Neal Hilliard

I bought my 16yro son a 02 Gt. Bone stock except mufflers. Guy said he took a left hand turn and it just quit. I figured something simple so I purchased it. Throwing code P1235 fuel pump outta range. I tested the pump, fpdm, inertia switch and wire. No problem found. So just to be sure I also replaced everything. New pump, inertia switch, fpdm, ccrm and ECM. Still no pump. If I put power directly to it, pump fired right up. Load tested the wires between the ECM and FPDM, checked out fine. The dash lights and fog lights are out as well. Leads me to believe it may be a bad ground somewhere. I have checked the obvious ones in the trunk and by the ECM. Is there a possibility(I'm sure I am) I'm overlooking one and where could I find a diagram of there locations and wiring schematics. Haynes didn't help and I've found nothing online. It's not the PATS system. Please help, his birthday was March 1st and he still has a yard ornament. My ex wife is really on my *** and I've exceeded what I planned to spend by about $1,800. I bought mods before I had it running. I know I know, but I wanted him to have a nice ride. He's in high school with a bunch of well off kids who are all driving Mustangs and Camaros who are constantly giving the less fortunate kids crap and now days you can't just hit em in the mouth. Was trying to give him a way to hit em just in the ego. Anyhow, I desperately need some help cause I'm the one making him and myself look bad.

dawson1112

Did you check all the fuses? Under hood and under dash.

It sounds similar to a problem I had with a chevy venture, engine would crank, but no fuel and no spark no check engine/abs/oil lights on initial key on. It turned out that the fusible link between the 12v constant to the PCM was burnt.

Try and track down the pin out of the PCM and look for the constant 12 and test.

Some one on here may be able to help you get the pinout and diagram for the PCM.

Camster

Doubtful that it's the problem,but I would replace the fuel filter on any used Mustang,and especially one that just got a new fuel pump.

Ignore the well off kids and their rides.... a pointless,short term exercise in trying to match someone in something as foolish as "things". Just get better grades.

WJL

Beware this is from the internet also see attached

1996-98 4.6L 1999-04 4.6L PIN 1996-98 4.6L 1999-04 4.6L

1 on Plug #6
2 MIL
3 GND
13 DLC PWR pin 13 DLC PWR pin 13
15 DLC (-) pin 10 DLC (-) pin 10
16 DLC (+) pin 2 DLC (+) pin 2
21 Crank Sensor (+) Crank Sensor (+)
22 Crank Sensor (-) Crank Sensor (-)
23 L Knock Sensor (-) (DOHC only)
24 GND
25 GND GND
26 Coil #1 (cyl 1 & 6) Coil on Plug #1
27 Coil on Plug #5
32 L Knock Sensor (DOHC only) R Knock Sensor (-) (DOHC only)
33 GND
36 MAF RTN MAF RTN
38 ECT ECT
39 ACT ACT
40 FPM FPM
46 E-Fan High E-Fan High
48 Tach
51 GND GND
52 Coil #2 (cyl 3 & 5) Coil on Plug #3
53 Coil on Plug #4
55 KAM PWR KAM PWR 57 R Knock Sensor (DOHC only) R Knock Sensor (+) (DOHC only)
58 VSS
60 R HEGO R HEGO
68 VSS 71 PWR PWR
72 Injector #7 Injector #7
73 Injector #5 Injector #5
74 Injector #3 Injector #3
75 Injector #1 Injector #1
76 GND
77 GND GND
78 Coil #3 (cyl 4 & 7) Coil on Plug #7
79 Coil on Plug #8
80 FP Relay FP Driver
83 IAB IAB
85 CAM Sensor CAM Sensor
87 L HEGO L HEGO
88 MAF MAF
89 TPS TPS 90 V-REF V-REF
91 SIG-RTN SIG-RTN
93 RF HEGO Heater GND RF HEGO Heater GND
94 LF HEGO Heater GND LF HEGO Heater GND
97 PWR PWR
98 Injector #8 Injector #8
99 Injector #6 Injector #6
100 Injector #4 Injector #4
101 Injector #2 Injector #2
102 L Knock Sensor (+) (DOHC only)
103 GND GND
104 Coil #4 (cyl 2 & 8 ) Coil on Plug #2

Neal Hill

Yeah, I found 1 blown fuse. Replaced it, nothing. I did replace the filter as well. I have the pin out diagram and every other plug pin out. But can't find nothing telling me where they ground to. Even though there's a ground in the trunk by the fpdm I was told the fuel pump has a ground under the console. Not sure why because the ecm sends a ground signal to to make it come on. It has got to be a bad wire somewhere. And the fact that all 3 went at the same time. And I know, I've never been one to keep up with the Jones's. But when you've got a son who busts his butt to make good grades, never gets in trouble, is respectful as he is to others and tries as hard as he does to just fit in. Ill eat Ramen noodles 7 days a week if i got to to give him any advantage I can. High school sucks for some, you where either top of the food chain or food. Its worse now than it ever was in my day. I just cant let him be looked down on because of my choices in life.