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Five Fast Fixes 4/1/2015

Posted on 04/01/2015

Vehicle:    2005 Lexus GX470 Base 4.7L, V8, MFI, DOHC, Eng Desg 2UZFE
Mileage:    116,853
Customer Concern:    The left rear suspension is lower than the rest of the vehicle and there is a code 51. Replaced the left rear air suspension bag but it will not fill up.
Tests:

1. Code 51 indicates that the air suspension pump ran for more than 100 seconds but the vehicle height did not change. Determine if the pump is working properly and that it is able to build pressure. 

2. Test the rear height control valve and determine if it has battery voltage applied to the Purple/White wire and good ground on the White/Black wire. If so, the control unit is trying to open the valve and direct air to the left rear air suspension bag. If the height control valve has power and ground for the left rear circuit and there is no air coming out to the left rear air suspension bag, the rear height control valve may be faulty.
Potential Causes:
Rear Height Control Valve
Confirmed Fix:
Replaced Rear Height Control Valve

Vehicle:    2008 Jeep Wrangler Unlimited X 3.8L, V6, VIN 1, Naturally Aspirated
Mileage:    83,054
Customer Concern:    "ESP off" is displayed in the odometer at key on but the normal "ESP off" indicator does not work when pressing the Electronic Stability Program (ESP) off switch.
Tests:    

1. The ESP system has likely been permanently disabled. 

2. To enable it again, perform this procedure:
A. Turn the key on for 5 seconds and then start the engine.

B. Shift the transfer case to 4Hi.

C. With the steering wheel centered (straight ahead position), turn the steering wheel 180 degrees to the right. Press and hold the ESP button for 7 seconds. Then release the ESP button.

D. Turn the steering wheel counterclockwise to the centered position and then turn to left 180 degrees. Press and hold the ESP button for 7 seconds. Then release the ESP button.

E. Turn the steering wheel back to centered position. Press and hold the ESP button for 7 seconds. Then release the ESP button.

F. Turn the key off.
Potential Causes:    Disabled Esp System
Confirmed Fix:    Performed ESP System Disable/Enable Procedure
Tech Tips:    Performing this procedure will enable or disable the ESP system. The procedure may also be in the owner's manual.


Vehicle:    2009 Audi A5 Quattro Base 3.2L, V6, MFI, DOHC, Eng Desg CALA
Mileage:    70,000
Customer Concern:    The low oil level indicator is on after changing the oil and installing the correct amount. Is there a reset?
Tests:    

1. The low oil level indicator should reset when it sees the hood open and close which would occur during an oil change. 

2. Using a scanner, access address 46 and look at the operation of the hood switch in measure value block 026. If it always reads closed, verify the connector is plugged in. If it is, refer to Technical Service Bulletin 2023967/6.
Potential Causes:
Failed Hood Lock Assembly
Confirmed Fix:    Replaced Hood Lock Assembly


Vehicle:    2011 Chevrolet Silverado 2500 HD LTZ 6.6L, V8, MFI, VIN 8, Eng Desg LML
Mileage:    140,574
Customer Concern:    The engine will not start when hot. The previous owner filled the fuel tank with gasoline and damaged the fuel injection pump. The pump has been replaced.
Tests:    

1. Remove the return line fitting on the driver's valve cover.

2. Crank or start the engine.

3. Capture the return fuel.

4. Inspect for metal contamination. If metal is found, the system should be thoroughly inspected for contamination.

5. No metal, pinch the rubber line on the return nipple, the side with a single nipple, on the constant pressure regulator and attempt to start the engine.

6. If it now starts normally, the constant pressure regulator is defective.
Potential Causes:
Constant Pressure Regulator
Contaminated Fuel System
Confirmed Fix:    Replaced Constant Pressure Regulator 

Vehicle:    2012 Nissan Armada Platinum 5.6L, V8, MFI, DOHC, Eng Desg VK56DE, FLEX
Mileage:    39,441
Customer Concern:    Hears a beeping toward the rear of the vehicle when starting the engine. The beeping is from around the third row power folding seats.
Tests:    1. Use the third row power seat switch to fully fold the passenger side third row power seat down and then raise it all the way back up and see if the problem is corrected.

2. If the beeping is still present, perform the same procedure with the driver's side third row power seat - folding it all the way down and then fully raising it back up. 

3. Check for trouble codes in the third row power folding seat control unit. To initiate a chime code sequence cycle, turn the ignition switch ON and OFF 3 times within 5 seconds. The first digit will chime, then a pause, followed by the second digit. For example, a code 13 will have 1 chime, followed by a pause, and then 3 chimes. The third row power folding seat control unit will clear all codes that have been corrected after 255 ignition cycles.
Potential Causes: Third Row Power Folding Seat
Confirmed Fix:    Reset Third Row Power Folding Seat: Operated the seat all the way down and then all the way back up and the beeping noise stopped. The beeping may indicate to the driver that a seat is not in the proper position.
Tech Tips:    The third row power folding seat control unit is located in the control unit/cross beam assembly underneath the LH third row seat. It receives signals from the third row power folding seat switches, Transmission Control Module (TCM) and the Hall Effect switches mounted in the LH and RH seat motors. The control unit has self-diagnosis capability through chime codes and may be accessed by turning the ignition switch ON and OFF three times. The control unit drives the LH and RH seat motors to fold them up and down. The transmission has to be in park for the third row power folding seats to operate.

