(Table 227, contd)
Troubleshooting Test Steps
Values Results
G. Turn the keyswitch to the ON position.
H. Check the duty cycle of the position sensor on the elec-
tronic service tool while the digital throttle is being moved over
the full range.
i06167060
Speed/Timing - Test
This procedure covers the following diagnostic
codes:
Table 228
Diagnostic Codes for the Speed/Timing Sensors
J1939 Code PDL Code
Code Description
(code descriptions may vary)
Comments
190-8 190-8
Engine Speed : Abnormal Frequency, Pulse
Width, or Period
The Electronic Control Module (ECM) detects the following
conditions:
An intermittent loss of signal or a complete loss of signal from
the primary speed/timing sensor for 2 seconds
The engine has been running for more than 3 seconds.
3512 or 3483 diagnostic trouble codes are not active.
The warning light will come on and the diagnostic code will be
logged.
The ECM will use the signal from the secondary speed/timing
sensor.
The engine will be derated. If the signal from the secondary
speed/timing sensor is also lost, the engine will shut down.
723-8 342-8
Engine Speed Sensor #2 : Abnormal Fre-
quency, Pulse Width or Period
The Electronic Control Module (ECM) detects the following
conditions:
A loss of signal from the secondary speed/timing sensor for 2
seconds while the signal from the primary speed/timing sensor
remained valid
The engine has been running for more than 3 seconds.
3512 or 3483 diagnostic trouble codes are not active.
The warning lamp will come on and the diagnostic code will be
logged.
The loss of signal from the secondary speed/timing sensor will
prevent the engine from starting.
(continued)
UENR4469-36 431
Circuit Tests
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