Test Description
This test measures the operating efficiency of the A/C system under the following conditions
- The current ambient air temperature
- The current relative humidity
- The high side pressure of the A/C system
- The low side pressure of the A/C system
- The temperature of the air being discharged into the passenger compartment
The numbers below refer to the step numbers on the diagnostic table.
- 1 This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
- 2 This step measures the performance of the A/C system.
- 3 This step is to allow for vehicle variations as well as high ambient temperatures.
| Step | Action | Values | Yes | No |
|---|
| NOTE: The ambient air temperature must be at least 16°C (60°F) . Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test. |
| 1 | Park the vehicle inside or in the shade. Open the windows in order to ventilate the interior of the vehicle. If the A/C system was operating, allow the A/C system to equalize for about 5 minutes. Turn OFF the ignition. Install the J 43600 ACR 2000 air conditioning service center. Record the ambient air temperature displayed on the J 43600 ACR 2000 air conditioning service center. Record the low and high side STATIC pressure readings. Are both the low side and high side pressures above the specified value? | More than 16°C (60°F) - 345 kPa (50 psi) More than 24°C (75°F) - 483 kPa (70 psi) More than 33°C (90°F) - 690 kPa (100 psi) | Go to Step 2 | Go to Leak Testing |
| 2 | NOTE: Record the relative humidity and the ambient air temperature at the time of the test. Close the vehicle doors and windows. Open the driver door window 12.7-15.2 cm (5-6 in). Select the following HVAC control settings: The A/C is ON. The maximum blower speed The maximum blower speed selected on the auxiliary blower controls Recirculation mode The Face mode The coldest temperature setting Passenger setting is OFF All A/C outlets are OPEN Install the temperature probes of the J 43600 ACR 2000 air conditioning service center in the left and right center A/C air outlets. Apply the parking brake. Place the transaxle/transmission in the following position: PARK. Start the engine. Operate the A/C system for 5 minutes. Inspect A/C components for the following conditions: Abnormal frost areas Unusual noises NOTE: Make sure that the compressor is engaged when taking the data. Press the RESET button, before using the print function of the J 43600 ACR 2000 air conditioning service center. Print the following information: The outlet air temperatures The low-side pressure The high-side pressure Compare the low and high side pressures and the output temperatures to the A/C Performance Table. Does all the data recorded fall within the specified ranges of the A/C Performance Table? | | Go to Step 8 | Go to Step 3 |
| 3 | If the pressures and temperatures recorded do not fall within the specified ranges of the A/C Performance Table: Continue to operate the A/C system for an additional 5 minutes. RESET the J 43600 ACR 2000 air conditioning service center and record the pressures and temperatures again. Compare the low and high side pressures and the output temperature to the A/C Performance Table. Does all the data recorded fall within the specified ranges? | | Go to Step 8 | Go to Step 4 |
| 4 | Do the high and low side pressures fall within the specified ranges, but the outlet temperatures do not? | | Go to A/C Diagnostics Chart | Go to Step 5 |
| 5 | Is the low side pressure greater than the specified range, but the high side pressure within or less than the specified range? | | Go to A/C Diagnostics Chart | Go to Step 6 |
| 6 | Are the low and high side pressures both greater than the specified ranges? | | Go to A/C Diagnostics Chart | Go to Step 7 |
| 7 | Is the high side pressure greater than or within the specified range, but the low side pressure is less than the specified range? | | Go to A/C Diagnostics Chart | Go to Step 8 |
| 8 | Operate the system in order to verify the test results. Did you find the same results? | | System OK | Go to Symptoms - HVAC Systems - Automatic |
| NOTE |
|---|
| The ambient air temperature must be at least 16°C (60°F) . Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test. |
| NOTE |
|---|
| Record the relative humidity and the ambient air temperature at the time of the test. |
| NOTE |
|---|
| Make sure that the compressor is engaged when taking the data. Press the RESET button, before using the print function of the J 43600 ACR 2000 air conditioning service center. |
Air Conditioning (A/C) System Performance Test (LF1 or LFX)
| Ambient Temperature | Relative Humidity | Low Side Service Port Pressure | High Side Service Port Pressure | Maximum Left Center Discharge Air Temperature |
|---|
| 13-18°C (55-65°F) | 0-100% | 151-213 kPa (22-31 psi) | 427-902 kPa (62-131 psi) | 7°C (43°F) |
| 19-24°C (66-75°F) | Less than 40% | 151-241 kPa (22-35 psi) | 558-1047 kPa (81-152 psi) | 8°C (46°F) |
| Greater than 40% | 165-261 kPa (24-38 psi) | 668-1129 kPa (97-164 psi) | 9°C (48°F) |
| 25-29°C (76-85°F) | Less than 35% | 186-261 kPa (27-38 psi) | 923-1288 kPa (134-187 psi) | 10°C (50°F) |
| 35-50% | 192-275 kPa (28-40 psi) | 957-1302 kPa (139-189 psi) | 12°C (52°F) |
| Greater than 50% | 206-289 kPa (30-42 psi) | 992-1322 kPa (144-192 psi) | 13°C (54°F) |
| 30-35°C (86-95°F) | Less than 30% | 213-296 kPa (31-43 psi) | 1191-1598 kPa (173-232 psi) | 13°C (55°F) |
| 30-50% | 220-310 kPa (32-45 psi) | 1212-1577 kPa (176-229 psi) | 14°C (63°F) |
| Greater than 50% | 234-323 kPa (34-47 psi) | 1219-1557 kPa (177-226 psi) | 15°C (66°F) |
| 36-41°C (96-105°F) | Less than 20% | 248-323 kPa (36-47 psi) | 1529-1929 kPa (222-280 psi) | 17°C (61°F) |
| 20-40% | 248-337 kPa (36-49 psi) | 1522-1880 kPa (221-273 psi) | 18°C (63°F) |
| Greater than 40% | 261-344 kPa (38-50 psi) | 1508-1839 kPa (219-267 psi) | 18°C (64°F) |
| 42-46°C (106-115°F) | Less than 20% | 282-358 kPa (41-52 psi) | 1867-2197 kPa (271-319 psi) | 19°C (70°F) |
| Greater than 20% | 289-365 kPa (42-53 psi) | 1853-2129 kPa (269-309 psi) | 20°C (68°F) |
| 47-49°C (116-120°F) | Below 30% | 316-385 kPa (46-56 psi) | 2122-2418 kPa (308-251 psi) | 20°C (72°F) |
Scheme 1
Scheme 1: A/C System Pressure - Zone Classification
