Cummins ISB CM550 (1990-94) Fault Code: 115VP44 PID: 190 SPN: 190 FMI: 2 Engine Speed Sensor (ESS) Circuit

Cummins ISB CM550 (1990-94) Fault Code: 115VP44 PID: 190 SPN: 190 FMI: 2 Engine Speed Sensor (ESS) Circuit

Circuit Description
The engine speed sensor provides engine speed information to the engine control module (ECM).
The sensor must be powered up by (+) 5 VDC to operate. The sensor generates its signals by
sensing the movement of target teeth machined into a tone wheel that is mounted to the crankshaft. The tone wheel has 35 teeth and a gap where the 36th tooth would be placed. This missing tooth indicates cylinder 1 and 6 are at top dead center.

Component Location
The engine speed sensor is located on the intake side of the engine block, at crankshaft level,
between cylinders 4 and 5 on ISB and QSB5.9 engine with the Bosch fuel system.

Shop Talk
This fault code will also cause a fuel derate. This could be the cause of a low-power complaint. Also, this fault code can cause starting problems in cold weather.
ISB and QSB engines with the fuel pump system use separate sensors for engine speed and position.

Related

Categories Cumminz, DTC TRUCKS, ISB CM550 (1990-94) Tags 1990, 94, CM550, Cummins, FaultCode115VP44, FMI2, ISB, PID190, SPN190

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