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Austin James Posted on Jul 01, 2017

Engine Control Module/relay?

I recently had a short with my headlight switch which caused a small amount of smoke/damage to some wires. I have fixed all wires that are important (so I thought) and my car starts and runs. My issue is now when driving, my gas pedal will no longer work under load. It is shifting thru gears, but at around 3-4k rpms (in any gear) it will loose power. It does not loose power in neutral when revving the engine, only in gear under load.

5 Related Answers

Anonymous

  • 7 Answers
  • Posted on Jan 21, 2009

SOURCE: 05 Golf TDI sudden loss of power. Turbo issue?

ecu problem! go and find someone with VAG-COM and get it checked for fault codes. glad i could help!

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Anonymous

  • 1 Answer
  • Posted on Jul 14, 2009

SOURCE: 2001 Jetta automatic - won't up-shift

Hi ,
I have a 2002 hetta and i had same problem. The problem is with the N92 selenoid. My machanic changed it last week and now everything is normal.
Check this forum.
http://forums.vwvortex.com/zerothread?id=4188370&page=1
Good luck,
Sam.

Anonymous

  • 521 Answers
  • Posted on Jul 19, 2009

SOURCE: gear shift won't move out of park

safety switch on brake pedal. common cause is a wire breaking off. there are 1 to 2 wires going to this switch. It is located on the brake pedal bracket above the foot pad.

Anonymous

  • 101 Answers
  • Posted on Oct 02, 2009

SOURCE: 1989 VW cabriolet, fuel odor, engine stalls in 1st and 2nd gear

Ignition system sounds probable on vhicle when everything gets warmed up. High pitched hum could be bad tire or worse bearing.

Testimonial: "Thank You for your response. The huming sound is present on idle from start-up,tires have just been replaced, would fuel pump be suspect?"

Anonymous

  • 538 Answers
  • Posted on Feb 19, 2010

SOURCE: 2001 Jetta won't shift into high gear/

In 2001 the "Check Engine" light might give information about what's going on with the transmission. You may want to have it checked by a shop before the transmission decides to die. It might be a simple fix.

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Headlights stay on when engine and light switch are off

You need to look at a wiring diagram to see what controls the head lamps ! Could be a relay's contacts are stuck shut causing lamps to stay on or could have a LCM - lighting control module shorted internally . The head lamp switch could be the problem . Do you know how to read a wiring diagram ? Do you know how to do basic automotive electrical testing ? You can check out such videos on you tube > Go http://www.bbbind.com/free_tsb.html for free wiring diagrams .
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I have a 1998 chrysler concorde. The airbag light on the dash stays on and my horn doesnt work. How do i fix this without costing me tons of money?

Could be a wiring problem or the clockspring in the steering column.
You would need to pull the steering wheel and test the circuits.
1helpful
1answer

2001 chevy impala overhead light wont turn off

see this steps and fix it use the VOM or DVOM. God bless you
The Cause: Most likely no voltage to the headlights because of a bad headlight relay, fuse, module, headlight switch, dimmer switch or wiring fault.
To figure out what's causing your problem, start by inspecting the main fuse for the headlight circuit. See your Owners Manual for the location of this fuse. It is often located in the power center in the engine compartment, but may also be in the fuse panel under the dash.
fuse1b.jpg If the fuse has blown, replace it with a new fuse (same amp rating) and try again. If the fuse blows immediately, there is a short in the headlight circuit that will have to be found and repaired before the headlights will work. If the fuse does not blow and the headlights work, problem solved (for now). There may be in intermittent short or overload that caused the fuse to fail.
If the fuse if okay, use a volt meter or 12-volt test light to check for power at the fuse. Most headlight circuits are on (powered) all the time, so there should be voltage to the power side of the fuse. No power at the fuse would indicate a wiring fault possibly in the fuse block or in the wiring between the fuse block and the battery. You'll need a wiring diagram to trace the wiring circuit and find the fault.
relay_1a.jpgIf the fuse is okay and there is power, the next check would be to find the headlight relay or control module. If the system uses a relay, pull it out and shake it. If anything inside rattles, replace the relay. Or buy another relay and plug that in to see if that restores power to the headlights.
On systems that use a module control module or daytime running lamps, about all you can do is eliminate other possibilities such as wiring faults, a bad relay or headlight switch first. If the module is getting power when the headlight switch is turned on, but the headlights fail to come on, the problem is likely a bad module. The module may be located in the front area of the engine compartment (common on Fords), under the dash or elsewhere in the front of the vehicle. You will probably need to refer to the vehicle service literature to find the module's location.
If the headlight relay or module do not receive voltage when the headlight switch is turned on, a bad switch is your problem. Switches get a lot of wear and tear, so it's not unusual for a switch to wear out after many years of service. Replacing a headlight switch can be difficult depending on whether is it located in the instrument panel or on the steering column.
If your headlights work on low beam, but you have no high beam, or they work on high beam but there is no low beam, the most likely cause is a bad dimmer switch. The dimmer switch is integrated into the steering column mounted headlight switch on most vehicles, so if the dimmer is not working, you will have to replace the entire switch.
DO NOT attempt to replace a steering column mounted headlight switch without first disconnecting the battery and waiting at least 20 minutes for the capacitors in the airbag circuit to discharge. The steering wheel will have to come off to replace the switch. Crossing up the wrong wires in the steering column could set off the air bag and cause personal injury.
If a headlight switch looks like it will be difficult to replace, don't try to do it yourself. Take your car to a dealer or repair shop and have them replace the switch for you.
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I have a 2003 Ford Explorer Sport Trac. My automatic headlights and auto dimming review mirror are not working. No fuses inside the cab of the truck are blown and dont know which ones under the hood...

