2004 Chevrolet Trailblazer ABS

Auto Repair Questions, Chevy Comments Off on 2004 Chevrolet Trailblazer ABS
Oct 112017

Chevy Trailblazer

My wife’s car has had an abs light on since right after we bought it. I had the codes read. They said it was the wheel speed sensor. I changed out both wheels speed sensors and put brand new brake pads on the front and back as well as new calipers all the way around. She said she drove it today the light still on and it was raining. She was coming to a stop sign and hit the brakes. It made an awful noise and it didn’t want to come to a stop. I have replaced the master cylinder and I have bled the brakes. I have also sanded down all the ground leads and put them back on and sprayed with undercoating as stated. Someone told me it could be the EBCM what should I do or change?


The description of what your wife told you would indicate the ABS was functioning properly. When the roads are wet or icy the ABS motor will activate, making a groaning noise, this prevents the wheels from locking up. When the ABS is activated the light may illuminate temporally and generally goes back off. If the light is on continuously the ABS will not function.

If you want to make sure the ABS doesn’t come and go you can disable the function by removing the ABS fuse or relay. Doing so will allow the brakes to function like all the old cars used to without ABS. Learning to brake a little earlier will help slow the car and also cause your brake pads and rotors to last longer. You can drive the car this way as long as you like but the ABS light will remain on.

If you want to repair the ABS system the use of a scan tool will be required for individual testing of components.

Antilock Brake System (ABS) Warning light

With the Anti-Lock Brake System (ABS), this light will come on when you start your engine and may stay on for several seconds, that is normal.

A chime may also sound when the light comes on.

If the light stays on, or comes on when you are driving, your vehicle needs service. When the regular brake system warning light is not on, you still have brakes, but you do not have anti-lock brakes. If the regular brake system warning light is also on, you do not have anti-lock brakes and there is a problem with your regular brakes. See Brake System Warning Light earlier in this section.

The ABS warning light should come on briefly when you turn the ignition key to RUN. If the light does not come on then, have it fixed so it will be ready to warn you if there is a problem.

Antilock Brake System

When wheel slip is detected during a brake application, the ABS enters antilock mode. During antilock braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from slipping. A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can decrease, hold, or increase hydraulic pressure to each wheel brake. The ABS cannot, however, increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.

During antilock braking, a series of rapid pulsations is felt in the brake pedal. These pulsations are caused by the rapid changes in position of the individual solenoid valves as the EBCM responds to wheel speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during antilock braking and stop when normal braking is resumed or when the vehicle comes to a stop. A ticking or popping noise may also be heard as the solenoid valves cycle rapidly. During antilock braking on dry pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and pedal pulsations are considered normal during antilock operation.

Vehicles equipped with ABS may be stopped by applying normal force to the brake pedal. Brake pedal operation during normal braking is no different than that of previous non-ABS systems. Maintaining a constant force on the brake pedal provides the shortest stopping distance while maintaining vehicle stability.

Programming the Traction Control Automatic Engagement Feature

The automatic engagement feature may be programmed so that the traction control system activates or does not activate automatically at the start of each ignition cycle. In order to change the status of the automatic engagement feature, perform the following procedure:

Important Failure to follow the correct procedure may cause DTC C0283 to set in EBCM memory.

  • Park the vehicle and apply the parking brake.
  • Unlock the ignition and shift the transmission into NEUTRAL (N).
  • Turn the ignition ON, engine OFF.
  • Press and hold the brake pedal and the accelerator pedal.
  • Press and hold the traction assist switch for 5 seconds.
  • Release the brake and accelerator pedals and the traction control switch.
  • Turn the ignition OFF.
Oct 112017

2004 Buick Rainer

I can’t get the A/C or Heat to come out the front vents. The vents are open, it will work on windshield, floor, and back vents. I have checked the fuses and none are blown. What do u advise? If not to complicated I would like to do it myself. Also what part would I need and what would that be called?
Thank You,
Velda


This sounds to me like a failed mode door actuator. Its failure is so common that Dorman has come up with a better direct replacement version.
Part you will need: Dorman 604-110 Air Door Mode Actuator

Shop Automotive

Mode Actuator Replacement

Removal Procedure

  • Remove the left side sound insulator screws.
  • Remove the left hand floor duct.

Mode Actuator 2004 Buick Rainer

  • Disconnect the electrical connector from the mode door actuator.
  • Remove the screws from the mode actuator (1).
  • Remove the mode door actuator.

