TP-6391 9/08
57
Section 5 Component Testing and Adjustment
5.11 Electronic Throttle Assembly
The electronic throttle body assembly (ETC) contains
the throttle valve, throttle valve actuator, and throttle
position sensor (TPS1). The ECM calculates the correct
throttle valve opening, makes any adjustments, and
then generates an electrical signal to the throttle-valve
actuator.
The ECM
calculates the correct throttle
position based on RPM and MAP and compares this to
the actual throttle position based on TPS1. The ECM
continuously checks and monitors all sensors and
calculated data. If no redundant signal is available or the
calculated data cannot solve the malfunction, the ECM
shuts the engine down, storing the fault information in
the ECM.
Figure 5-24
Electronic Throttle Body Assembly
Set the generator set master switch to the OFF position
and allow the generator set to cool. Disconnect the TPS
sensor and use an ohmmeter to measure the resistance
across the sensor pins. See Figure 5-25.
TPS (Electronic Throttle) Sensor
Pin Resistance Check (approx.)
Pin 2 (GND) to Pin 6 (TPS1 SIGNAL)
1.25 kOhms
¦
30%
Pin 3 (PWR) to Pin 6 (TPS1 SIGNAL)
1.25 kOhms
¦
30%
Pin 1 (+DRIVER) to Pin 4 (--DRIVER)
3.0 Ohms
¦
30%
Figure 5-25
TPS (Electronic Throttle) Sensor
Resistance
5.12 Fuses
See Figure 5-26 for fuse ratings and part numbers.
Always identify and correct the cause of a blown fuse
before restarting the generator set. Refer to Section 3,
Troubleshooting, for conditions that may indicate a
blown fuse.
Replace blown fuses with identical
replacement parts.
Label
Fuse
Amps
Part
Number
F1
Auxiliary Winding
10
358337
F2
Controller
10
223316
F3
Customer Connection
10
223316
F4
Coils/Injectors
15
283645
F5
ECM, O
2
Sensor, and Fuel
Pumps
15
283645
F6
Voltage Regulator and Battery
Charging Alternator
15
283645
F7
Starter Motor and Crank
Solenoid
20
GM39266
Figure 5-26
Fuses
ADV7025A-A
F1
F2
F3
F4
F5
F6
F7
Figure 5-27
Fuse Location