Five Fast Fixes- 11/27/14

Posted on 11/27/2014

Vehicle:2010 Hyundai Santa Fe GLS 2.4L, L4, MFI, DOHC, VIN B, Eng Version Theta II
Mileage:18,244

Customer Concern:The check engine light is on with an Intake Manifold Runner Performance (Bank1) code P200A.

Tests: 1. Check the resistance of the Variable Charge Motion Actuator (VCMA) motor from terminal 4 to terminal 5. The specification is 3.4 to 4.4Ω at 68 degrees fahrenheit.

2. With the key on, actuate the VCMA motor with a compatible scan tool and confirm the change of VCMA feedback sensor signal and the sound of operation. The specification is about 0.84 volts open and about 4.16 volts closed.

3. If your scan tool will not operate the VCMA motor, backprobe and monitor the VCMA position sensor signal at terminal 2 Black/Orange wire with the key on and apply battery voltage to the motor at terminal 5 Orange wire. Pulse a ground at terminal 4 Pink wire and the position sensor signal voltage should change. Then reverse and apply battery voltage at terminal 4 and pulse a ground at terminal 5 to move it the other way. The specification is about 0.84 volts open and about 4.16 volts closed. The VCMA motor is duty-cycled by the Engine Control Module (ECM) at 50% duty.

4. If the motor is not moving, remove it and verify that the shaft will rotate by hand or if it is stuck in the intake. If it will rotate by hand verify that the motor will operate when not attached to the shaft and if it won't, it has likely failed.

  • Potential Causes: Upper Intake Manifold
  • Variable Charge Motion Actuator (VCMA)

Confirmed Fix:Replaced Variable Charge Motion Actuator (VCMA): Replaced the VCMA and cleaned the intake.

Tech Tips: The Variable Charge Motion Actuator (VCMA) adjusts the runner valve to one of two positions, open or closed. The VCMA system tumbles air flow entering into combustion chamber of each cylinder by closing the VCMA valve in cold start conditions. This valve doesn't have mechanical return spring. If the PCM detects that the opened or closed stop position is out of the specified value, it sets P200A.

Five Fast Fixes- 10/11/14

Posted on 10/11/2014

Vehicle:2005 Lincoln Town Car Executive 4.6L, V8, MFI, SOHC, VIN W, GAS
Mileage:117,000

Customer Concern:The Right Front (RF) cornering lamp is on all the time whether the ignition is on or not, unless the parking lights are turned on.

Tests: 1. Disconnect the multifunction switch and look for the light to stay on or turn off.

2. If the light goes out with disconnection of the multifunction switch, it would support a shorted multifunction switch.

3. If the light is still on with the multifunction switch disconnected, disconnect the RF cornering light bulb and check for the presence of voltage to the bulb on the Brown/White (BR/WH) wire verifying it is shorted to a hot-at-all-times circuit of the harness running between the RF bulb and the multifunction switch connection. Inspect the harness and address the short, or cut the circuit as the RF cornering light bulb and the multifunction switch and run a replacement circuit between those two connections.

  • Potential Causes: Shorted Multifunction Switch
  • Shorted Cornering Light Bulb Wiring

Confirmed Fix: Replaced Cornering Light Bulb Wiring: The circuit was cut and a new wire run between the multifunction switch and bulb connections.

Five Fast Fixes- 9/12/14

Posted on 09/12/2014

Vehicle: 2008 Volkswagen Eos lux 2.0L, L4, MFI, DOHC, Eng Desg BPY
Mileage:115,029

Customer Concern:The driver's seat does not recline.

Tests: 1. Check the wiring and connector to the power seat switch assembly and to the Driver's Entry Assistance Control Module J572. Check for any signs of damage, moisture, corrosion, etc.

2. With a factory compatible scan tool, check to see if the Driver's Backrest Adjustment Switch E96 is being recognized.

  • A. Select Address Word 63-Entry Assist Driver.
  • B. Select Function 08-Read Measuring Value Block (MVB).
  • C. Enter Display Group 005. The 1st field should change as the seat height, inclination and seat back adjustment buttons are operated.

3. Pin T6ax/6 Brown (BR) at the seat adjustment switches should be a good ground at all times.

A. This pin goes to ground at Ground Connection 44 on the lower left A-Pillar.

4. Pin T10t/1 Lilac (LI) at the seat adjustment switches should have B+ present with the Driver's Backrest Stop Switch -Aft- F382 closed.

A. This power comes from fuse S44 and goes through the F382 switch before going to the E96 switch.

5. Pin T10t/4 Red/Lilac (RO/LI) at the seat adjustment switches should have B+ present with the Driver's Backrest Stop Switch -Fore- F381 closed.

A. This power comes from fuse S44 and goes through the F381 switch before going to the E96 switch.

6. Manually energize the Driver's Backrest Adjustment Motor V45 from the seat switches and verify operation. Pins T10t/5 Red/Grey (RO/GR) and T10t/7 Grey (GR) are for the V45 motor. The polarity of the pins will make the motor move in one direction or the other.

A. This should also cause the scan data for switch operation to change when energized.

  • Potential Causes: Open Fuse(s)
  • Defective Driver's Backrest Adjustment Motor V45
  • Failed Driver's Backrest Adjustment Motor V45 Wiring
  • Defective Driver's Backrest Adjustment Switch E96
  • Failed Driver's Backrest Adjustment Switch E96 Wiring
  • Defective Driver's Entry Assistance Control Module J572

Confirmed Fix: Repaired Driver's Backrest Adjustment Switch E96 Wiring

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