The autolamp system, controlled by the vehicle security module, supplies voltage to the same circuits used by the headlamp switch to power the exterior lamps when low light conditions are detected.
Anyone else have or have fixed this problem some help please???? What fixed someone else's vehicle probably won't fix your's .Electronic's involved . Using service repair info. , wiring diagram's an testing the electrical circuits is how professional Technician's fix electrical system problems , not guessing or looking for magical fixes on web sites or forum's.
Visual Inspection Chart Mechanical Electrical
  • Headlamp switch
  • Battery junction box (BJB) fuses:
    • 1 (60A)
    • 16 (15A)
    • 22 (20A)
  • Central junction box (CJB) fuse 20 (5A)
  • Circuitry
  • Photocell sensor
  • Vehicle security module

Plus hooking up a factory scan tool an checking for DTC'S - diagnostic trouble code's .
Vehicle Security Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1695 Autolamp On Circuit Failure Vehicle Security Module Go To Pinpoint Test J . B1792 Autolamp Sensor Input Circuit Short to Battery or Open Vehicle Security Module Go To Pinpoint Test J . B1793 Autolamp Sensor Input Circuit Short to Ground Vehicle Security Module Go To Pinpoint Test J . B2661 Parklamp Relay Output Short to Vbatt Vehicle Security Module Go To Pinpoint Test R . B2662 Parklamp Relay Output Open Circuit Vehicle Security Module Go To Pinpoint Test I . B2663 Headlamp Relay Output Short to Vbatt Vehicle Security Module Go To Pinpoint Test F . B2664 Headlamp Relay Output Open Circuit or Short to Vbatt Vehicle Security Module Go To Pinpoint Test H . Symptom Chart Condition Possible Sources Action
  • No communication with the vehicle security module
  • Circuitry.
  • Vehicle security module.
  • REFER to Section 418-00 .
  • The autolamps are inoperative
  • Circuitry.
  • Headlamp switch.
  • Photocell sensor.
  • Vehicle security module.
  • Go To Pinpoint Test G .

