(Table 228, contd)
Diagnostic Codes for the Speed/Timing Sensors
J1939 Code PDL Code
Code Description
(code descriptions may vary)
Comments
637-11 261-11
Engine Timing Sensor : Other Failure Mode
The Electronic Control Module (ECM) detects the following
conditions:
The outputs from the primary speed/timing sensor and the
secondary speed/timing sensor differ by more than 8 degrees
of crankshaft rotation.
The engine has been running for more than 5 seconds.
Diagnostic code 190-8 is not active.
3512 or 3483 diagnostic trouble codes are not active.
The warning light will come on. This code will not be logged.
3512-3 3483-3
Sensor Supply Voltage 4 : Voltage Above
Normal
The ECM detects the following conditions:
The 8 VDC supply is more than 8.8 VDC for more than one
second.
The ECM has been powered for more than 3 seconds.
Diagnostic code 168-4 is not active.
The ECM will log the diagnostic code and the warning lamp
will illuminate while this diagnostic code is active.
The engine may be limited to low idle.
3512-4 3483-4
Sensor Supply Voltage 4 : Voltage Below
Normal
The ECM detects the following conditions:
The 8 VDC supply is less than 7.2 VDC for more than one
second.
The ECM has been powered for more than 3 seconds.
Diagnostic code 168-4 is not active.
The ECM will log the diagnostic code and the warning lamp
will illuminate while this diagnostic code is active.
The engine may be limited to low idle.
An active diagnostic code may not cause any noticeable effect
on engine response unless the voltage drops below 6.5 VDC.
Follow the troubleshooting procedure in order to identify the root cause of the fault.
Use this procedure when the engine will not start and
the electronic service tool indicates a faulty sensor by
displaying “Not Detected” against the faulty sensor
on the “No Start Parameter” screen.
432 UENR4469-36
Circuit Tests
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