OEM PRESSURE SENSOR CIRCUIT
CUMMINS
FAULT CODE: 297
PID: P223
SPN: 1084
FMI: 3
OEM Pressure Sensor Circuit
DESCRIPTION
The OEM sensor signal is used by the electronic control module
(ECM) to monitor the OEM pressure. The OEM pressure is used by
the ECM in one of two ways: 1. The ECM can shut down the engine
based on an OEM pressure input value exceeding or falling below a
customer-specified value. 2. The ECM can control a device (dual-
output driver A and driver B) based on the value of the OEM
pressure. A sensor that has failed high can be caused by an open
circuit in the signal or return wire, voltage shorts in the signal or
return wire, or a faulty sensor.
The sensor voltage signal is the responsibility of the OEM. Refer to
the OEM manual for specifications.
COMPONENT LOCATION
The location varies with the OEM. Refer to the OEM manual.
TROUBLESHOOTING STEPS
Step 1A) Turn key switch OFF and disconnect the OEM harness from the OEM pressure sensor. Inspect the
OEM harness and sensor connector pins for the following:
• Bent or broken pins
• Pushed back or expanded pins
• Corroded pins
• Moisture in or on the connector
• Dirt or debris in or on the connector pins
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No damaged pins?
Yes - Go to 1B No - Repair or replace the OEM harness or the OEM
pressure sensor
Go to 4A
Step 1B) Turn key switch OFF and disconnect the OEM harness from the OEM pressure sensor. Check the
voltage of the OEM pressure sensor.
Voltage between (+)0.5 to 4.5 VDC?
Yes - Go to 2A No - Replace the OEM pressure sensor, or repair
OEM pressure sensor voltage source/wiring
Go to 4A
Step 2A) Turn key switch OFF and disconnect the OEM harness from the OEM pressure sensor.
Disconnect the OEM harness from the ECM. Inspect the OEM harness and connector pins for the following:
• Bent or broken pins
• Pushed back or expanded pins
• Corroded pins
• Moisture in or on the connector
• Dirt or debris in or on the connector pins
No damaged pins?
Yes - Go to 2B No - Repair or replace the OEM harness
Go to 4A
Step 2B) Turn key switch ON and read the fault codes using the diagnostic tool.
Fault Code 2967 active?
Yes - Go to 2C No - Repair is complete
Go to 4B
Step 2C) Turn key switch OFF and disconnect the OEM harness from the OEM pressure sensor.
Disconnect the OEM harness from the ECM. Check for an open circuit in the signal wire. Measure the
resistance from pin 48 of the OEM harness connector to the appropriate pin of the OEM pressure sensor
connector.
Less than 10 ohms?
Yes - Go to 2D No - Replace the OEM harness
Go to 4A
Step 2D) Turn key switch OFF and disconnect the OEM harness from the OEM pressure sensor.
Disconnect the OEM harness from the ECM. Check for a short circuit from the signal wire to all other pins.
Measure the resistance from pin 48 of the OEM harness connector to all other pins in the OEM harness
connector.
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More than 100k ohms?
Yes - Go to 3A No - Replace the OEM harness
Go to 4A
Step 3A) Turn key switch OFF and disconnect the OEM harness from the ECM. Check for appropriate ECM
response. Install a jumper wire between pins 48 and 20 of the OEM side of the ECM. Turn key switch ON
and read the fault codes using the diagnostic tool.
Fault Code 29 inactive and Fault Code 298 active?
Yes - Go to 4A No - Replace the ECM
Go to 4A
Step 4A) Connect all components and disable the fault code. Start the engine, and let idle for 1 minute.
Verify that Fault Code 297 is inactive.
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Fault Code 297 inactive?
Yes - Go to 4B No - Return to the troubleshooting steps or contact
local Cummins Authorized Repair Location if all
steps have been completed and checked again
Go to 1A
Step 4B) Connect all components and clear the inactive fault codes using the diagnostic tool.
All fault codes cleared?
Yes - Repair is complete No - Troubleshoot any remaining active fault codes
with appropriate troubleshooting steps.
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