Installation Procedure

Important The new actuator is in Bi-Level mode. Place the door in the middle of the travel position before you install the actuator.

  • Install the mode actuator (1).
  • Install the screws to the mode door actuator (1).

Tighten
Tighten the screws to 1.9 N·m (18 lb in).

  • Install the left hand floor duct.
  • Install the left side sound insulator screws.
  • Recalibrate the mode actuator.
Oct 092017

2006 Pontiac Montana

How do you reset the in dash temperature? Or the temperature sensor for ambient temperature, outside temperature? It is a 2006 Pontiac Montana SV6 with the 3.5 engine.


Ambient Temperature Sensor Replacement

There is no reset procedure. If the reading is off you may need to replace the sensor or check the wiring harness connections. The ambient outside temperature sensor is locate on the radiator support.

The radiator support flange mounts the ambient outside air temperature sensor near the radiator baffle. A 2-wire weather pack electrical connector attaches the ambient outside air temperature sensor to the forward lamp harness. In order to service the ambient outside air temperature sensor, perform the following steps:

  1. Disconnect the electrical connector (3) from the outside ambient air temperature sensor through the fascia opening.
  2. Remove the push in retainer (2).
  3. Remove the outside ambient air temperature sensor (1) from the vehicle.

ambient temperature sensor location diagram 2006 Pontiac Montana

Brake lines 2000 Chevy Impala

Auto Repair Questions, Chevy Comments Off on Brake lines 2000 Chevy Impala
Oct 092017

2000 Chevy Impala

My 2000 Chevy Impala LS 3.8 motor brake lines are shot. Wondering how much it’s going to cost me to replace them. I believe it’s only the front ones.


Brake line Cost

If you are referring to the brake hoses that attach to the calipers it shouldn’t take more than a hours worth of labor. Around $100 plus parts and tax of course. The labor guide does not reference replacing the brake lines and will normally be charged by the hour for how ever long it takes. I wouldn’t think any longer than a couple of hours plus parts.

Oct 092017

2002 Ford Mustang

I need to see which color wires and what holes they plug in on engine wiring harness that control fuel injectors, coils, etc. It has 25 to 30 pins.


I shall provide you with the engine wiring diagram in 3 parts. (best viewed with Chrome or Firefox)

Engine Wiring Diagram 2002 Ford Mustang GT

2002-ford-mustang-gt-engine-controls-1-of-3
2002-ford-mustang-gt-engine-controls-2-of-3
2002-ford-mustang-gt-engine-controls-3-of-3
Oct 052017

1994 Chevy Corsica

I have a Chevy and it starts up but when you put in gear it stalls would it be the starter or something else?


Something else. The starter is used to “start” the engine and is disengaged once it starts.  The most common cause for this would be the TCC Torque Converter Clutch solenoid. In most cases if you can unplug the TCC solenoid (5 in diagram) at the transmission and the stalling issue will go away. However the converter will no longer lock up. This will leave you with the impression that you no longer have overdrive. Rest assured, you can drive the car this way for as long as you would like or until you decide to drop some serious coin and have it fixed.

TCC Solenoid location diagram 1994 Chevy Corsica

The TCC Solenoid

The TCC solenoid is what actually causes the TCC to engage and disengage.

When the TCC solenoid receives a signal from the ECM, it opens a passage in the valve body and hydraulic fluid applies the TCC. When the ECM signal stops, the solenoid closes the valve and pressure is vented causing the TCC to disengage. If the TCC fails to disengage when the vehicle comes to a stop, the engine will stall.

Source: ThoughtCo.com

Oct 052017

2000 Chevy Malibu

AC blower controls

I’m having issues with AC blower controls flap will go from face to feet after a few minutes then comes back randomly.
Recently found out I had a leak on AC compressor and had it replaced at a shop. We have had issues with my AC button on my AC Heater control switch. When I would push the AC switch and start driving down the road then it would would randomly turn off by itself. Looked up online and and seems to be a common issue with several GMs around that year. I saw a video on how to fix on your own (didn’t think I would be that crafty) so I just bought a new AC Delco AC Heater control switch. I installed the control switch and for the first time in a long time I had continuous cold AC.