Electric Testing Techniques You Need to Know
4helpful
2answers

What does the code p0442,p0456,p0700,p0645,p0481,p0340

CODE PO442 - EVAP SMALL LEAKED DETECTED. CODE PO456 - LEAK IN EVAP SYSTEM DETECTED. POSSIBLE CAUSES / VACUUM HOSE CONNECTIONS OR SWITCHES HAVE COME LOOSE OR MALFUNCTION / EVAP EMISSION SYSTEM HAS A LEAK / EVAP PURGE SOLENOID OPERATION HAS MALFUNCTION / NVLD SWITCH OPERATION HAS MALFUNCTION / CODE PO 700 - AUTOMATIC TRANSMISSION FAULT DETECTED .POSSIBLE CAUSE TRANSMISSION CONTROL MODULE RELATED SENSOR HAS SOLENOID IS DAMAGED OR HAS FAILED.TRANSMISSION CONTROL MODULE FAILED OR POWER CONTROL MODULE HAS FAILED.YOU TAKE VECHICLE TO DEALERSHIP THEY WILL TO SCAN TRANSMISSION. CODE PO645 - AC CLUTCH RELAY CIRCUIT MALFUNCTION . POSSIBLE CAUSE.INTERNALLY FUSED IGNITION SWITCH OUTPUT CIRCUIT IS FAULTY. AC RELAY CLUTCH CONTROL CIRCUIT IS OPEN OR IT IS SHORTED TO GROUND. AC RELAY CLUTCH POWER SUPPLY FUSED IGNITION CIRCUIT IS OPEN. AC RELAY IS DAMAGED OR IT HAS FAILED.PCM HAS FAILED. CODE PO481 - HIGH SPEED NUMBER 2 FAN RELAY CONTROL CIRCUIT. POSSIBLE CAUSE HI FAN RELAY POWER CIRCUIT IS OPEN FROM THE RELAY TO FUSED POWER.HI FAN CONTROL CIRCUIT IS OPEN OR SHORTED TO CHASIS GROUND. FAN RELAYS FAILED. PCM HAS FAILED. CODE PO340 - NO CAMSHAFT POSITION SENSOR CIRCUIT FAILURE. POSSIBLE CAUSE CMP SENSOR CONNECTOR IS DAMAGED OPEN OR IT IS SHORTED. CMP SENSOR SIGNAL CIRCUIT IS OPEN OR SHORTED TO GROUND OR TO BATTERY VOLTAGE OR 5 VOLT SUPPLY CIRCUIT. CMP SENSOR 5 VOLT SUPPLY CIRCUIT IS OPEN OR SHORTED TO GROND OR TO BATTERY VOLTAGE. CMP SENSOR GROUND CIRCUIT IS OPEN. CKP SENSOR IS DAMAGED OR HAS FAILED.PCM HAS FAILED. SOUND LIKE PROBLEM IS PCM GROUND WIRE BROKEN OR LOOSE OR PCM HAS FAILED.
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1answer

Hi. I have a '88 Hiace. Recently, very occasionally the headlights failed to work. If i switched the switch on and off a couple of times, they would come on. The other night, i smelt a bad electrical...

yes it will burn out again the wiring from the switch to the headlight module has a short use a voltmeter to trace it and replace wiring then put in the relay
1helpful
1answer

How do I change out the head light switch on 1992 geo storm

The headlight switch on this car may be changeable, but are you having a problem with the headlights working at all?

If so, then the following may be helpful:
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REMOVAL & INSTALLATION Spectrum The headlight control switch is a 3 position, push type switch which is located at the left side of the instrument panel.
  1. Disconnect the negative battery cable. Remove the instrument cluster bezel retaining screw and the bezel.
  2. Disconnect the electrical connectors.
  3. Place the bezel on a bench and remove the 2 nuts securing the headlight control switch.
  4. Remove the headlight control switch.
  5. To install, reverse the removal procedures.
Storm The headlight control switch is located at the left hand side of the instrument panel on the meter hood.
  1. Disconnect the battery negative cable.
  2. Remove the meter hood.
  3. Remove the instrument cluster from the meter hood.
  4. Remove the 2 clips attaching headlight control harness.
  5. Remove the 4 screws attaching the headlight switch to the meter hood.
  6. Disconnect electrical connectors from the switch and remove the switch.
  7. Reverse procedure to install. Connect battery negative cable.
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SWITCHES & RELAYS Switches are used in electrical circuits to control the passage of current. The most common use is to open and close circuits between the battery and the various electric devices in the system. Switches are rated according to the amount of amperage they can handle. If a sufficient amperage rated switch is not used in a circuit, the switch could overload and cause damage. Fig. 1: The underhood fuse and relay panel usually contains fuses, relays, flashers and fusible links tcca6p02.jpg
Some electrical components which require a large amount of current to operate use a special switch called a relay. Since these circuits carry a large amount of current, the thickness of the wire in the circuit is also greater. If this large wire were connected from the load to the control switch, the switch would have to carry the high amperage load and the fairing or dash would be twice as large to accommodate the increased size of the wiring harness. To prevent these problems, a relay is used. Relays are composed of a coil and a set of contacts. When the coil has a current passed though it, a magnetic field is formed and this field causes the contacts to move together, completing the circuit. Most relays are normally open, preventing current from passing through the circuit, but they can take any electrical form depending on the job they are intended to do. Relays can be considered "remote control switches." They allow a smaller current to operate devices that require higher amperages. When a small current operates the coil, a larger current is allowed to pass by the contacts. Some common circuits which may use relays are the horn, headlights, starter, electric fuel pump and other high draw ciruits. Fig. 2: Relays are composed of a coil and a switch. These two components are linked together so that when one operates, the other operates at the same time. The large wires in the circuit are connected from the battery to one side of the relay switch (B+) and from the opposite side of the relay switch to the load (component). Smaller wires are connected from the relay coil to the control switch for the circuit and from the opposite side of the relay coil to ground tcca6g02.gif
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Power windows wont work what fuses can i check i have replaces the driverside switch.

