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Code reader codes ????

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Old 06-05-2002, 02:44 PM
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Default Code reader codes ????

For those whom may have access to a mercruiser code reader where can you find the meaning of the codes, such as #42 & #43 ???? No one could answer this on the tech board, so now it's your chance. Codes on the net???? Where???
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Old 06-05-2002, 02:47 PM
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The codes #'s are listed in the merc shop manuals.
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Old 06-05-2002, 02:55 PM
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42=EST/BYPASS FAILURE TYPE 2 and applies only to 454/502 MPI's

That's all I could find.

Last edited by Baja Daze; 06-05-2002 at 03:05 PM.
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Old 06-05-2002, 03:12 PM
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???? I don't have Merc manuals !! I do have 454 Mag-MPI's !!

The code reader displays "ignition bypass failure" for code 42, so what does that mean????
I am seeing no or weak spark out of the coil, it won't start & a new coil &/or ecm does not fix it. ????
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Old 06-05-2002, 03:27 PM
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2.15.1 Code 42A

This portion of Malfunction Code 42 is intended to detect an open circuit in the EST wire between the ECM and HEI ignition module. This "Open Line" condition occurs when the EST monitor input indicates the EST signal was toggling while the ECM was commanding the EST bypass mode. The "Open EST Line" condition (code 42A) is detected when either of the following sets of conditions exist:

Condition 1

A.Malfunction code 42 logic is enabled, bit 0 of *KKMASKZ* is set.

B.The major loop of the EST Monitor is not enabled.

C.The minor loop of the EST Monitor is enabled.

Condition 2

A.Malfunction Code 42 logic is enabled.

B.Major Loop of EST Monitor is not enabled.

C.Minor loop of EST Monitor is not enabled.

D.The number of pulses on the EST line caused by electrical noise is greater than *KK42ACT*.

When the "open EST line" condition is detected, the diagnostic control logic will not allow the EST mode to be enabled.

This portion of malfunction code 42 logic is executed once each 12/5 msec until the first reference pulse has been detected, provided the entire code 42A logic has not been disabled by setting *KKMASK2* bit 0 equal to 0.

2.15.2 Code 42B

This portion of malfunction code 42 is intended to detail an open or grounded bypass line or a grounded EST line. This condition is detected under the following conditions:

1.Not in ALDL mode, Fuel backup mode or Spark backup mode.

2.Not in Factory test mode.

3.?QO msec time is enabled.

4.EST Major Loop Monitor is enabled.

5.Not in crank mode.

6.Engine speed greater than *KK42RM*.

7.No pulses received in the EST feedback counter.

8.This is the second consecutive occurrence of items 5, 6, and 7.

When the above conditions are met the EST logic will force the system into the bypass spark mode until the ignition switch is turned off.

Malfunction code 42 logic is executed once every 200 msec.

2.16 Code 43 - ESC Failure

Malfunction Code 43 will be detected when the following conditions are met:

Condition 1

1.The Knock A/D counts are greater than or equal to *KKM43ATH* or less than or equal to *KKM43ATL*.

2.M43ATIME is greater than *KK43ATIM*.

Condition 2

1.The Knock AID counts are greater than or equal to *KKM43ATH* or less than or equal to *KKM43ATL*.

2.The ESC input signal has been in the logic low state for a period of time greater than *KKESCP* during 3.9 second clock internal .

Malfunction code 43 logic shall be executed once every 3.9 seconds.

Malfunction Code 43 logic will be disabled when the ESC input signal has been in the logic low state for a period of time less than or equal to *KKSCP* during 3.9 second clock interval.

Last edited by Baja Daze; 06-05-2002 at 04:41 PM.
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Old 06-05-2002, 03:54 PM
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Nick,
Thanks alot !! Now I will spend a week trying to figure all the acronyms out & what they mean.

I guess I will have to order me some manuals...... but I have a Poker Run next saturday......hope I make it!
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Old 06-05-2002, 04:08 PM
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Tell me about it, that's some wordy stuff.

But sorry Bro, that's the best I could find and what I can gather, you may have a grounded or open condition in the Electronic Spark Timing (EST) circuit or Electronic Spark Control unit (ESC).
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Old 06-05-2002, 04:36 PM
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Nick,
That does narrow it down considerably. Thanks a lot.
Now to find the wiring diagram, etc....

Thanks!!
George
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