I ran the codes on my car today and I think I figured them out, however I would like a second opion on them.
First code 18 C - I have had this code for at least a year and a half. At first I replaced the TFI module but with no luck. Today I unhooked the wiring harness from the TFI module and the computer. I did a continuity test from all the wires that run from the TFI module to the computer, they all gave me 1 ohm except for the dark green / yellow IDM circuit (pin 4), which said it was open. Now I know there is a 22K ohm resistor in this circuit, but where? IS it in the car or in the engine bay? I know that the break is in between the resistor and the computer, because i got a reading of 1 ohm between the TFI connector and the coil connector on this wire.
Am I on the right track with this? Will this give me a drivablity problem, because I have had intermitint performace and gas mileage problems for about a year.
29 C - vehicle speed sensor, I checked for continuity between pins 3 and 6 on the harness and got a reading of 207 ohms. Next I checked the lines individualy and they both read out at 1 ohm each. So I feel that it is the VSS am I correct with this. BTW I used this for a diagram http://www.veryuseful.com/mustang/tech/engine/images/88-91eecPinout.gif
96 C
Wasn't sure what to do with this so I checked for continuity between pins 37 and 22 on the computer and it gave me 62 ohms. I know that this circuit runs through the coil of a relay so is this reading any good?
This is what the code is
Fuel Pump Circuit Open-Battery To PCM (Others)
So I would assume at one point the fuel pump relay opened up while the car was running and this created an open connection between the battery and pin 22. So I guess that code mean that either there is a loose connection, or either the fuel pump relay, inertia fuel pump switch, or eec power relay is going bad.
Am I right or wrong with this?
Thanks for the help.
Mario
First code 18 C - I have had this code for at least a year and a half. At first I replaced the TFI module but with no luck. Today I unhooked the wiring harness from the TFI module and the computer. I did a continuity test from all the wires that run from the TFI module to the computer, they all gave me 1 ohm except for the dark green / yellow IDM circuit (pin 4), which said it was open. Now I know there is a 22K ohm resistor in this circuit, but where? IS it in the car or in the engine bay? I know that the break is in between the resistor and the computer, because i got a reading of 1 ohm between the TFI connector and the coil connector on this wire.
Am I on the right track with this? Will this give me a drivablity problem, because I have had intermitint performace and gas mileage problems for about a year.
29 C - vehicle speed sensor, I checked for continuity between pins 3 and 6 on the harness and got a reading of 207 ohms. Next I checked the lines individualy and they both read out at 1 ohm each. So I feel that it is the VSS am I correct with this. BTW I used this for a diagram http://www.veryuseful.com/mustang/tech/engine/images/88-91eecPinout.gif
96 C
Wasn't sure what to do with this so I checked for continuity between pins 37 and 22 on the computer and it gave me 62 ohms. I know that this circuit runs through the coil of a relay so is this reading any good?
This is what the code is
Fuel Pump Circuit Open-Battery To PCM (Others)
So I would assume at one point the fuel pump relay opened up while the car was running and this created an open connection between the battery and pin 22. So I guess that code mean that either there is a loose connection, or either the fuel pump relay, inertia fuel pump switch, or eec power relay is going bad.
Am I right or wrong with this?
Thanks for the help.
Mario