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Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315

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BuyFindarrow_forward

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

The PCM checks for a closed throttle plate each time the engine starts. This becomes the base for all throttle settings and can be viewed by looking at the PID with the throttle closed. Which of the following would not cause an abnormal reading and a higher-than-normal idle speed?

a. A bad TP sensor

b. A bad IAC valve

c. Loose or worn throttle plates

d. Excessive noise in the TP or related circuits

To determine

All are the reasons for abnormal reading and higher than normal idle speed.

Explanation

Given:

The PCM checks for a closed throttle plate each time.

The PCM in an engine system that always checks for a closed throttle plate and with this information it can control the idle speed of the engine. The PCM detects the throttle position according to the voltage signals frequency. Like, the lowest signal was detected when the engine starts...

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