Dec 232017
 

2002 Chevy Silverado

I drove my 2002 Chevy Silverado 2500HD Duramax Diesel about month a and a half go with no problems. I went to take the truck out today, it started right up and I let in warm up for about five minutes. When I went to back out of the garage there was no power steering and no power brakes. Serpentine belt is on and no signs of any leaks. The power steering fluid is full and brake fluid full. Any ideas what might be wrong. Truck has only 76,000 miles on it.


Hydro-boost Testing

Fluid level good: Check tension and condition of drive belt. If the drive belt is loose or damaged, tighten or replace as required and repeat the basic test (Steps 1-2). If pump speed is slow, adjust and repeat basic test. If pump speed is OK, perform pump flow and relief pressure test.

Perform Basic Test:

  1. Engine (pump) off, depress and release the brake pedal four times to deplete all hydraulic pressure from hydo-boost.
  2. Depress brake pedal and hold with light pressure then start the engine. If the power section is operating properly the pedal will fall slightly and then hold. Less pressure will be needed to hold the pedal in this position. If the power section is NOT operating, go to step 3, otherwise go to step 4.
  3. If power section is not operating properly, check pump reservoir level. If level is low, add fluid and repeat basic test plus Hydraulic Leak Test (Steps 4 to 5). If fluid level is good, go to step 6.
  4. Steering Hydraulic Leak Test: Thoroughly clean the hydo-boost unit and all hose connections. Start the engine and run at idle speed. If the hose fittings do not leak go to step 5.
  5. Check the hydro-boost for leaks. Apply the brake pedal with approximately 100 lbs. force and hold while checking hydro-boost hose fittings for leaks. Do not hold brake pedal at 100 lbs. effort for more than five seconds at a time. If the hydo-boost leaks, it is defective and should be replaced or repaired. If no leaks are found in the hydro-boost or hoses, do not repair or replace them.
  6. Fluid level good: Check tension and condition of drive belt. If the drive belt is loose or damaged, tighten or replace as required and repeat the basic test (Steps 1-2). If pump speed is slow, adjust and repeat basic test. If pump speed is OK, perform pump flow and relief pressure test.
  7. If pump output is below minimum specification, replace and repeat basic test. If all test and checks are OK, the booster is defective and should be replaced or repaired.
  8. If power section is operating, perform the following steps in order.
  9. Hydro-boost accumulator pressure retention test: Run pump to medium speed, apply brake pedal force to 100 lbs. for not more than five seconds and then stop engine.
  10. Wait 90 seconds and apply the brakes. Two or more applications should be power assisted. If applications are not power assisted the hydro-boost is defective and should be replaced or repaired. If applications are power assisted, go to next step.
  11. Thoroughly clean the hydo-boost unit and all hose connections. Start the engine and run at idle speed. If the hose fittings do not leak, go to step 5.
  12. Check the hydro-boost for leaks. Apply the brake pedal with approximately 100lbs force and hold while checking hydro-boost hose fittings for leaks. Do not hold brake pedal at 100 lbs. effort for more than five seconds at a time. If the hydo-boost leaks, it is defective and should be replaced or repaired. If no leaks are found in the hydro-boost or hoses, do not repair or replace them. Perform the brake hydraulic leak test.
  13. Brake Hydraulic Leak Test – Depress and release brake pedal several times, then hold pedal depressed with medium pressure of 25 to 35lbs. If pedal does not fall away, hydraulic system is not leaking. If pedal falls away, go to next step.
    Pedal falls away under constant pressure – hydraulic brake system is leaking. Check for external leaks at wheel cylinders, calipers, hoses and lines. If no leaks are found, additional diagnostic steps are necessary.
Service

The hydro-boost in not serviceable in the field. If the unit is not functioning properly, it must be replaced. The replacement process is straight forward, but bleeding can sometimes be tricky. I am offering a choice of techniques in this area. Hydro-boost brake systems are supposed to be self-bleeding, but this does not always prove to be true.
Source: www.brakeandfrontend.com/operation-diagnosis-and-repair-of-hydro-boost-power-assist-systems/

Dec 222017
 

2013 Chrysler 200

Both headlights have stopped working


Headlights stopped working

If you know both were working then I would start with checking the fuses. If one was out and now both, start with replacing the headlights. There are 3 fuses to check. Check fuse #33, #17 and #12. Once you confirm the fuses are good, test for power and ground at the headlights.

Good power and ground means replace the headlamps. Still now power, check the multi-function switch. If that checks out then you are left with the Power module or wiring. I’ll supply you with a wiring diagram to help assist you with the problem.

Headlight wiring diagram – 2013 Chrysler 200

(best viewed with Google Chrome or Firefox)
2013-chrysler-200-color-schematics-headlights-1-of-1

Dec 202017
 

2009 VW Jetta

We are considering purchasing this 2009 VW Jetta 2.5 with 76000 miles on it. First of all it had the EPC light on the instrument cluster when we got to the dealer. So they said they replaced 1 spark plug & coil pack & the light went out. Does this repair sound appropriate or should we be concerned there could be something more serious wrong with the car?
Thanks Phil


Seems like you should be concerned that there is something more serious going on! I would move on to a different vehicle for sure. Most of all the EPC light has nothing to do with the spark plugs or coil packs. Therefore I would suggest looking at something else unless you are completely in love with it. And the dealer is willing to WARRANTY the vehicle.