Fuses, Switches, Circuit Breakers And Relays
Check under hood and under the dash driver's side.
There may be a sticker on the inside of the panel cover that tells you the legend. Otherwise, it requires testing each and every one of those fuses, preferably with a fuse tester that can do it more expediently than pulling each one out and looking for a broken conductor.


Most vehicles use one or more fuse panels. This one is located on the driver’s side kick panel tcca6p01.jpg

It is possible for large surges of current to pass through the electrical system of your vehicle. If this surge of current were to reach the load in the circuit, this surge could burn it out or cause severe damage to the vehicle’s electrical system. It can overload the wiring, causing the harness to get hot and melt the insulation. To protect vehicle wiring, fuses, circuit breakers and/or fusible links are typically installed into the power supply wires throughout the electrical system. These items are nothing more than a built-in weak spot in the system. When an excessive amount of current flows through a circuit it causes an increase in heat throughout the wiring. Fuses and circuit breakers are designed as the weak link in the system and will disconnect the circuit to prevent damage to the components contained within that circuit. Components are equipped with connectors so they may be replaced in situations where they were damaged due to a power surge.
The following are descriptions as to how fuses and circuit breakers protect the electrical system:
  • Fuse- A fuse is a weak link in the system designed to create an open circuit when the amperage flowing through that circuit exceeds the limits of the fuse. As the amperage increases, the conductor within the fuse heats up and eventually melts and breaks apart. This open circuit interrupts the flow of current and protects the components in the circuit.
  • Circuit Breaker- A circuit breaker is a "self-repairing" fuse. It will open the circuit in the same fashion as a fuse. The surge creates heat the same way that a fuse is affected. When the surge subsides and the circuit cools down, the circuit breaker will reset and allow current to flow through the circuit. Typically circuit breakers do not need to be replaced.
  • Fusible Link- A fusible link (fuse link or main link) is a short length of special, high temperature insulated wire that acts as a fuse. When an excessive electrical current passes through a fusible link, the thin gauge wire inside the link melts, creating an open to protect the circuit. To repair the circuit, the link must be replaced. Some newer type fusible links are housed in plug-in modules, which are simply replaced like a fuse, while older type fusible links must be cut and spliced if they melt
CAUTION
Always replace fuses, circuit breakers and fusible links with identically rated components. Under no circumstances should a protection device of higher or lower amperage rating be substituted.
Switches Switches are used in electrical circuits to control current flow. The most common use of relays and switches is to open and close circuits between the battery and various electrical loads in a circuit. loads are rated according to the amount of amperage they can handle. All of the current that the controlled load uses flows through a switch. Using a switch with an amperage rating lower than what the circuit is rated for could overload and cause damage to the components located on that circuit. Relays
The underhood fuse and relay panel contains fuses, relays, flashers and fusible links tcca6p02.jpg

Relays are used to control high-current loads with lower currents. Since these some loads require a large amount of current, the thickness of the wire in the circuit is also greater. If a switch were used to control the circuit, all of the current required to power the high-current load would have to pass through the switch. From a design standpoint, relays are used to limit current through switches and reduce the amount of heavy gauge wiring in the vehicle.
Relays are constructed of a set of switch contacts and a small electro-magnetic coil. When current flow through the coil a magnetic field is created. This field causes the contacts to touch, in turn completing the high-current circuit. Typically, relays are constructed so that the secondary contacts are open when the relay is de-energized (turned off). Circuits where relays are used include, but are not limited to, the horns, headlights, starter motor, electric fuel pump, blower motor and cooling fan motor.
Relays are composed of a coil and a set of switch contacts. The large wires connect a high current power source to one side of the relay switch contacts and from the other side of the relay switch contacts to the load. The smaller wires connect a low current power source to the relay control coil and from the control coil to the control switch and then to ground. tcca6g02.gif

Load Every electrical circuit must include a "load'' (something to consume voltage from the power source). Loads are resistances included in circuits to limit current flow. Loads are the components installed in circuits, such as headlights, wiper motors, door lock solenoids. Without a load, the battery would flow all of its energy through a circuit directly to ground. This is called a "dead-short to ground". The unchecked flow of electricity would cause a great amount of damage to the circuit by developing a tremendous amount of heat. Short circuits can develop sufficient heat to melt the insulation of surrounding wires, even reducing a multiple wire cable to a lump of plastic and copper.
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