Pulling Codes - Page 3 - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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post #31 of 48 (permalink) Old 02-12-2018, 08:47 AM Thread Starter
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Originally Posted by Mark Kovalsky View Post
As was said above you can't have two digit and three digit codes in the same computer. It won't do that.

Can you post a video of the test?
How do I do that?

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post #32 of 48 (permalink) Old 02-12-2018, 09:46 AM
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Put the video on a hosting site such as YouTube and post a link to it.

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post #33 of 48 (permalink) Old 02-12-2018, 10:07 PM Thread Starter
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Ok here is a video of the test light codes

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post #34 of 48 (permalink) Old 02-12-2018, 10:32 PM
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I saw 11, 11, 1, 14, and 14.

11 means there was no error detected while the test was running. 1 is a separator between on demand codes and continuous codes. 14 means the engine RPM sensor that is used to control the transmission isn't working. It's either a bad sensor or a damaged wire to the sensor.

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post #35 of 48 (permalink) Old 02-12-2018, 11:58 PM
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Does the tach work?
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post #36 of 48 (permalink) Old 02-13-2018, 09:17 AM Thread Starter
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Does the tach work?
Occasionally, would that mean the tach needs to be replaced or could something else be causing it to malfunction? There are times when it is fine for long periods of time, although even when it works, the needle doesn't come off of zero till about 1/3 throttle.

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post #37 of 48 (permalink) Old 02-13-2018, 09:29 AM
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The tach sensor is located on the inj pump gear cover.

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post #38 of 48 (permalink) Old 02-13-2018, 11:34 AM Thread Starter
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Originally Posted by 0298PSD View Post
The tach sensor is located on the inj pump gear cover.
Thx!
I'm assuming the tach sensor is also the engine rpm sensor?

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post #39 of 48 (permalink) Old 02-13-2018, 12:35 PM
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Yes, the tach sensor provides the RPM signal to the TCM as well as the tach.
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post #40 of 48 (permalink) Old 02-13-2018, 01:10 PM Thread Starter
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Originally Posted by Mark Kovalsky View Post
I saw 11, 11, 1, 14, and 14.

11 means there was no error detected while the test was running. 1 is a separator between on demand codes and continuous codes. 14 means the engine RPM sensor that is used to control the transmission isn't working. It's either a bad sensor or a damaged wire to the sensor.
Wow I was way off on reading that code. Thank you for translating that code for me Mark.

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post #41 of 48 (permalink) Old 02-14-2018, 10:24 AM Thread Starter
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What modules does a 94 7.3 IDI F350 have? A supplier told me my truck has an IDM, PCM and a TCM. Is that right?

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post #42 of 48 (permalink) Old 02-14-2018, 10:54 AM
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‘94 is the year of 3 flavors
IDI non turbo
IDI Turbo
Power stroke (mid year).

You don’t have an IDM,

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post #43 of 48 (permalink) Old 02-14-2018, 11:05 AM Thread Starter
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Originally Posted by chuckster57 View Post
‘94 is the year of 3 flavors
IDI non turbo
IDI Turbo
Power stroke (mid year).

You don’t have an IDM,
The IDM must have showed up on the Powerstroke
Thx

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post #44 of 48 (permalink) Old 02-14-2018, 11:13 AM
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So the best thing you can do regarding parts or whatever if it's engine related, to avoid confusion say you have a '91 or '92.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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post #45 of 48 (permalink) Old 02-14-2018, 01:37 PM
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Quote:
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The IDM must have showed up on the Powerstroke
Thx
Correct. A critical feature of the IDI engine is that it's completely mechanically controlled. There are no "modules", because there would be nothing to connect them to. Manual trucks don't even have a diagnostic connector. The only exceptions are later vehicles with ABS and/or electronic cruise control. But ABS has no connection to the engine, and cruise control only connects to the throttle arm on the IP.

Quote:
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So the best thing you can do regarding parts or whatever if it's engine related, to avoid confusion say you have a '91 or '92.
A '91 is a different _truck_; ordering parts for it would be a bad idea. '92 also did not have a factory turbo. A '93 would be a closer match. Also, somewhere along that timeline, the belt drive switched from V-belt to serpentine.
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Last edited by madpogue; 02-14-2018 at 01:54 PM.
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