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  #1  
Old 09-29-2011, 01:36 PM
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Another no start issue

OK:
I have a 2001 7.3L with a no start issue. Had bad PCM, replaced ran great for about 7 miles then the truck shut off. No restart. HPOP is full, unplugged ICP sensor (oily) still no start. Replaced fuel filter. I have fuel bowl delete. Changed out CPS. Tach and oil work on cranking. EDGE is disconnected and has been from the PCM replace. Getting angry and going blind from reading... Help please.
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Old 09-29-2011, 03:17 PM
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Does the WTS light come on when you first roll-on the key?

All the fuses OK? (especially 30-19-21)
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Old 09-30-2011, 06:45 AM
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I agree start with the easy stuff. Sounds to me like you trashed some $$$ on a new PCM when it may not be your problem, dibs on the old one.
Do you have a WTS light?
Is it cranking? Do you have fuel?
Do you have any way to monitor oil pressure?
Let's not get ahead of ourselves.
For faster reply you can PM me if you want.
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Old 10-04-2011, 11:26 AM
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Sorry for the delayed response.
Yes the WTS light comes on and then goes off as should.
The PCM was throwing error code as faulty.
Oil pressure is good. Fuel is good. Had mechanic check oil and fuel.
Fuses are OK. Checked them several times....
Buddy had spare IDM. Hooked that up still no start.
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Old 10-22-2011, 09:58 AM
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I have a very similar issue.

Drove to work.
Won't start 12 hrs later.
Change Fuel filter.
Checked fuses.
PCM will not communicate with Snap-on Modis or Matco computer.
Replaced PCM after programming with VIN and mileage.
Still no start. Code 1268
Purchased salvage IDM. (Same number.)
Still no start.
Going to buy CPS. don't expect it to help. Shotgunning it at this point.
What did you do to fix it?
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  #6  
Old 10-22-2011, 11:07 AM
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Mine was a 2 part fix. My original issue caused my 2nd issue. Just to get it started I had to replace my IDM. Even though I tested it with a buddies spare IDM. Seems as though his IDM was shot too. Once it was running still had the original issue. Which turns out was the PCM resetting itself.
Seems as though a shorted or grounded vREF wire will do that.... I think mine was from the ICP sensor plug was filled with oil. Sprayed elec cleaner on it and no issue. fingers crossed...
Sounds like you have similar issue (P1268 High to Low Side Short - Cylinder 8) could be bad wire somewhere. put old IDM back in clear codes see if you get same code. If yes then bad wire somewhere, if not then both IDM may be bad.

AB6 DIAGNOSTIC TROUBLE CODES (DTCs) P0262, P0265, P0268, P0271, P0274, P0277, P0280, P0283 and P1261-P1268: CHECK FOR SHORT TO B+ OR TO HIGH SIDE IN THE LOW SIDE CIRCUIT

* DTCs P1261-P1268 indicate that the low side circuit is shorted to B+ or the high side circuit between the IDM and the injector. The following table lists the circuits to inspect while performing these pinpoint tests, based o the DTC retrieved during the KOEO On-Demand or Injector Electrical Self Tests.

Cyl. DTC Low Side High Side
1 P1261-P0262 555 (T) 1087 (O)
2 P1262-P0265 556 (W) 878 (PK/Y)
3 P1263-P0268 557 (BR/Y) 1087 (O)
4 P1264-P0271 558 (BR/LB) 878 (PK/Y)
5 P1265-P0274 559 (T/BK) 1087 (O)
6 P1266-P0277 560 (LG/O) 878 (PK/Y)
7 P1267-P0280 561 (T/R) 1087 (O)
8 P1268-P0283 562 (LB) 878 (PK/Y)

* Key on/engine off.
* Disconnect IDM.
* Disconnect both connectors on the bank with the code.
* Measure resistance between the low side and battery positive post, then to high side at the injector valve cover connector. Refer to injector illustration at beginning of this pinpoint test for pin location.

Are both resistance readings less than 10,000 ohms?
Yes No
GO to AB7 . REPAIR short in circuits between IDM and injector valve cover connector. RERUN Scan Tool Diagnostic Test.
AB7 CHECK FOR SHORT INTERNAL TO VALVE COVER

* Key off.
* Install Rotunda Glow Plug Injector Adapter 014-00935 or equivalent to valve cover gasket.
* Measure resistance between high side and low side circuits.

Is resistance less than 2.0 ohms on a cold engine?
Yes No
GO to AB8 . Fault may be intermittent. GO to AB10 .
AB8 CHECK FOR SHORT UNDER VALVE COVER

* Key off.
* Remove valve cover.
* Disconnect injector connector.
* Measure resistance between Rotunda Glow Plug Injector Adapter 014-00935 or equivalent and injector connector on both high and low side circuits.

Is resistance greater than 10,000 ohms?
Yes No
REPLACE injector. RERUN Scan Tool Diagnostic Test. GO to AB9 .
AB9 GASKET HARNESS OR UVC SHORT LOW SIDE TO HIGH SIDE

* Remove UVC harness.
* Measure resistance between gasket harness low side and high side circuitry.

Is resistance less than 5 ohms?
Yes No
REPLACE gasket harness. RERUN Scan Tool Diagnostic Test. REPLACE UVC harness. RERUN Scan Tool Diagnostic Test.
AB10 CHECK FOR INTERMITTENT LOW SIDE SHORT TO B+ OR HIGH SIDE

* Key on/engine off.
* IDM disconnected.
* All four valve cover connectors disconnected.
* Using a digital multimeter and the flex tips supplied with the NGS Tester, measure resistance between the suspect injector low side circuit and battery positive post, then to high side circuit on the IDM connector. Refer to injector illustration at the beginning of this pinpoint test for pin location.
* Grasp the harness close to the suspect injector connector. Wiggle and shake harness while working toward the IDM.

Do either resistance readings ever drop below 10,000 ohms?
Yes No
ISOLATE shorted circuit and REPAIR. CLEAR DTCs and RETEST. IDM internal failure. REPLACE IDM.
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  #7  
Old 10-24-2011, 05:24 PM
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OP have you changed out the ICP sensor? Being filled with oil is a good sign its going out. Better now than letting it strand you out on the road.
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