Test Description
WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic procedures.
- 3
The TP sensor may be able to self auto zero after several engine starts if the TP sensor is stuck, but may not be able to reach the sensors range near 100 percent. The TP angle should increase steadily. If the voltage value spikes high or low, consider the test failed. - 4
The TP sensor has an auto zeroing feature. If the voltage reading is 0.2-0.9 volts, the PCM will assume the TP sensor is at a closed TP of 0 percent. If the reading is out of the auto zeroing range at closed throttle, look for a binding or damaged linkage. - 6
While starting the engine, the MAP sensor should detect any changes in manifold pressure. This test is to determine if the sensor is stuck at a value. - 7
A normal MAP sensor will react as quickly to the throttle changes as they can be made. A MAP sensor should not appear to be lazy or catch up with the throttle movements. - 28
Spread terminals or faulty electrical connections can produce normal results when the circuits are probed but cause incorrect readings when the circuits are connected. Be sure to check all terminals for this condition.