Diagnostic Trouble Codes | ||
---|---|---|
J1939 Code and Description | Conditions that Generate the Code | System Response |
190-8 Engine Speed : Abnormal Frequency, Pulse Width, or Period | The signal from the primary engine speed/timing sensor is intermittent or the signal has been lost. | The engine will use the signal from the secondary engine speed/timing sensor for engine speed/timing. The code is logged. |
637-13 Engine Timing Sensor : Out of Calibration | the engine has failed the automatic timing calibration during engine start-up | The value of the timing offset that has been stored in memory will be used. This value will continue to be used for the timing calibration until the diagnostic is resolved The code is logged. |
723-8 Engine Speed Sensor #2 : Abnormal Frequency, Pulse Width, or Period | The signal from the secondary engine speed/timing sensor is intermittent or the signal has been lost. | The engine will use the signal from the primary engine speed/timing sensor for engine speed/timing. The code is logged. |
Illustration 1 | g02128717 |
Schematic for the engine speed/timing sensors |
Illustration 2 | g01167684 |
Typical engine speed/timing sensor (1) Mounting flange (2) Mounting surface |
Illustration 3 | g01167704 |
Typical engine speed/timing sensor (3) O-ring |
Illustration 4 | g01167708 |
Location of the engine speed/timing sensors (typical front engine view) (4) Harness connectors for the secondary engine speed/timing sensor (5) Harness connectors for the primary engine speed/timing sensor |
Illustration 5 | g02133273 |
(6) J2/P2 ECM connector |
Illustration 6 | g02129242 |
P2 terminals that are associated with the engine speed/timing sensors (P2-25) Primary engine speed/timing − (P2-35) Primary engine speed/timing + (P2-46) Secondary engine speed/timing + (P2-47) Secondary engine speed/timing − |