Question about 1995 Ford Contour

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Bad engine wiring harness makes my vehicle not even wanna start

Welll its the engine harness that is shortin out.it causes the pcm to blow. ford said this problem is common in these cars.ok. but what if i had the harness completely re wired with bigger wires from each connector to pigtal. would the harness work. again or do u think it would fail

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I think you're best off getting a replacement harness - rewiring the harness is probably too much work and you don't really want to go messing with the resistances of the wiring.

Just my opinion,
Sherwin

Posted on Dec 13, 2009

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I think thats a great idea to rewire the harnes and use the existing plastic connectors, and replace the pig tails, it would save you allot of money in the long run, cause a new wiring harness can run more then $350,00.... So I say great idea, plus the satisfaction of fixing something ones self is quit rewarding! Have fun and God Bless You this New Year! We need to become more independant with our veicals! Truly Jasen

Posted on Jan 12, 2010

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1 Answer

Check engine light stays on after ignition turned off


MALFUNCTION INDICATOR LAMP (MIL) ALWAYS ON: CHECK MIL CIRCUIT FOR SHORTS TO GROUND IN wiring HARNESS .
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  • If any Key On Engine Off or Continuous Memory Diagnostic Trouble Codes are present, repair before proceeding.
  • Disconnect PCM.
  • Measure resistance between PCM harness connector Pin 2 and PCM harness connector Pin 51 or 103.
Is resistance less than 5.0 ohms? Yes No REPAIR short circuit. REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ).
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This is one you need to take to a repair shop , need to hook up scan tool to see if you can turn off an on check engine light , could have a wiring problem , cluster or engine computer problem !

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Ford 99 Taurus ignition fuse keeps blowing every time key is turned


A bad something, yes.
The fuse may be the primary fuse for the key switch. If it is, you would need to disconnect the key switch harness and check for a short to ground on each circuit.

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1995 ford ranger pcm blowing


It's the fuse for the engine computer, anyway, don't know what else. But it could be a bad computer, or more likely, a short in the wiring to the computer. Pull off the connector to the computer and start checking wires for melted insulation, or a broken wire. Pull off the negative battery cable and run continuity checks on the power wires to the computer. You may have to pull some of the engine harness apart to check wiring-it can be very tedious-if you can't find any bad wiring, a short, then it may be a shorted computer.

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I have a 2003 ford taurus 3.0 engine and everytime i use the ac or heat i blow a fuse and engine light comes on with p1633 code


Put OBD2 P1633 into google for the answer

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2001 Ford Escape 3.0L V6 Engine Code P1409


Had this code for over 2 years on my 02 escape. FINALLY, found the solution. DONT replace your egr vacuum solenoid (unless you see broken pins on the connector). You can always test the solenoid to see if it still works if you suspect the solenoid is the culprit. Rather, most likely the problem will be in your electrical harness that connects from the solenoid to the pcm. I had no visible broken wires. However, in my case, my female connector harness that plugs into the solenoid was faulty. Replaced it by soldering the wires from a "new" harness that i got from the junk yard. If this fails for you, the problem will be almost guaranteed to be in either your pcm hardware or a broken pin at the pcm connection.

May 08, 2012 | 2001 Ford Escape

1 Answer

Vehicle idle very low code p0505 said idle system control problem what part can b bad and check engine light is on


Causes: Potential causes of an P0505 code include:
* IAC motor connector is damaged (check connector and pins for damage, and moisture)
* One or more IAC circuits open or shorted to ground
* One or more IAC circuits are shorted to voltage
* IAC has failed
* PCM has failed

Possible Solutions:
* This should be a fairly straightforward diagnosis. Start by clearing the fault codes. Then unplug the IAC and start the engine (This may cause other IAC codes to set. Just ignore them for now). If the P0505 code doesn't reset, replace the IAC. It is internally shorting one of the IAC circuits. If the code DOES return after unplugging the IAC and starting the engine, then you know it isn't the IAC motor. Visually check the wiring harness all the way back to the PCM. You may need to visually inspect the harness by removing all the insulation off the wires. It is possible that the wires could be shorting to eachother or to other wires in the harness.

* If there are no wiring problems, and the code keeps returning with the IAC unplugged, you can check the PCM by removing the IAC wires from the PCM connector (or clipping the wires in a location where they can be repaired easily) and then start the engine (If you're not sure, don't do it. Take it to a qualified professional). Now if the code doesn't reset there is a problem with the wiring. Check for continuity on all the IAC wires. Any resistance points to a problem. Check for voltage on any(At this point there shouldn't be any voltages on the wires because they're clipped at one end and unplugged at the IAC). Repair as necessary. But if the P0505 code DOES reset after removing the IAC wires from the PCM connector(or clipping them), replace the PCM, there's a problem internally on the IAC control circuit.

Hope helps (remember to rate and comment this).

