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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

While diagnosing an idle speed problem: Technician A says that higher-than-normal TP signals at idle will cause the IAC to close, which will decrease idle speed. Technician B says that if the resistance of the ECT is too low, a lower-than-normal voltage signal is sent to the PCM, which interprets this as a hot engine and will close the IAC to decrease speed. Who is correct?

a. Technician A

b. Technician B

c. Both A and B

d. Neither A nor B

To determine

While diagnosing an idle speed problem: The technician with correct approach.

Explanation

Given:

Technician A says that higher than normal TP signals at idle will cause the IAC to close, which will decrease idle speed.

Technicians B say that if the resistance of the ECT is too low, a lower than normal voltage signal is sent to the PCM, which interprets this as a hot engine and will close the IAC to decrease speed.

If the idle speed is not within the specifications, then the system should be looked with the help of a scan tool. Many different inputs will affect the performance of ideal air control valves (IAC) and cause other driveability problem...

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