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How do i detect a leak in my a.c - 2000 Chrysler Grand Voyager

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  • Chrysler Master
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There are couple of ways to find a leak in your A/C system. One way is to use a "sniffer". This is a hand held device that is waved around the system and if the unit detects refrigerant, it lets you know. Another is a very strong UV light that shows where the leak is. Yet another way to help spot a leak is a dye can be added to the system (usually red) and then a visual inspection would reveal any dye where a leak would be. The easiest and least expensive is to use soapy water or better yet, a brush on leak detector sold at a Refrigeration or Heating and Air Conditioning wholesaler in your area.

Each has their advantages and disadvantages. Find a mechanic and grill him/her on how they would go about finding the leak.

The system has 3- major components and a few gadgets. There is an evaporator, a condenser, and a compressor. The evaporator is under the dash in the passenger compartment. Like the heater core, it looks like a mini radiator and is encased in the air stream. Air goes over it and the heat is exchanged into the refrigerant. The A/C compressor sucks the heat laden refrigerant back to it, compresses the gas back to a liquid, and pushes it through the condenser that is in front of the radiator. The condenser tosses the heat out of the refrigerant and sends it back to the evaporator for another trip. Thanks to the system being in a closed loop, not much leakage is to be expected. Even at the pressures the system sees (200 psi).

The problem areas are the flexible hoses that link the various components. The engine holds onto the compressor and it is powered by the crankshaft. The evaporator and condenser are mounted to the body of the car. Like motor mounts, the flexible hoses undergo stress and strain. Eventually, they will weaken and leak. Remember the pressures we're sending through these? We suggest "looking" at these connections real hard.

DON'T YANK OR PULL ON THEM!! The refrigerant is under static pressure and when it hits the atmosphere it will expand and its temperature will be cold enough to give you INSTANT FROSTBITE wherever it touches or gets near.

THAT WILL PROBABLY BE YOUR HANDS FIRST, THEN YOUR FACE. INCLUDING YOUR EYES!

OK, where were we? The flexible hoses will be found at the compressor and where they go in and out of the evaporator through the firewall on the passenger side of the car (the right side).

Make some real soapy water or get the brush on leak detector. Brush it on the hoses and connections that you can get to and see. There is a filter/drier on the right side of the engine compartment at the battery and radiator area. It should have a little glass portal on the top. (When your done with this exercise, read in your manual how to do a visual check of the system's refrigerant level using this device.)

Soap all the connections up real good. Look for bubble that would indicate a leak. Since your leak is going to be small, and might not be easily accessible, your quick leak check might not yield any positive results.

Another problem area is the condenser. There are a couple of connections there that need attention. The condenser takes the abuse of all of the stuff that gets scooped up off the road into that space. Little rocks, big rocks, sand, etc. chip away at it. The condenser in our '91 with 130+k on it is still holdin' refrigerant, but it looks beat. The bubble type leak detector may not help much here.

To recap, be VERY CAREFUL with the refrigerant. Don't let any of it out or find yourself with a wrench in one hand and eyeballin' the connection that you think you might want to tighten! The system is fairly simple and the irony is the leak may never be found. With a game plan and some knowledge of the layout, you stand a very good chance to succeed.

If somebody gets into your A/C system and changes any part of it, remind them to make sure to evacuate all the moisture, replace the filter drier, and be sure there is the right amount of refrigerant oil in the compressor. (Maybe this is why you're beloved is eating compressors?)

Also, can check this GUIDE and the next videos like references...



Good luck.

Posted on May 27, 2010

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3.3l engine. What are the probable causes of DTC P1495?


answer courtesy of engine codes .com Engine-Codes OBDII Code List P1495 Dodge
P1495 Dodge P1495 Dodge - EVAP Leak Detection Pump Solenoid Circuit Condition 3 ' Add Comment Possible causes
- Faulty Leak Detection Pump (LDP)
- Leak Detection Pump (LDP) harness is open or shorted
- Leak Detection Pump (LDP) poor electrical connection
What does this mean? When is the code detected?
Malfunction is detected when the Powertrain Control Module (PCM) detected the pump solenoid did not change status when activated,
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P1495 Dodge Description
The Evaporative emissions system is design to prevent the escape of fuel vapors from the fuel system. Leaks in the system, ca allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage.
During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.

Read more: http://engine-codes.com/p1495_dodge.html#ixzz3iQ8P3JII P1495 Dodge EVAP Leak Detection Pump Solenoid Circuit Condition

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What is a P2404 code mean from a suzuki sx4


Trouble Code: P2404 (2.0L L4 VIN 5 Automatic CVT)
Evaporative Emission System Leak Detection Pump Sense Circuit Range / Performance
Number of Trips to Set Code: 1
Trouble Code Conditions:
EVAP vent valve stuck open: EVAP leak check pressure is lower than -0.14 kPa even if EVAP vent valve is operated from OFF (OPEN) to ON (CLOSE) with EVAP leak detection pump ON. EVAP vent valve stuck closed: EVAP leak check pressure is unstable (difference between maximum and minimum is 0.36 kPa or more) when EVAP vent valve is OFF (OPEN) with EVAP leak detection pump ON. EVAP leak detection pump stuck OFF: EVAP leak check pressure is higher than -0.14 kPa even if EVAP leak detection pump is ON. EVAP leak detection pump flow high: Reference pressure of EVAP leak check pressure is lower than specified value (depending on BARO) EVAP leak detection pump flow Low: Reference pressure of EVAP leak check pressure is higher than specified value (depending on BARO).
Possible Causes:
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  • EVAP vent valve (in EVAP leak check module) and/or its circuit
  • EVAP leak check module and/or its circuit
  • ECM

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1 Answer

Where is the location of code p1495 leak detection pump solenoid circuit


The Solenoid circuit is part of Emission control.To get more info i suggest you to check the two help links given below:---Click the link below:----How to replace Leak detection pump solenoid circuit?
http://repairhelpcenter.blogspot.in/2012/05/leak-detection-pump-solenoid-circuit.html
-----------------P1495 Leak Detection Pump Solenoid Circuit?
http://howtobyme.blogspot.in/2012/05/p1495-leak-detection-pump-solenoid.html

-----------------
This will help.
Thanks.

