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FAULT CODE 115

Engine Position Sensor (EPS) Circuit

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Overview

CODE REASON EFFECT
Fault Code: 115
PID: P190
SPN: 190
FMI: 2
LAMP: Red
SRT: 00-081		 No engine speed signal detected at both pairs of engine position sensor signal pins: 1 and 15 or 11 and 14 of the sensor harness connector. Engine will die and not restart.

Engine Position Sensor (EPS) Circuit

Circuit Description

The engine position sensor monitors the engine position and the engine speed and passes this information to the electronic control module (ECM) through the sensor harness.

Component Location

  • M11 – The engine position sensor is located above the accessory drive.
  • N14 – The engine position sensor is located at the backside of the gear housing flange on the cylinder block, just above the lubrication pump.

Shop Talk

  • If the fault occurs only at a certain engine temperature, check the engine position sensor circuit while the engine is at that particular temperature.
  • Check the camshaft end play to make sure that camshaft gear is not moving too far away from the end of the engine position sensor.
  • Check for moisture in the sensor harness connector at the ECM.
  • If the engine runs rough, check that the engine position sensor is wired with proper polarity. Correct ECM-to-engine position circuit pin-to-pin wiring must be observed.
  • Monitor the engine rpm while cranking the engine with an electronic service tool. No engine speed shown indicates a problem with engine position sensor circuitry.

Cautions and Warnings

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3823996 – female Weather-Pack test lead.
 CAUTION 

 

For ease of installation and removal, use this special tool for the engine position sensor:
Part Number 3824747 – installation tool, engine position sensor.
 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3823996 – female Weather-Pack test lead.
 CAUTION 

 

For ease of installation and removal, use this special tool for the engine position sensor:
Part Number 3822747 – installation tool, engine position sensor.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the engine position circuit.
STEP 1A. Inspect the engine position sensor and the sensor harness connector pins. No damaged pins
STEP 1B. Read the fault codes. Fault Code 115 active or engine will not start
STEP 1C. Check for a short circuit to ground in the engine position sensor. More than 10M ohms
STEP 1D. Inspect the engine position sensor. No damaged engine position sensor
STEP 1E. Check the resistance of the engine position sensor. 1000 to 2000 ohms
STEP 1F. Check for a short circuit between the coils. More than 10M ohms
STEP 2. Check the sensor harness and the ECM connector pins.
STEP 2A. Inspect the sensor harness and the ECM connector pins. No damaged pins
STEP 2B. Read the fault codes. Fault Code 115 active or engine will not start
STEP 2C. Check for proper pin-to-pin wiring between ECM and engine position sensor. Wired correctly
STEP 2D. Check for pin-to-pin continuity. Less than 10 ohms
STEP 2E. Check for a short circuit to the ground. More than 100k ohms
STEP 2F. Check for a short circuit from pin to pin. More than 100k ohms
STEP 2G. Check for an open circuit. 1000 to 2000 ohms
STEP 3. Clear the fault codes.
STEP 3A. Disable the fault code. Fault Code 115 inactive
STEP 3B. Clear the inactive fault codes. All fault codes cleared

Guided Step 1 – Check the engine position sensor.

Guided Step 1A – Inspect the engine position sensor and the sensor harness connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor connector from the engine position circuit.
  • Flush and clean the connector pins using electronic contact cleaner, Part Number 3824510.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals
  • Dirt or debris in or on the connector pins.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the sensor harness. Refer to Procedure 019-201.
  • Replace the sensor harness. Refer to Procedure 019-043.
  • Replace the engine position circuit. Refer to Procedure 019-038.

Guided Step 1B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start and idle the engine 1 minute.
  • Read the fault codes using INSITE™ electronic service tool.
OK NOT OK
Fault Code 115 active or engine does not start Fault Code 115 inactive and engine does start.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3823996 – female Weather-Pack test lead.
Guided Step 1C – Check for a short circuit to ground in the engine position sensor.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor connector from the engine position sensor.

Action

  • Measure the resistance from pin A of the engine position circuit to the engine block ground.
  • Measure the resistance from pin B of the engine position circuit to the engine block ground.
  • Measure the resistance from pin C of the engine position circuit to the engine block ground.
  • Measure the resistance from pin D of the engine position circuit to the engine block ground.

Note: Install the mating connector with short test leads to the sensor connector. While testing the sensor, electrical leads from the sensor to the sensor connector must be gently flexed to check for damaged or partially broken wires under insulation.
OK NOT OK
More than 10M ohms Replace the engine position sensor. Refer to Procedure 019-038.

 CAUTION 

 

For ease of installation and removal, use this special tool for the engine position sensor:
Part Number 3822747 – installation tool, engine position sensor.
Guided Step 1D – Inspect the engine position sensor.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor connector from the engine position sensor.
  • Remove the engine position sensor using the engine position sensor installation tool.

Action

  • Metal debris on end of sensor
  • Damage to end of sensor caused by camshaft gear
  • Oil leakage or insulation problems such as swelling
  • Damaged electrical potting in sensing end of sensor.
OK NOT OK
No damaged engine position sensor Replace the engine position sensor. Refer to Procedure 019-038.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3823996 – female Weather-Pack test lead.
Guided Step 1E – Check the resistance of the engine position sensor.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor connector from the engine position sensor.