EPC Light – Electronic Power Control Warning Light

If a malfunction is recognized in the EPC system, the ECM switches on the the EPC warning light.

For EPC, the throttle valve is not operated by a cable from the accelerator pedal. There is no mechanical connection between the accelerator pedal and the throttle valve. The EPC is a system containing all components that contribute to recognizing, controlling and monitoring the position of the control valve.

EPC loation diagram 2009 VW Jetta

Dec 192017
 

Jeep Grand Cherokee Laredo

I replaced my brake booster. Now my lock on the driver side won’t lock all the doors like it should. My keyfob stopped working and my dome lights stay on. Is this a coincidence or did I maybe bump something?


Dome light stays on

Coincidence. The door ajar switch and door lock assembly are connected. The dome light is staying on because it thinks the door is still open(ajar). This may also be why the keythob doesn’t feel like working.

Dec 172017
 

2006 Cadillac CTS

Location of the TCM. Does a used one from another CTS need to be reprogrammed?
Does this this cause a engine reduce power message?


The engine reduce power message has to do with the TAC system. Throttle Actuator Control(TAC) is your electronically controlled throttle. In most cases the the throttle body(TAC System) will need to be replaced. In some cases a software update may cure the issue. And in rare occasions simply unplugging the battery for a few minutes works.

For whatever reason you want to swap out the TCM with a used one, you may need to reprogram it.

Transmission Control Module(TCM)

TCM(8) is located at the right front of engine compartment.

TCM location - 2006 Cadillac CTS

Transmission Control Module Programming and Setup

The transmission control module (TCM) must be programmed with the proper software/calibrations. Ensure that the following conditions exist in order to prepare for TCM programming:
– The battery is fully charged.
– The ignition switch is in the RUN position.
– The Techline equipment cable connection at the data link connector (DLC) is secure.
Program the TCM using the latest software matching the vehicle.
If the TCM fails to program, proceed as follows:
Ensure that the TCM connection is OK.
Inspect the Techline equipment for the latest software version.
Attempt to program the TCM. If the TCM still cannot be programmed properly, replace the TCM.

Dec 162017
 

2002 Ford Mondeo

Hi, my car won’t move in drive


Car won’t move in drive

First thing to check would be the transmission fluid level. If it is low, top it off and test. If it is not low, look at the color against a white paper towel. If the color looks dark or burnt then there may be internal damage. If the fluid level is full and the color is pretty pink, there may be a sticking solenoid in the transmission.

Of course there may be other things that could cause this such as a broken cv axle shaft but that isn’t very common. Another cause could be the shifter isn’t going into gear all the way. Try moving the the shifter to low and see if it will do anything. Does it move in reverse?

 

Dec 152017
 

Cadillac Coupe Deville

What can happen when you air conditioner gets charged with the wrong Freon?


Short answer: you will get this mixture of GOO, in your system, that will burn up your compressor in a very short time. Therefore R12 and r134 cannot be mixed… they are incompatible and don’t work as a mixture.

Wrong Freon

Being a 1993 the air conditioning system originally required R-12 Freon. If at anytime it was converted to R-134a Freon, the installation ports would have been changed to only accept the newer style Freon. This makes it difficult to add the wrong type of Freon.

If for some unforeseen reason the two were intermixed, the entire system will need to be flushed. The orifice tube, o-rings and accumulator will need to be replaced as well. And if the system was operated with the contaminated Freon, you may also need to replace the Compressor.

 

Dec 132017
 

Hyundai Sante Fe

What do DTC # P0301, 0304, 0500 and 0501 mean?


P0301 is a misfire code for cylinder #1 and P0304 is a misfire code for cylinder #4

Code P0301 and P0304 Probable Causes

  1. Update control unit software – Check for the latest control unit update
  2. Powertrain or Engine Control Module faulty
  3. Fuel injector(s) faulty
  4. Ignition system – Ignition module, coil, spark plugs and wires
  5. Fuel system

Hyundai Code P0500 – Vehicle Speed Sensor A

Code P0500 Probable Causes

  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software – Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty

Hyundai Code P0501 – Vehicle Speed Sensor A Range/Performance

Code P0501 Probable Causes

 

  • Sensor or solenoid faulty
  • Connector terminal contact is damaged or corroded
  • Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
  • Update control unit software – Check for the latest control unit update
  • Powertrain or Engine Control Module faulty

 

Dec 132017
 

Chrysler Pacifica

Is it possible for someone to have damaged my rear compression control arm? Because I have not hit anything for it to break in half the way it did.


Rear Suspension

Anything is possible. But it would be difficult for someone to cause a small enough amount of damage in order for it to break at a later date in time. It would be more likely that a pothole or parking block covered in snow would be the culprit. Maybe someone else was driving and mistakenly forgot to mention it.

The knuckle, camber link, compression link(8) and tension link are aluminum castings. Extra care needs to be taken when servicing these components. The wheel and tire mount at the end of the knuckle(7).

Unless you have recently had some work done, I do not think anything was done to it to cause it to break.

rear suspension diagram 2004 Chrysler Pacifica