SPN 612 - FMI 2 (Fault Code 115)
Saturday, June 24, 2017
Fault Codes CUMMINS ISB ISBe QSB4.5 QSB5.9 QSB6.7 ISC QSC8.3 ISL ISLe QSL9 CM850 (CM2850)
SPN612 FMI2
Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic,
Intermittent, or Incorrect
CODES:
Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic,
Intermittent, or Incorrect
 |
| Original Wiring Harness - Engine Speed Sensor and Camshaft Position Sensor Circuit |
CODES:
Fault Code: 115
PID(P), SID(S): P190
SPN: 612
FMI: 2
Lamp: Red
SRT:
 |
| Revised Wiring Harness - Engine Speed Sensor and Camshaft Position Sensor Circuit |
REASON: Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signal - Data Erratic, Intermittent, or Incorrect. The ECM has detected that the primary engine speed sensor and the backup engine speed sensor signals are reversed.
EFFECT: Fueling to the injectors is disabled, and the engine can not be started.
Circuit Description:
The main engine speed sensor (crankshaft position sensor) and the backup engine speed sensor (camshaft position sensor) are connected to the engine wiring harness.
Component Location:
The main engine speed sensor (crankshaft position sensor) reads a tone wheel that is mounted to the front of the engine crankshaft. The backup engine speed sensor (camshaft position sensor) reads a tone wheel that is inside the front cover.
Shop Talk:
The main engine speed sensor (crankshaft position sensor) and the backup engine speed sensor (camshaft position sensor) are located in close proximity to one another. The same sensor is used in both locations. (Connector key is the same.) A P-clip on the engine wiring harness prohibits the harness connectors from being connected to the incorrect sensors. However, if the P-clip is omitted, it is possible to plug the wiring harness connectors into the incorrect sensors. If this occurs, the ECM will detect the problem and the engine will not start. Once the connector problem is corrected, the engine can be started and the fault code will become inactive.
The sensor return configuration for Euro 4 ISB engines has been changed for automotive wiring harnesses manufactured from February 2012 onward. The new style wiring harnesses can be be identified using the method below:
• Disconnect the ECM connector
• Disconnect the camshaft position sensor
• Disconnect the intake manifold pressure/temperature sensor
• Check for continuity between the intake manifold pressure/temperature sensor RETURN pin, and the camshaft position sensor RETURN pin.
• Check for continuity between ECM pin 47 and the camshaft position sensor RETURN pin.
• Use the table below to determine which harness is fitted to the engine.
NOTE: QSB engines, all C series engines, and all L series engines are not affected by this change.
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