Seems the face vents go out

But now it seems another issue has popped up. When I get into car and turn on air I always have just regular air going thru the top face vents. I hardly ever use the feet fan even in winter. The AC will be running fine then it seems the face vents go out and only can feel a lower feet vent. This isn’t permanent as while driving it will switch back to face or after parking. Is this an electrical, vacuum or bad new switch? Is the flap controlled by a vacuum or some type of electrical motor?
Also we had an unusually cool night and I tried something new I had run the face vent with just warm air and it stayed to face vents the whole trip. So not sure if that will help in anyway but thought I would include it.
My car has 159268 miles. My car has an automatic transmission. It has the 3.1 L V6 engine.


This vehicle is equipped with vacuum actuators that control the opening and closing of the vent doors and temperature blend door. So there is a chance that you may have a small vacuum leak or failing actuator. The fact that once you are driving for a while gives it a chance to build up some vacuum pressure. This allows the actuators to work for a while until they loose vacuum again.

vacuum acuator diagram 2000 Chevy Malibu

  1. Actuator Vacuum Hose
  2. Vacuum Actuator
  3. Vacuum Hose Harness
  4. Harness Connection

HVAC Air Delivery/Temperature Control Circuit Description

The vacuum actuators move the air valves in the HVAC system (except the temperature valve). Vacuum is applied to the actuators through the mode selector in the heater A/C control assembly. The mode selector consists of a rotary vacuum switch. The rotary vacuum switch supplies vacuum to the vacuum actuators according to the operating mode selected by the driver. A small servo motor moves the air temperature actuator. The small servo motor positions the door according to the voltage level from the temperature selector in the heater A/C control assembly. The temperature selector is a potentiometer positioned by the temperature control knob on the front of the heater A/C control assembly.

Air Temperature Actuator

When the ignition switch is in the RUN position, battery voltage is applied to the air temperature actuator. The actuator receives ground at all times through the following components:
•CKT 251
•Ground G204

The temperature selector is a potentiometer with a wiper arm. The wiper arm is electrically tied to the air temperature input through CKT 733.

When the temperature selector is moved between COLD and HOT, voltage to the control input varies between 1 and 12 volts. The temperature valve motor solid state circuitry performs the following tasks:
•Looks at the control input voltage
•Moves the motor to correspond to the control input voltage

The temperature valve moves for the following reasons:
•In order to allow the air to pass through the heater core
•In order to allow the air to pass around the heater core

This control achieves the desired passenger compartment temperature.

Oct 052017

2007 Dodge Charger R/T

Was driving home and car started to get hot. I stopped the car and the temp gauge went all the way to C. So I started it up and engine  sounded great, temp gauge stayed on C. I had two stop signs and then I slowed down to turn in my drive and it died. At that point the tank was hot so I pushed it in driveway. This morning went to start it and it had a loud noise clanking in the front and won’t stay running. I’m thinking timing chain because it was OK when it died. Unsure.


Sounds about right. I would remove the serpentine belt and start it up again to make sure it is an internal noise before digging into the timing chain.

Oct 042017

2004 Chrysler Concorde

2004 Chrysler Concorde 2.7 recently developed code p0700 a general tranny code and p1779 solenoid switch in the l/r position. Did some looking and found a bare wire on either the speed input sensor or output sensor. Not sure what on. I fixed the problem and now the cruise control works as well. Could that have caused the tranny codes?


Yes.

Chrysler Code P0700

Transmission Control System (Malfunction Indicator Lamp Request)

 Code P0700 Probable Causes

  1. Sensor or solenoid faulty
  2. Update control unit software – Check for the latest control unit update
  3. Powertrain or Engine Control Module faulty
  4. Transmission system malfunction

Generic Code P1779

Engine Torque Delivered to TCM Signal

Code P1779 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
Oct 032017

2011 Hyundai Tuscon

CBD II codes: P0302, P0170, and P2006 Can the engine problems be resolved by using a fuel additive/cleaner and replacing the fuel filter?


I would have to say NO. You may review the code information and see it is going to take a bit more than a filter and fuel change.

Hyundai Code P2006

Intake Manifold Runner Control Stuck Closed Bank 1

Code P2006 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 P0170

Fuel Trim (Bank 1)

Code P0170 Probable Causes

  1. Sensor or solenoid faulty
  2. Update control unit software – Check for the latest control unit update
  3. Powertrain or Engine Control Module faulty
  4. Fuel pressure – Pump, regulator, filter or lines

Hyundai Code P0302

Cylinder 2 Engine Misfire Detected

Code P0320 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