i06167055
Speed Control - Test
(Analog)
This procedure covers the following diagnostic
codes:
Table 224
Diagnostic Trouble Codes for Analog Throttles
J1939 Code PDL Code
Code Description
(code descriptions may vary)
Comments
91-3 91-3
Accelerator Pedal Position 1 : Voltage Above
Normal
The Electronic Control Module (ECM) detects one of the fol-
lowing conditions:
The ECM has been powered for 3 seconds.
Diagnostic code 168-4 is not active.
3509 (262) codes are not active.
The setting for the upper diagnostic limit has been exceeded
for one second.
If equipped, the warning lamp will come on. The diagnostic
code will be logged.
29-3 774-3
Accelerator Pedal Position 2: Voltage Above
Normal
91-4 91-4
Accelerator Pedal Position 1 : Voltage Below
Normal
The ECM detects one of the following conditions:
The ECM has been powered for 3 seconds.
Diagnostic code 168-4 is not active.
3510 (2131) codes are not active.
The setting for the lower diagnostic limit has been exceeded
for one second.
If equipped, the warning lamp will come on. The diagnostic
code will be logged.
29-4 774-4
Accelerator Pedal Position 2: Voltage Below
Normal
Follow the troubleshooting procedure in order to identify the root cause of the fault.
If a fault occurs with the primary throttle with
secondary throttle is installed, the secondary throttle
will be used 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.
UENR4469-36 419
Circuit Tests
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