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14 Posts
I have an 07 mustang 4.6 I had a p0202 code and replaced the #2 injector. Then I had a p203 code so I replaced the rest of them. Now I have a p0202, p203, and a p303 code I would appreciate any advice
Fuel injectors
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195 Posts
What kind of shape is your battery and charging system in?
Sometimes a failing battery or alternator (diodes too) can cause issues with the PCM.
Also check and clean battery terminals and grounds along with the ground strap from the engine to body or battery.
Sometimes a failing battery or alternator (diodes too) can cause issues with the PCM.
Also check and clean battery terminals and grounds along with the ground strap from the engine to body or battery.
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14 Posts
Battery and alternator good and so is the ground strap
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195 Posts
Could have gotten a faulty injector or 2.
One thing I do is I'll unplug whatever injector while it's running and note any difference in rpms.
Another thing is I'll swap out a known working injector like #1 with #2 and see if anything changes.
If it stays the same on codes and the way it runs, then the problem is with the connection either at the injector and/or the circuit supplying it.
If the code changes to show #1 is bad and #2 is good, then the problem is likely with the injector. You can do this with the #3 as well.
I'm leaning towards a poor connection somewhere, i.e. a bad ground. This is where a volt/ohm meter comes in.
The P303 will likely clear up once you get the the other codes taken care of.
One thing I do is I'll unplug whatever injector while it's running and note any difference in rpms.
Another thing is I'll swap out a known working injector like #1 with #2 and see if anything changes.
If it stays the same on codes and the way it runs, then the problem is with the connection either at the injector and/or the circuit supplying it.
If the code changes to show #1 is bad and #2 is good, then the problem is likely with the injector. You can do this with the #3 as well.
I'm leaning towards a poor connection somewhere, i.e. a bad ground. This is where a volt/ohm meter comes in.
The P303 will likely clear up once you get the the other codes taken care of.
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195 Posts
Don't have one of those...yet, still doing it the old fashioned way.
May just have to get one. Bet it makes testing much faster.
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14 Posts
Left side no difference unplugging any injector. Rt side lots of difference
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195 Posts
Check your connectors. R.S.Logans' (#7) post above yours is a cheap easy way to do it.
You may have gotten a bad batch of injectors.
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14 Posts
Power to all 4 on Left side by test light not sure how that 194 works
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195 Posts
I would try a few of the old known working injectors. Also, make sure your coils and plugs are firing.
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195 Posts
It's also known as a poor mans noid light. You take a 194 bulb like the one below, commonly used in older cars in the instrument clusters and marker lights, straighten out the terminals so they can contact the inside of an injector plug. Like using a test light but a little easier.
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19,496 Posts
Check all fuses in any way related to possible cause , especially the Powertrain Control Module and also all wiring / connections and any ground wires
Fuse Layout Ford Mustang 2005-2009
2007
Passenger compartment
![Interior fuse box diagram: Ford Mustang (2007)]()
Assignment of the fuses in the Passenger compartment (2007)
Engine compartment
![Under-hood fuse box diagram: Ford Mustang (2007)]()
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Assignment of the fuses in the Power distribution box (2007)
Fuse Layout Ford Mustang 2005-2009
2007
Passenger compartment
Assignment of the fuses in the Passenger compartment (2007)
| № | Amp Rating | Description |
|---|---|---|
| 1 | Mini relay | Accessory delay #1 |
| 2 | — | Not used |
| 3 | 10A | Wiper power/Blower motor relay |
| 4 | 5A | Power mirrors |
| 5 | — | Not used |
| 6 | 5A | Accessory delay feeds |
| 7 | 10A | Electrochromic mirror |
| 8 | 10A | Cluster, Data Link Connector (DLC) |
| 9 | — | Not used |
| 10 | 5A | Intrusion Sensing Module (ISM), Climate control |
| 11 | — | Not used |
| 12 | 5A | Climate control, Ignition |
| 13 | — | Not used |
| 14 | 5A | A/C cycle switch |
| 15 | 10A | Brake On/Off (BOO) power |
| 16 | 5A | Cluster |
| 17 | 10A | Restraint Control Module (RCM), Passenger Occupant Detection System (PODS), Passenger Air bag Deactivation Indicator (PADI) |
| 18 | 10A | Anti-lock Brake System (ABS) |
| 19 | 5A | Powertrain Control Module (PCM) relay, Passive Anti-Theft System (PATS), Instrument cluster airbag warning lamp |
| 20 | 10A | Radio (Start) |
| 21 | 10A | Starter relay |
Engine compartment
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Assignment of the fuses in the Power distribution box (2007)
| № | Amp Rating | Description |
