DTC 62, Turbo Boost Sensor Circuit Low: Notes

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1995 GMC Yukon, 1995 GMC Suburban, 1995 GMC Pickup, 1995 GMC Cab & Chassis, and 1995 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

PCM sends a 5-volt reference signal to boost sensor. As manifold pressure changes, electrical resistance of boost sensor also changes. By monitoring sensor output voltage, PCM detects how much pressure is being produced by turbocharger in intake manifold. PCM uses boost sensor to control turbo boost and fuel at different loads. DTC 62 will set when boost signal voltage is less than .8 volt. PCM will default to no turbo boost and limited fuel.

NOTE: Test numbers refer to numbers on diagnostic chart.

This step determines if DTC 62 is result of a hard failure or an intermittent condition.
This step simulates conditions for DTC 61. If PCM recognizes change, then PCM, 5-volt reference circuit and boost signal circuit are okay.