Action

  • Measure the resistance from pin A to pin D (outside pins).
  • Measure the resistance from pin B to pin C (inside pins).

Note: Install the mating connector with short test leads to the sensor connector. While testing the sensor, electrical leads from the sensor to the sensor connector must be gently flexed to check for damaged or partially broken wires under the insulation.
OK NOT OK
1000 to 2000 ohms Replace the engine position sensor. Refer to Procedure 019-038.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3823996 – female Weather-Pack test lead.
Guided Step 1F – Check for a short circuit between the coils.

Conditions

  • Turn keyswitch OFF.
  • Disconnect sensor harness from the engine position sensor.

Action

  • Measure the resistance from pin A to pin B of the engine position sensor.

Note: Install the mating connector with short test leads to the sensor connector. While testing the sensor, the electrical leads from the sensor to the sensor connector must be gently flexed to check for damaged or partially broken wires under the insulation.

Note: A false low reading will occur if you are touching the test leads while taking the measurement.
OK NOT OK
More than 10M ohms Replace the engine position sensor. Refer to Procedure 019-038.

Guided Step 2 – Check the sensor harness and the ECM connector pins.

 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
Guided Step 2A – Inspect the sensor harness and the ECM connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.
  • Flush and clean the connector pins using electronic contact cleaner, Part Number 3824510.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals
  • Dirt or debris in or on the connector pins.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the sensor harness. Refer to Procedure 019-203.
  • Replace sensor harness. Refer to Procedure 019-043.
  • Replace ECM. Refer to Procedure 019-031.
  • Replace the o-ring on the 28-pin connector if it is damaged or missing. Refer to Procedure 019-203.

Guided Step 2B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start and idle the engine for 1 minute.
  • Read the fault codes using INSITE™ electronic service tool .
OK NOT OK
Fault Code 115 active or engine does not start Fault Code 115 inactive and engine does start.

Guided Step 2C – Check for proper pin-to-pin wiring between ECM and engine position sensor.

Conditions

  • Turn keyswitch OFF.
  • Disconnect sensor harness connector from ECM.
  • Disconnect engine position sensor from sensor connector.

Action

  • Engine position sensor red wire to D – D to pin 14 of sensor connector.
  • Engine position sensor black wire to A – A to pin 11 of sensor connector.
  • Engine position sensor white wire to B – B to pin 15 of sensor connector.
  • Engine position sensor green wire to C – C to pin 1 of sensor connector.
OK NOT OK
Wired correctly Correct the pinout.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2D – Check for pin-to-pin continuity.

Conditions

  • Turn keyswitch OFF.
  • Disconnect sensor connector from engine position sensor.
  • Disconnect the sensor harness connector from the ECM.

Action

  • Measure from pin D of the sensor connector to pin 14 of the sensor harness ECM connector.
  • Measure from pin A of the sensor connector to pin 11 of the sensor harness ECM connector.
  • Measure from pin B of the sensor connector to pin 15 of the sensor harness ECM connector.
  • Measure from pin C of the sensor connector to pin 1 of the sensor harness ECM connector.
OK NOT OK
Less than 10 ohms Repair or replace harness.

  • Repair the sensor harness. Refer to Procedure 019-203.
  • Replace the sensor harness. Refer to Procedure 019-043.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2E – Check for a short circuit to the ground.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.
  • Disconnect the sensor harness from the engine position sensor.

Action

  • Measure the resistance from pin 1 to the engine block ground.
  • Measure the resistance from pin 11 to the engine block ground.
  • Measure the resistance from pin 14 to the engine block ground.
  • Measure the resistance from pin 15 to the engine block ground.
OK NOT OK
More than 100k ohms Replace the sensor harness. Refer to Procedure 019-043.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2F – Check for a short circuit from pin to pin.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.
  • Disconnect the sensor harness from the engine position sensor.

Action

  • Measure the resistance from pin 1 of the sensor harness ECM connector to all other pins in the sensor harness ECM connector.
  • Measure the resistance from pin 11 of the sensor harness ECM connector to all other pins in the sensor harness ECM connector.
  • Measure the resistance from pin 14 of the sensor harness ECM connector to all other pins in the sensor harness ECM connector.
  • Measure the resistance from pin 15 of the sensor harness ECM connector to all other pins in the sensor harness ECM connector.
OK NOT OK
More than 100k ohms Replace the sensor harness. Refer to Procedure 019-043.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2G – Check for an open circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.
  • Connect the engine position sensor to the sensor harness.

Action

  • Measure resistance from pin 11 to pin 14 at the ECM connector.
  • Measure resistance from pin 1 to pin 15 at the ECM connector.
OK NOT OK
1000 to 2000 ohms Replace the sensor harness. Refer to Procedure 019-043.

Guided Step 3 – Clear the fault codes.

Guided Step 3A – Disable the fault code.

Conditions

  • Connect all the components.

Action

  • Start the engine and let it idle for 1 minute.
  • Verify Fault Code 115 is inactive.
OK NOT OK
Fault Code 115 inactive Return to the troubleshooting steps or contact your nearest Cummins Authorized Repair Location if all the steps have been completed and checked again.

Guided Step 3B – Clear the inactive fault codes.

Conditions

  • Connect all the components.

Action

  • Erase the inactive fault codes using INSITE™ electronic service tool.
OK NOT OK
All fault codes cleared Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting charts
Last Modified:  08-Sep-2004
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