BLADE AS-STRAIGHT 9W2190 - Caterpillar

The Electronic Control Module (ECM) checks the signals from certain pressure sensors 12 seconds after the keyswitch is turned to the OFF position. The key must remain in the OFF position for a further 2 seconds in order for the ECM to check the signals from the sensors. During this time, the ECM compares the signal from the barometric pressure sensor with the signal from the following pressure sensors:
Intake manifold air pressure
NRS inlet pressure
DPF intake pressure
ARD combustion air pressureThe sensor signal must be within the specified range of the signal from the reference pressure sensor. If, a sensor signal is out of the range the corresponding fault code becomes active.The NRS differential pressure sensor will calibrate to zero differential pressure.The offset value is stored in the engine ECM. If the requirements are not met for the offset to be checked against the barometric pressure sensor, the stored value is used.Test Step 1. Check for Diagnostic Codes
Establish communication between the electronic service tool and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.Wait at least 30 seconds in order for the diagnostic codes to become active.
Look for an active -13 code or for a logged -13 code.Results:
There is an active or there is a logged -13 code for only one sensor. - Proceed to Test Step 2.
There is an active or there is a logged -13 code for more than one sensor. - Proceed to Test Step 3.Test Step 2. Inspect the Suspect Sensor Connector
Turn the keyswitch to the OFF position.
Inspect the connector of the suspect sensor. Verify that there is no moisture.
Turn the keyswitch to the ON position.
Monitor the status parameter for the suspect sensor on the electronic service tool. Wiggle the wiring at the suspect sensor connector.Results:
The value of the status parameter does not remain steady. - Repair: Perform the following procedure.
Disconnect the suspect sensor connector.
Remove any moisture from the outside of the connector. Check for moisture and corrosion inside the connector. Verify that