driver mounting screws with the
holes in the pump housing and tighten to 23 lb-in (2.75
N•m).
CAUTION: Do not install the Fuel Solenoid Driver without
the heat transfer pad. Do not reuse a heat transfer pad. Use a
new heat transfer pad only. The heat transfer pad is required
to prevent overheating and rapid failure of the Fuel Solenoid
Driver.
CAUTION: Do not overtighten the Fuel Solenoid Driver
mounting screws. Damage to the Fuel Solenoid Driver will re-
sult.
4. Connect the Fuel Solenoid Driver wiring harness
connector.
5. Loosen the upper Injection Pump retaining nut
approximately 1/2 turn (do not remove the nut).
6. Rotate the Injection Pump back to it's original position,
using the reference marks made previously and tighten the
Injection Pump retaining nuts.
7. Install the intake manifold runner.
8. Connect the upper radiator hose to the thermostat housing
and fill the coolant system.
9. Perform the Injection Timing Adjustment Procedure
below.
3-15
INDEX
NOTCH
ID NO.
4
REMOVAL
HOLES
8-P03-002