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EEC-IV code 74

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Old Nov 25, 2004 | 05:01 PM
  #1  
twilightman's Avatar
twilightman
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From: Wheat Ridge, CO
EEC-IV code 74

Does any one have information about this code?
I’s the only code I'm getting now in the engine running part of the <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com></O></FONT>

In the KOEO part, I get code 11.

And YES before any one asked if I stepped on the brakes at the right time, (after the engine code is sent) I did in fact step on the brake pedal, I Know it the right one as this is an automatic and the only large pedal.<O></O>

How important it this code and what does it mean when it is a fault
 
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Old Nov 25, 2004 | 07:33 PM
  #2  
Ken00's Avatar
Ken00
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Joined: Dec 2001
Posts: 10,562
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From: South Jersey
Pinpoint test FD Brake On/Off (BOO)


FD1 - Code 74

Did you press the brake during the KOER test.

Yes – Go to FD2

No – Rerun KOER test


FD2

Check for damaged or corroded pins at processor

Install breakout box, leave processor disconnected, and measure voltage between pin 2 and 40 while depressing and releasing the brake pedal.

Does the voltage cycle?

Yes – Replace processor

No – Go to FD3

FD3

Install breakout box, leave processor disconnected.



Is the resistance greater than 10,000 ohms

Yes – Go to FD4

No – Repair short in circuit

FD4

Install breakout box, leave processor disconnected.

Disconnect the BOO circuit at the 12 pin connector and measure the resistance between pins 2 and the 12 pin connector.

Is resistance greater then 5 ohms?

Yes – Service open cicuit

No – Go to shop manual group 32.

FD5 - Code 75

Check for damaged or corroded pins at processor

Install breakout box, leave processor disconnected, and measure voltage between pin 2 and 40 while depressing and releasing the brake pedal.

Does the voltage cycle?

Yes – Replace processor

No – Go to FD6

FD6

Install breakout box, leave processor disconnected.

Disconnect the BOO circuit at the 12 pin connector and measure the voltage between pins 2 and the engine block ground

Is voltage greater then 10.5 volts?

Yes – Service short circuit

No – Go to shop manual group 32.
 
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