Lull 944E-42, Service Manual

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Electrical System
9.186 Model 644E-42/944E-42 Rev. 6/04
9.13.3 Throttle Position Sensor
(944E-42 Only)
The throttle position sensor (1) (944E-42 Only) controls
the engine speed. It is designed to sense the position of
the throttle pedal and sends the signal to the engine
control module.
The sensor is located on the bracket (2) below the dash
where the throttle pedal is attached.
The sensor must be tested while it is still on the vehicle.
a. Inspection and Replacement
1. Inspect the sensor terminals for continuity. Attach
the ohmmeter leads to the two outside pins, 1 (3)
and 3 (4). The resistance reading should be
approximately 4,000 - 6,000 ohms whether the
throttle pedal is at rest or fully depressed.
Attach the ohmmeter leads to pins 2 (5) and 3 (4).
The resistance reading should be approximately
2,000 ohms, with the throttle pedal at rest and
change to approximately 4,000 ohms, with the
throttle pedal fully depressed. (Refer to Section
9.8.27, “944E-42 Electronic Throttle Circuit &
Troubleshooting.”)
2. Replace the sensor if the resistance readings are not
as described in step 1.
b. Removal
1. Unlock and open the engine cover (6).
2. If the vehicle has dual batteries, disconnect both
negative battery cables (8 and 9) from both
batteries.
To access the lower battery (10), loosen the
knob (11) far enough so that the lip (12) on the upper
battery box clears the knob. Lift up the upper battery
box (13) and swing it out, so that the box clears the
hydraulic tank support bracket, to gain access to the
lower negative battery cable (8). Disconnect the
lower negative battery cable
3. Disconnect the ECM cab harness connector (14)
from the throttle position sensor (15).
MU5770
Front
1
2
3
4
5
1
4110390
1.
2.
OU0780
6
7
7
MU0650
8
9
10
11
12
13