Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 122

Intake Manifold Pressure Sensor Circuit


Overview

CODE REASON EFFECT
Fault Code: 122
PID: P102
SPN: 102
FMI: 3/3
LAMP: Yellow
SRT: 

High voltage detected at the intake manifold pressure sensor circuit.

Derate in power output of the engine.

Intake Manifold Pressure Sensor Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The intake manifold pressure/temperature sensor monitors intake manifold pressure and passes information to the electronic control module (ECM) through the engine harness. If the intake manifold pressure becomes too high, it will cause a derate condition.

Component Location

The intake manifold pressure/temperature sensor is located in the air intake manifold toward the front of the engine.

Shop Talk

  • Determine if engine is being overfueled.
  • Confirm that the correct intake manifold pressure/temperature sensor part number is being used.
  • Confirm that the correct turbocharger is being used.
  • If it is suspected that cold intake air is the cause of the high intake manifold pressure, test the engine with warm intake air.
  • Inspect the intake manifold pressure/temperature sensor circuit for signs of tampering. Remove any extra wires from the circuit.

Refer to Troubleshooting Fault Code t05-122.

Last Modified:  26-Oct-2010