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Engine light stays on code p1494


P1494 code is a leak detection pump switch or mechanical fault, leak detection pump switch does not respond to input. The leak detection pump (if equipped) is located under the air filter housing on models through 2001. Check if the vapor and vacuum lines are securely connected to the leak detection pump or a diagonstic trouble code my be set like this. The leak detection pump switch may be bad and need replaced.

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Diagnostic codes PO442, PO305 and PO455 comes up on the computer. What do these codes mean?


P0305....Cylinder 5 Misfire Detected


P0442....Evaporative Emission Control System Leak Detected (small leak)


P0455....Evaporative Emission Control System Leak Detected (gross leak)

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1 Answer

How do i replace the natural vacuum leak detection pump on a 2005 dodge dakota?


Vehicles equipped with NGC engine control modules use an NVLD pump and system. Vehicles equipped with JTEC engine control modules use a leak detection pump. Refer to Leak Detection Pump (LDP) for additional information.
The Natural Vacuum Leak Detection (NVLD) system is the next generation evaporative leak detection system that will first be used on vehicles equipped with the Next Generation Controller (NGC). This new system replaces the leak detection pump as the method of evaporative system leak detection. This is to detect a leak equivalent to a 0.020 (0.5 mm) hole. This system has the capability to detect holes of this size very dependably.


Removal & Installation
  1. Raise and support vehicle.
  2. Remove left-rear tire.
  3. Remove plastic shield (4) in front of left-rear tire. Access to both the EVAP canister (1) and NVLD pump (6) is from the area in front of the removed tire.
  4. Disconnect electrical connector at NVLD pump.
  5. Remove vapor line at NVLD pump. Pry outward on tab (3) and rotate pump (6) clockwise about 70 for removal.
  6. Remove NVLD pump O-ring (5) from EVAP canister (1).
To Install:
  1. Install new NVLD pump O-ring (5) to EVAP canister (1).
  2. Position NVLD pump (6) into EVAP canister (1).
  3. Rotate pump (6) until tab aligns with notch in EVAP canister (1).
  4. Carefully install vapor/vacuum lines to NVLD pump.
    WARNING The vapor/vacuum lines and hoses must be firmly connected. Check the vapor/vacuum lines at the NVLD pump, filter and EVAP canister purge solenoid for damage or leaks. If a leak is present, a Diagnostic Trouble Code (DTC) may be set.
  5. Connect electrical connector to pump.
  6. Install plastic shield in front of left-rear tire.
  7. Install left-rear tire.

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    Fig.


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    Fig.

Have a nice day (remember rated this help).


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What is the diagnostic codes P 0700 P1684 p0442 p0455 p0456 on a 2001 dodge Caravan with a 3 3"


P0700: EATX Controller DTC present
P1684: Battery was desconnected
P0442: EVAP leak monitor medium (.040). Leak detected.
P0455:
EVAP leak monitor large. Leak detected.
P0456: EVAP leak monitor small (.020). Leak detected.

I suggest check the lines and flow it down to the ldp (leak detection pump) that is just behind the steering gear under the van It has a wire connector and 2 large EVAP hoses. look for any split or crack then follow the lines back to the tank. Even a small crack is a leak.

Hope helped with this. Remember rated this help. Good luck.


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Definition of error code
Evap leak detection pump pressure switch condition
Explanation


ECM detected the leak detection pump switch did change after solenoid was energized


Probable Cause
1.-Leak detection pump defective
2.-Open or shorted circuit condition
3. Solenoid defective

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I have a 2003 dodge ram 1500 with a V-8 4.7 engine and my check engine light came on with a P0456 code and I have been told that it could be the gas cap, I have checked it and it seems fine but should I...


The leak in your evap system is very small at .020. It is more than likely a small split in a hose somewhere. The cap is probably ok, we rarely find a bad one. If it is a small split in a hose it will only get larger over time. Here is the factory info on the code. We have found that alot of these leaks are from a small hose on the evap canister under the vehicle, but with out looking at your vehicle it is hard to say. If the leak goes away or is no longer large enough to be detected, your light will go out after a few days. These leaks are emmissions related and will not effect the integrity of the vehicle. I would have it checked and corrected if the light stays on at your convienience.

Symptom List:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0442-EVAP LEAK MONITOR
MEDIUM (0.040) LEAK DETECTED.
When Monitored and Set Condition:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: If there is a leak larger than 0.0409 and smaller than 0.0809 in the
evaporative system.
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0809 in the evaporative system.
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0209 and smaller than 0.0409 in the
evaporative system.
POSSIBLE CAUSES
LEAK AT GAS CAP
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
VISUAL AND PHYSICAL INSPECTION
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
EVAP PURGE SOLENOID OPERATION
INTERMITTENT LDP MONITOR FAILURE
EVAPORATIVE EMISSION LEAK DETECTION
GAS CAP
LDP COMPONENT LEAK

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Which is it? Carburetor ice or water in gas?


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