|---|---|---|
| 1 | — | Not used |
| 2 | 30A* | Climate control blower |
| 3 | 40A* | Cooling fan |
| 4 | 30A* | Starter |
| 5 | 30A* | Driver front window motor |
| 6 | 30A* | Rear amplifier (Shaker 1000 radio) |
| 7 | 30A* | Passenger front window motor |
| 8 | 40A* | Anti-lock Brake System (ABS) #1 |
| 9 | 30A* | Rear amplifier (Shaker 1000 radio) |
| 10 | 30A* | Wipers |
| 11 | 30A* | Driver rear window motor (Convertible only) |
| 12 | 30A* | Passenger rear window motor (Convertible only) |
| 13 | 40A* | Convertible top |
| 14 | 30A* | Driver seat |
| 15 | 30A* | Passenger seat |
| 16 | 30A* | Front amplifier (Shaker 500 radio) |
| 20 | Mini relay | PCM |
| 21 | Micro relay | Fuel pump |
| 22 | Mini relay | Starter |
| 23 | — | Not used |
| 24 | Micro relay | A/C clutch |
| 25 | Mini relay | Cooling fan (High-speed) |
| 26 | Mini relay | Horn |
| 27 | Micro relay | High beams |
| 28 | Mini relay | Cooling fan (Low-speed) |
| 29 | Mini relay | Rear defroster |
| 30 | Micro relay | Fog lamps |
| 31 | Mini relay | Convertible top (Up) |
| 32 | Mini relay | Climate control blower |
| 33 | Mini relay | Convertible top (Down) |
| 34 | Micro relay | Decklid |
| 39 | 15A** | Engine #4 |
| 40 | 15A** | Engine #2 |
| 41 | 15 A** | Fuel pump |
| 42 | 15 A** | Engine #3 |
| 43 | 10A** | Alternator |
| 44 | 10A** | Delayed accessory |
| 45 | 10A** | PCM |
| 46 | 25A** | Horn |
| 47 | 15 A** | Engine #1 |
| 48 | Diode | A/C clutch |
| 49 | 15 A** | A/C clutch |
| 50 | 15A** | High beams |
| 51 | 10A** | Convertible top |
| 52 | 30A** | Rear defroster |
| 53 | Diode | PCM |
| 54 | — | Not used |
| 55 | — | Not used |
| 56 | 20A** | Radio, SDARS |
| 57 | 20A** | Decklid release |
| 58 | 15A** | Fog lamps |
| 59 | 30A** | SJB #5 (Passenger compartment fuse box) |
| 60 | — | Not used |
| 61 | 20A** | Power point #1 (Instrument panel) |
| 62 | 20A** | SJB #7 (Passenger compartment fuse box) |
| 63 | 30A** | SJB #6 (Passenger compartment fuse box) |
| 64 | 20A** | Power point #2 (Console) |
| 65 | 30A** | ABS #2 |
| 66 | 25A** | Heated seats |
| 67 | 30A** | SJB #4 (Passenger compartment fuse box) |
| 68 | 20A** | Ignition |
| * Cartridge Fuses ** Mini Fuses |
Joined
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14 Posts
Is there any way to check the timing without taking the engine apartCheck all fuses in any way related to possible cause , especially the Powertrain Control Module and also all wiring / connections and any ground wires
Fuse Layout Ford Mustang 2005-2009
2007
Passenger compartment
![Interior fuse box diagram: Ford Mustang (2007)]()
Assignment of the fuses in the Passenger compartment (2007)
№ Amp Rating Description 1 Mini relay Accessory delay #1 2 — Not used 3 10A Wiper power/Blower motor relay 4 5A Power mirrors 5 — Not used 6 5A Accessory delay feeds 7 10A Electrochromic mirror 8 10A Cluster, Data Link Connector (DLC) 9 — Not used 10 5A Intrusion Sensing Module (ISM), Climate control 11 — Not used 12 5A Climate control, Ignition 13 — Not used 14 5A A/C cycle switch 15 10A Brake On/Off (BOO) power 16 5A Cluster 17 10A Restraint Control Module (RCM), Passenger Occupant Detection System (PODS), Passenger Air bag Deactivation Indicator (PADI) 18 10A Anti-lock Brake System (ABS) 19 5A Powertrain Control Module (PCM) relay, Passive Anti-Theft System (PATS), Instrument cluster airbag warning lamp 20 10A Radio (Start) 21 10A Starter relay
Engine compartment
![Under-hood fuse box diagram: Ford Mustang (2007)]()
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Assignment of the fuses in the Power distribution box (2007)
№ Amp Rating Description 1 — Not used 2 30A* Climate control blower 3 40A* Cooling fan 4 30A* Starter 5 30A* Driver front window motor 6 30A* Rear amplifier (Shaker 1000 radio) 7 30A* Passenger front window motor 8 40A* Anti-lock Brake System (ABS) #1 9 30A* Rear amplifier (Shaker 1000 radio) 10 30A* Wipers 11 30A* Driver rear window motor (Convertible only) 12 30A* Passenger rear window motor (Convertible only) 13 40A* Convertible top 14 30A* Driver seat 15 30A* Passenger seat 16 30A* Front amplifier (Shaker 500 radio) 20 Mini relay PCM 21 Micro relay Fuel pump 22 Mini relay Starter 23 — Not used 24 Micro relay A/C clutch 25 Mini relay Cooling fan (High-speed) 26 Mini relay Horn 27 Micro relay High beams 28 Mini relay Cooling fan (Low-speed) 29 Mini relay Rear defroster 30 Micro relay Fog lamps 31 Mini relay Convertible top (Up) 32 Mini relay Climate control blower 33 Mini relay Convertible top (Down) 34 Micro relay Decklid 39 15A** Engine #4 40 15A** Engine #2 41 15 A** Fuel pump 42 15 A** Engine #3 43 10A** Alternator 44 10A** Delayed accessory 45 10A** PCM 46 25A** Horn 47 15 A** Engine #1 48 Diode A/C clutch 49 15 A** A/C clutch 50 15A** High beams 51 10A** Convertible top 52 30A** Rear defroster 53 Diode PCM 54 — Not used 55 — Not used 56 20A** Radio, SDARS 57 20A** Decklid release 58 15A** Fog lamps 59 30A** SJB #5 (Passenger compartment fuse box) 60 — Not used 61 20A** Power point #1 (Instrument panel) 62 20A** SJB #7 (Passenger compartment fuse box) 63 30A** SJB #6 (Passenger compartment fuse box) 64 20A** Power point #2 (Console) 65 30A** ABS #2 66 25A** Heated seats 67 30A** SJB #4 (Passenger compartment fuse box) 68 20A** Ignition * Cartridge Fuses
** Mini Fuses
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