i just did a buzz test with the aeroforce scan gauge that Jim was so nice to hook us up on and my truck came back with these 3 codes a p1272 p1274 p1293. anyone know what these codes mean or what causes them???

 

Do a search on this forum for post by afonda he has a post with dtcs for 7.3 engine. Hope this helps.

 

AB11 DIAGNOSTIC TROUBLE CODES (DTCs) P1271-P1278: CHECK FOR OPEN BETWEEN INJECTOR HIGH SIDE TO LOW SIDE AT VALVE COVER CONNECTOR
DTCs P1271-P1278 indicate a low side-to-high side open in the circuit between the IDM and the injector. The following table lists the circuits to inspect while performing these pinpoint tests, based on the DTC retrieved during the KOEO On-Demand or Injector Electrical Self Tests.
Note: If all of the DTCs associated with an entire bank are retrieved, the high side circuit is most likely open.



Cyl. DTC Low Side High Side Bank
1 P1271 555 (T) 1087 (O) Right
2 P1272 556 (W) 878 (PK/Y) Left
3 P1273 557 (BR/Y) 1087 (O) Right
4 P1274 558 (BR/LB) 878 (PK/Y) Left
5 P1275 559 (T/BK) 1087 (O) Right
6 P1276 560 (LG/O) 878 (PK/Y) Left
7 P1277 561 (T/R) 1087 (O) Right
8 P1278 562 (LB) 878 (PK/Y) Left


AB20 DIAGNOSTIC TROUBLE CODES (DTCs) P1294 AND P1293: CHECK FOR VOLTAGE ON HIGH SIDE CIRCUIT
DTCs P1294 and P1293 indicate an open circuit exists on the high side circuit between the IDM and the injectors. The following table lists the circuits to inspect while performing these pinpoint tests, based on the DTC retrieved during the KOEO On-Demand and Injector Electrical Self Tests.

DTC High Side Injector Bank
P1294 878 (PK/Y) Left
P1293 1087 (O) Right


Key off.
Disconnect both connectors on the bank with the code.
Key on, engine off.
Measure voltage on the suspect high side circuit Pin C on the injector vehicle harness connectors and battery ground.


May be an issue with injector solenoid or under valve cover wiring , or just burned connections

 

How does the truck run? I'm with Rick. Sounds like it will be time to pull the driver side valve cover and inspect the wiring or pins at the first sign of trouble.

Did all the injectors buzz where you could hear them? Most of the time we don't hear of any codes coming from the buzz test.

 

the truck runs but not lilke it should and yes all the injectors buzzed and i ran the test 3 times same thing every time. i have checked the wirng and all looks good and have unplugged the connector at the valve covers and got 3.2 ohms at the pins. i did have to replace a burnt harness like a year ago and replaced it with a doman product and it was put on the back 2 cylinders but from what i'm understanding is my problem is with cylinder 2 and 4. i tried to do a cylinder contribution test and got a po196 code