Troubleshooting

i06012069
Idle Validation - Test
This procedure covers the following diagnostic
codes.
Table 70
Diagnostic Trouble Codes
J1939
Code
Code Description
Comments
558-2
Accelerator Pedal 1 Low Idle Switch
: Erratic, Intermittent, or Incorrect
The Electronic Control Module (ECM) detects one of the following conditions:
The signal voltage from the throttle pedal is less than 1.05 V for 0.3 seconds while the idle
validation switch is not active.
The signal voltage from the throttle pedal is greater than 1.25 V for 0.3 seconds while the
idle validation switch is active.
The warning lamp will flash. The engine will be derated.
2970-2
Accelerator Pedal 2 Low Idle Switch
: Erratic, Intermittent, or Incorrect
Follow the troubleshooting procedure in order to identify the root cause of the problem.
If the application is equipped with two throttles, the
engine will use the second throttle until the fault is
repaired.
If a second throttle is not installed or if the second
throttle has a fault, the following conditions will occur:
• The engine will default to limp home mode.
• If the engine speed is higher than the speed in
limp home mode, the engine will decelerate to limp
home mode.
• If the engine speed is lower than the speed in limp
home mode, 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 IVS may be installed. The IVS is required for
mobile applications. The IVS is part of the throttle
position sensor. The IVS is CLOSED when the low
idle is set.
The configuration parameters for the throttle and for
the IVS thresholds are programmed into the ECM.
Use the electronic service tool in order to display the
configuration parameters for the throttle and for the
IVS.
If the IVS operates outside of the programmed range,
then the engine speed may not respond to changes
in the throttle position.
The electronic service tool may be used for the
following:
• If necessary, reset the IVS threshold for an
existing IVS.
• If necessary, view the IVS change point and reset
the IVS thresholds when a new throttle assembly
is installed.
140 UENR0612-07
Circuit Tests
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