Dec 24, 2010 | 2000 Chevrolet Prizm

1 Answer

Ford f250 2002 idm relay clicking will not start


PCM maybe loosing voltage may have caused Engine control Fuse #22
to blow open. IDM injector Driver module could have loose or open harness connetors. IDM relays gets its ground thru the PCM ground circuit. When this happens it cycles the ground side of the relay trigger coil switch.

Feb 22, 2010 | 2000 Ford F350 Super Duty Super Cab

1 Answer

Check engine lite is on, power lost lite is on. code p1276comes up. replaced throttle body, but no change. volts at vac fuse 14 both sides. will not accelerate over 1800 rpm's. 2004 trailblazer with 6cyl.


Your CODE P1276 refer to the Acelerator Pedal Position, Sensor 1 Circuit Range Performance.

Probable cause: Wiring, APP or ECM


GM - P1271 Accelerator Pedal Position Sensor 1-2 Correlation

I also found this... though its for Trailblazers... but may give you a clue:
Reduced Engine Power Message and/or Check Engine Light with any Combination of the following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682 #PIP3192 - (Oct 18, 2004)

Reduced Engine Power Message and/or Check Engine Light with any Combination of the Following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682 PCM Repeat.

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:
Reduced engine power message and/or check engine light with any combination of the following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682

Recommendation/Instructions:
If the SI diagnostics did not isolate a concern, the following information may be helpful:
- Inspect the main engine wiring harness between the PCM and the generator assembly for a potential short to ground. There is a metal wiring harness retainer in this area that secures the main engine harness. If the harness conduit is mispositioned, some of the wiring may become exposed and chaff on the harness retainer. This may eventually cause the exposed circuit to short to ground.

- Inspect the 3 harnesses that connect to the PCM for potential shorts to ground on the metal PCM mounting bracket, just below the PCM. There are plastic harness retainers on the PCM bracket that secure the harnesses to the PCM bracket. If the harness conduit is mispositioned, some of the wiring may become exposed and chaff on the PCM bracket. This may eventually cause the exposed circuit to short to ground.

- If a chaffed circuit is found in either of the above locations, repair the circuit using the necessary SI procedures. Once the circuit is repaired, tape the area of the affected area of the harness to prevent the wires from becoming exposed in the future and secure the harness using the original harness retainer.

This applies to 04:
- 4.2L 5.3L LL8 LM4 Engine with DTC - P2120 or P2122 or P2123 or P2125 or P2127 or P2128 - kw low MIL pedal power reduced #PI01746 - (Feb 17, 2004)
- 4.2L 5.3L LL8 LM4 Engine with DTC - P2120 or P2122 or P2123 or P2125 or P2127 or P2128.

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
MIL light on. Reduced Power message on DIC. Possibles DTCs P2120 and/or P2122, P2123, P2127, and P2128.

Recommendation/Instructions:
The APP harness is clipped to the accelerator pedal bracket. The harness may chaff on the upper portion of the accelerator pedal causing a short to ground. Verify the harness is not chaffing on the accelerator pedal. After repairing the short, reposition the harness to ensure no contact between the harness and the accelerator pedal.

Hope helpes.

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1 Answer

Eec fuse keeps blowing on mercury mystique


When you go to wide open throttle, the only thing that happens is your a/c cut out is activated by the throttle position sensor. I owuld check there, but it is very rare that the TPS would cause a fuse to blow.
You may have an engine wire harness that has the wiing insulation decomposing causing wires to short against each other. Peel open the plastic convolute and look for cracks in the insulation. Here is info on a Ford program to repair if less than 100,000 miles on your car.

October, 1999
To:
All Ford and Lincoln-Mercury Dealers
Subject:
Owner Notification Program 99M03 - Certain 1995-1997 Contour and Mystique vehicles - Under Hood Wire Harness - Additional Coverage.
PROGRAM TERMS:
This program provides extended coverage on certain under hood wire harnesses through 10 years or 100,000 miles which ever occurs first, from the original warranty start date. AFFECTED VEHICLES
Certain 1995 - 1997 Contour and Mystique vehicles built from Job #1 1995 through Model Year End 1997. REASON FOR RECALL
Under ambient factors of high temperature and high humidity, certain 1995 - 1997 Contour and Mystique vehicles may be susceptible to the wiring insulation becoming brittle and cracking on certain engine compartment wiring harnesses. These harnesses deliver electrical power to the engine and its cooling and control systems, the climate control, and other power distribution systems. If wire harness insulation cracking is found during the additional warranty period, the under hood wire harnesses are to be replaced at no charge to the customer. SERVICE ACTION
Additional Warranty Coverage
Effective immediately, Ford is providing additional coverage for the replacement of the under hood wire harnesses on these vehicles for a period of 10 years or 100,000 miles, which ever occurs first, from the original warranty start date. This coverage exceeds the provisions of the original component warranty coverage on the affected vehicles and is automatically transferred to subsequent owners at no charge. This additional coverage does not include normal service diagnostic or repair charges unrelated to wire harness brittleness and cracking. After this additional coverage has expired, wire harness replacements will be at the expense of the vehicle owner.

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Dec 09, 2008 | 1995 Mercury Mystique

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