PACCAR PX-8 CM2150 (2007-09) Fault Code: 2973 PID: 102 SPN: 102 FMI: 2 Intake Manifold 1 Pressure – Data Erratic, Intermittent, or Incorrect. The ECM has detected an intake manifold pressure signal that is too high or low for present engine operating conditions.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM. Use the corresponding Troubleshooting and Repair Manual for the engine being serviced.

The intake manifold 1 pressure sensor monitors pressure in the intake manifold. This fault is set active when the intake manifold pressure is too high or low for the present engine operating conditions. The ECM compares the intake manifold pressure reading to turbocharger speed to determine if the pressure reading is valid.

Possible causes:

1)A damaged intake manifold pressure sensor
2)A malfunctioning barometric pressure sensor
3)Leaks in the air intake system between the turbocharger and intake manifold
4)Restriction in the charge-air cooler
5)A malfunctioning turbocharger speed sensor
6)Plugged or restricted exhaust system
7)A plugged intake manifold pressure sensor
8)Air filter restriction.

Possible repairs:

1)Replace the barometric pressure sensor.
2)Replace the engine intake manifold pressure/temperature sensor.
3)Flush the dirt, debris, or moisture from the connector pins. Use electronic contact cleaner.
4)Install the appropriate connector seal if it is damaged or missing.
5)Repair or replace the engine harness.
6)Replace the ECM.
7)Repair or replace the leaking component.
8)Replace the turbocharger
9)Clean or replace the charge-air cooler
10)Replace the turbocharger speed sensor.
11)Repair or replace the restricted component.