Injector “High to Low Side Open”
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Injector “High to Low Side Open”
Ive got the P1271, P1272, and P1277 codes after doing an injector buzz test. This is in my 1997 7.3 f350. I saw some threads on these but couldnt quite understand the troubleshooting methods. Could anyone help me out?
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Joined: Sep 2007
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From: Medford Oregon
How did the buzz test sound? They could be old codes stored, you need to clear them to be sure.
The codes simply mean the IDM reported a problem to the PCM at some time. High side is the middle wire on valve cover harness (the high voltage). The IDM will pulse each injector (low side), one each to the middle wire to fire them. If the IDM detects a high resistance on the operation it will throw those codes. I read your original post and sounds like a bad connection somewhere as different driving conditions seem to correct the issue. Don't know what brand parts you used but OEM are preferred when dealing at the valve cover areas.
The codes simply mean the IDM reported a problem to the PCM at some time. High side is the middle wire on valve cover harness (the high voltage). The IDM will pulse each injector (low side), one each to the middle wire to fire them. If the IDM detects a high resistance on the operation it will throw those codes. I read your original post and sounds like a bad connection somewhere as different driving conditions seem to correct the issue. Don't know what brand parts you used but OEM are preferred when dealing at the valve cover areas.
Thread Starter
|
Junior User
Joined: Jan 2016
Posts: 53
Likes: 0
How did the buzz test sound? They could be old codes stored, you need to clear them to be sure.
The codes simply mean the IDM reported a problem to the PCM at some time. High side is the middle wire on valve cover harness (the high voltage). The IDM will pulse each injector (low side), one each to the middle wire to fire them. If the IDM detects a high resistance on the operation it will throw those codes. I read your original post and sounds like a bad connection somewhere as different driving conditions seem to correct the issue. Don't know what brand parts you used but OEM are preferred when dealing at the valve cover areas.
The codes simply mean the IDM reported a problem to the PCM at some time. High side is the middle wire on valve cover harness (the high voltage). The IDM will pulse each injector (low side), one each to the middle wire to fire them. If the IDM detects a high resistance on the operation it will throw those codes. I read your original post and sounds like a bad connection somewhere as different driving conditions seem to correct the issue. Don't know what brand parts you used but OEM are preferred when dealing at the valve cover areas.
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