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PCC1302 PowerCommand Code 3131 Engine Crankshaft Speed Above Rated Speed

Posted on March 13, 2025 by
PCC1302-Power-Engine

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Here is the instruction show you guide on how to diagnostic and repair PCC1302 PowerCommand Code 3131 – Engine Crankshaft Speed Above Rated Speed (Warning)

PCC1302-Power-Engine
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Engine speed signals indicate an engine speed 15% greater than rated.

Possible Cause:
1 Fault simulation feature is enabled
2 Incorrect threshold setting
3 Incorrect fuel type setting
4 Faulty engine speed sensor connections
5 Faulty engine harness
6 Faulty engine speed/position sensor
7 Mag Pickup Unit not adjusted properly

Diagnosis and Repair:
1 Fault simulation feature is enabled
a Verify that the fault simulation feature for the sensor is not enabled.
a Connect InPower.
b Verify that the fault simulation is not enabled for the engine speed sensor by connecting to the PCC via InPower. If the fault simulation is disabled, there is no problem.

2 Incorrect threshold setting
a Connect InPower.
b Verify that fault threshold is within the normal operating range for the engine overspeed sensor. Refer to the engine manual for correct threshold values and make the appropriate changes using InPower.

3 Incorrect fuel type setting
a Connect InPower.
b Verify the fuel source set with InPower is the same fuel used by the generator set.

4 Faulty engine speed sensor connections
a Inspect the engine speed sensor and the harness connector pins.
a Disconnect the engine harness connector from the engine speed sensor.
b Inspect for corroded pins, bent or broken pins, pushed back or expanded pins.
c Inspect for evidence of moisture in or on the connector.
d Inspect for missing or damaged connector seals.
e Inspect for dirt or debris in or on the connector pins.

5 Faulty engine harness
a Inspect the engine harness and the connector pins.

b Disconnect the engine harness connector from the extension harness.
c Inspect for corroded pins, bent or broken pins, pushed back or expanded pins.
d Inspect for evidence of moisture in or on the connector.
e Inspect for missing or damaged connector seals.
f Inspect for dirt or debris in or on the connector pin.
g Disconnect harness from ECM and sensor.
h Measure the resistance in each pin from ECM to sensor. Resistance should be 5
ohms or less.
i Repair or replace harness as necessary.

6 Faulty engine speed/position sensor
a Inspect the engine speed sensor.
b Disconnect the engine speed/position sensor from the engine and engine harness.
c Inspect sensor for bent, corroded or loose pins.
d Inspect the sensor for structural deficiencies.
e Check the crankshaft speed sensor supply voltage.
f Disconnect the engine harness connector from the crankshaft speed sensor.
g Install the speed sensor breakout cable between the sensor and the sensor harness
connector.
h Measure the supply voltage by connecting the breakout cable’s supply and return connectors to the multimeter. If the reading is between 4.75 and 5.25 VDC, then the supply voltage is correct.
i Check the crankshaft speed sensor signal (sense) voltage.
j Disconnect the engine harness connector from the camshaft position sensor.
k Install the speed/position sensor breakout cable between the sensor and the sensor harness connector.
l Measure the signal voltage by connecting the breakout cable’s signal and return connectors to the multimeter. If the reading is between 0.46 and 4.56 VDC, then the signal voltage is correct. If not, sensor is faulty.

7 Mag Pick is wound in too closely to flywheel
a Using a multimeter, verify that the voltage to the PCC is between 2.5V and 35V during the start up and running of the generator.
b Using a multimeter, adjust the position of the mag pickup to ensure the voltage does not exceed 35V while the generator is running.

Refer to the engine manual for correct threshold values and make the appropriate changes using InPower v14.5 pro.

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