Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic, Intemittent, or Incorrect
FAULT CODE 115
Engine Magnetic Crankshaft Speed/Position Lost Both of Two
Signals - Data Erratic, Intemittent, or Incorrect
Overview
CODE REASON EFFECT
Fault Code: 115 Engine Magnetic Crankshaft Speed/ Fueling to the injectors is
PID: P190 Position lost both of two signals - Data disabled, and the engine can not
SPN: 612 Erratic, Intermittent, or Incorrect. The be started.
FMI: 2 ECM has detected that the primary engine
LAMP: Red speed sensor and the backup engine speed
SRT: sensor signals are reversed.
Engine Speed Sensor and Camshaft Position Sensor Circuit
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.
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Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic, Intemittent, or Incorrect
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.
Troubleshooting Steps
STEPS SPECIFICATIONS
STEP 1. Check the fault codes.
STEP 1A. Determine if Fault Fault Code 115 becomes active during cranking?
Code 115 becomes active during
cranking.
STEP 1B. Inspect the engine Harness connectors connected to correct sensors?
harness.
STEP 2. Clear the fault codes.
STEP 2A. Disable the fault code. Fault Code 115 inactive?
STEP 2B. Clear the inactive All fault codes cleared?
fault codes.
Guided Step 1 - Check the fault codes.
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Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic, Intemittent, or Incorrect
Guided Step 1A - Determine if Fault Code 115 becomes active during
cranking.
Conditions
Turn keyswitch ON.
Connect INSITE electronic
service tool.
Action
Attempt to start the engine by engaging
the starter for at least ten seconds.
Use INSITE electronic service
tool to read the fault codes.
Fault Code 115 becomes active during Fault Code 115 becomes active during
cranking? cranking?
YES NO
No Repair No Repair
Go to 1B Go to 2A
Guided Step 1B - Inspect the engine harness.
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Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic, Intemittent, or Incorrect
Conditions
Turn keyswitch OFF.
Action
Inspect the engine harness connectors for
correct connections.
Make sure that the main engine
speed sensor (crankshaft position
sensor) and the backup engine speed
sensor (camshaft position sensor)
are connected to the engine wiring
harness correctly.
Harness connectors connected to correct Harness connectors connected to correct
sensors? sensors?
YES NO
No Repair No Repair
Go to 2A Go to 2A
Guided Step 2 - Clear the fault codes.
Guided Step 2A - Disable the fault code.
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Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic, Intemittent, or Incorrect
Conditions
Connect all components.
Connect INSITE electronic
service tool.
Action
Disable the fault code.
Start the engine and let it idle for 1
minute.
Use INSITE electronic service
tool to verify that the fault code is
inactive.
Fault Code 115 inactive? Fault Code 115 inactive?
YES NO
No Repair No Repair
Go to 2B Go to 1A
Guided Step 2B - Clear the inactive fault codes.
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Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic, Intemittent, or Incorrect
Conditions
Connect all components.
Turn keyswitch ON.
Connect INSITE electronic
service tool.
Action
Clear the inactive fault codes.
Use INSITE electronic service
tool to erase the inactive fault codes
All fault codes cleared? All fault codes cleared?
YES NO
No Repair No Repair
Repair complete Appropriate troubleshooting steps
Last Modified: 29-Nov-2004
Copyright 2004
Cummins, Inc.
All rights reserved
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