This diagnosis is typically the difference between intake manifold temperature dand EGR
temperature is less than threshold (low box).
87.5.1
Temperature Difference Check
Check as follows:
1. Inspect the entire air intake system including the CAC for leaks, cracks or plugging.
[a] If damage is found, repair as necessary. Refer to section 87.5.1.1.
[b] If no damage is found, go to step 2.
2. Disconnect the Intake Manifold Temperature Sensor.
3. Inspect the Intake Manifold Temperature Sensor connectors for bent, spread or corroded
pins.
[a] If pin damage is found, repair as necessary. Refer to section 87.5.1.1.
[b] If no pin damage is found, replace the Intake Manifold Temperature Sensor.
Refer to section 87.5.1.1.
