• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

P340 Code

  • Thread starter Thread starter Cdillon78
  • Start date Start date Nov 29, 2021
C

Cdillon78

New Member
Nov 22, 2021
2
0
1
Westland Michigan
Nov 29, 2021
#1
  • Nov 29, 2021
  • #1
Hello everyone, I am new member here. I am a long time mustang owner, I think I am somewhere around 10, which makes this more frustrating for me.

I recently picked up an 02 Roush. Car ran like crap, did a full tune-up like to any new-to-me vehicle. Ran the codes and found P0340 Cam Position Sensor Circuit Fault. I have a running parts car, so I swapped alternators and cam sensors with no change. Went and had the alternators tested and they came back good. I started to get into the harness to check the pigtails and see no issues there. I even ordered a new cam sensor just incase. Any pointers? I checked cylinder 5 COP connector and I and seen 5 volts, so I assumed there wasn't a break in the harness. Any help would be appreciated.
 

tsemmett

Active Member
Jul 2, 2019
276
33
38
US
Dec 16, 2021
#2
  • Dec 16, 2021
  • #2
A circuit fault would suggest there's a problem with one of the two wires to the cam sensor. I know on my 98 the cam sensor - runs through a shared signal ground wire, so I would assume the PCM is complaining about the + side. Either way, they both run to the large square connector on the passenger firewall and then to the PCM; grab a wiring diagram and a multimeter and test for continuity in each location. I suspect you'll find a short.
 
C

Cdillon78

New Member
Nov 22, 2021
2
0
1
Westland Michigan
Dec 16, 2021
#3
  • Dec 16, 2021
  • #3
Hey, thank you for the reply. I've been waiting for some help. I've checked for voltage coming out of the cam sensor and it moves between 3-4.7 volts. So, there is signal coming out. I've started to trace my way up the harness with no damage to be seen yet. I will take you advice and look there.
 
You must log in or register to reply here.

Similar threads

Electrical Issues with my 2006 mustang gt
  • VerneVdV
  • May 22, 2026
  • 2005 - 2009 Specific Tech
Replies
0
Views
35
2005 - 2009 Specific Tech May 22, 2026
VerneVdV
A
ECT sensor wires gone?? HELP
  • archer886
  • Oct 6, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
5
Views
293
1996 - 2004 SN95 Mustang -General/Talk- Oct 8, 2025
Mustang5L5
K
Engine 2000 Mustang GT - Fuel issue post-blown spark plug repair
  • kenster1092
  • Feb 26, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
285
SN95 4.6L Mustang Tech Mar 10, 2026
kenster1092
K
T
2002 V6 3.8L Help Me
  • TheIncompetentMechanic
  • Apr 4, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • 2 3
Replies
50
Views
668
1996 - 2004 SN95 Mustang -General/Talk- May 12, 2026
TheIncompetentMechanic
T
A
2020 Ford Mustang GT P0036, P0138, P0141 02 sensor help
  • AmkoA
  • Jul 29, 2025
  • 2015 - 2023 (S550) Mustang -General/Talk
Replies
1
Views
286
2015 - 2023 (S550) Mustang -General/Talk Aug 5, 2025
skkrtis
S
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?