Perkins 854E-E34TA, Руководство по устранению неисправностей, Страница: 205 / 252

i06019791
Speed Control - Test
This procedure covers the following codes:
Table 99
Diagnostic Trouble Codes for the Analog Throttle Position Sensors
J1939
Code
Description Notes
91-3 Accelerator Pedal Position 1 : Voltage
Above Normal The Electronic Control Module (ECM) detects that the signal from the throttle position sen-
sor is greater than the upper diagnostic limit for at least 0.2 seconds.
The warning lamp will flash. The engine will be derated.
29-3 Accelerator Pedal Position 2: Voltage
Above Normal
91-4 Accelerator Pedal Position 1 : Voltage Be-
low Normal The ECM detects that the signal from the throttle position sensor is less than the lower di-
agnostic limit for at least 0.2 seconds.
The warning lamp will flash. The engine will be derated.
29-4 Accelerator Pedal Position 2: Voltage Be-
low Normal
If a fault occurs with the primary throttle and a
secondary throttle is installed, the engine will use the
secondary throttle until the fault is repaired.
If a fault occurs with the secondary throttle, the
engine will use the primary throttle until the fault is
repaired.
If a functional throttle is not available, the following
conditions will occur:
• The engine will default to the limp home speed.
• If the engine speed is higher than the limp home
speed, the engine will decelerate to the limp home
speed.
• If the engine speed is lower than the limp home
speed, the engine speed will remain at the current
speed.
• The engine will remain at this speed while the
diagnostic code remains active.
• All inputs from the faulty throttle are ignored by the
ECM until the fault is repaired.
• All inputs from the repaired throttle will be ignored
by the ECM until the keyswitch has been cycled.
The diagnostic codes above relate to an analog
sensor. Use this procedure only if the analog sensor
uses an output from a variable resistor.
The sensor is most likely to be mounted on a throttle
pedal. The sensor is attached directly to the throttle
assembly. The sensor provides an output voltage to
the ECM. The sensor output voltage will vary with the
position of the throttle. Foot operated or hand
operated throttle assemblies are available.
The sensor re5 V power from the ECM. The
sensor will produce a raw signal voltage that will alter
between low idle and high idle.
The sensor senses the speed requirement from the
throttle position. A second sensor may override this
speed requirement from the first sensor. This override
will be subject to an input from a secondary throttle or
from the SAE J1939 (CAN) data link or from a PTO
control.
Use the electronic service tool in order to check the
input status.
UENR0612 205
Circuit Tests
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