Test Description
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 |
|---|
| IMPORTANT: 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 2 minutes. Turn OFF the ignition. Install the J 43600 ACR 2000 Air Conditioning Service Center. See Special Tools . Record the ambient air temperature displayed on the J 43600 . See Special Tools . Record the low and high side STATIC pressure readings. Are both the low side and high side pressures within 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 | IMPORTANT: Record the relative humidity and the ambient air temperature at the time of the test. Close the vehicle doors and windows. Open the drivers door window 12.7-15.2 cm (5-6 in). Select the following HVAC control settings: The A/C is ON. The coldest temperature setting The maximum blower speed Recirculation mode The instrument panel (I/P) outlet mode All I/P outlets are OPEN. Install the temperature probes of the J 43600 in the left and right center panel air outlets. See Special Tools . Apply the parking brake. Place the transaxle/transmission in one of the following positions: PARK (Automatic) NEUTRAL (Manual) Start the engine and warm to operating temperature. Operate the A/C system for 5 minutes. Inspect A/C components for the following conditions: Abnormal frost areas Unusual noises IMPORTANT: Press the RESET button, before using the print function of the J 43600 . See Special Tools . Print the following information: The panel outlet air temperatures The low-side pressure The high-side pressure Compare the low and high side pressures and the panel output temperatures to the A/C Performance Table below. Does all the data recorded fall within the specified ranges of the A/C Performance Table below? | | Go to Step 8 | Go to Step 3 |
| 3 | If the pressures and temperatures recorded do not fall within the specified ranges: Continue to operate the A/C system for an additional 5 minutes. RESET the J 43600 and record the pressures and temperatures again. See Special Tools . Compare the low and high side pressures and the panel output temperature to the table below. Does all the data recorded fall within the specified ranges of the table below? | | Go to Step 8 | Go to Step 4 |
| 4 | Do the high and low side pressures fall within the specified ranges, but the panel outlet temperatures do not? | | Go to Air Conditioning (A/C) Diagnostics - Pressure Zone A | 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 Air Conditioning (A/C) Diagnostics - Pressure Zone B | Go to Step 6 |
| 6 | Are the low and high side pressures both greater than the specified ranges? | | Go to Air Conditioning (A/C) Diagnostics - Pressure Zone C | Go to Step 7 |
| 7 | Is the high side pressure greater than the specified range, but the low side pressure is within or less than the specified range? | | Go to Air Conditioning (A/C) Diagnostics - Pressure Zone D | 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 or Symptoms - HVAC Systems - Manual |
| IMPORTANT |
|---|
| 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. |
| IMPORTANT |
|---|
| Record the relative humidity and the ambient air temperature at the time of the test. |
| IMPORTANT |
|---|
| Press the RESET button, before using the print function of the J 43600 . See Special Tools . |
Scheme 10
| 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% | 150-215 kPa (22-31 psi) | 1050-1370 kPa (148-199 psi) | 10°C (50°F) |
| 19-24°C (66-75°F) | Less than 40% | 150-182 kPa (22-26 psi) | 1120-1430 kP (163-245 psi) | 6°C (43°F) |
| Greater than 40% | 150-228 kPa (22-33 psi) | 1190-1470 kP (173-250 psi) | 10°C (50°F) |
| 25-29°C (76-85°F) | Less than 35% | 150-200 kPa (22-29 psi) | 1330-1570 kPa (193-228 psi) | 8°C (46°F) |
| 35-50% | 150-210 kPa (22-30 psi) | 1350-1570 kPa (190-228 psi) | 9°C (48°F) |
| Greater than 60% | 153-231 kPa (22-34 psi) | 1360-1560 kPa (190-226 psi) | 11°C (52°F) |
| 30-35°C (86-95°F) | Less than 30% | 150-228 kPa (22-33 psi) | 1490-1750 kPa (200-254 psi) | 10°C (50°F) |
| 30-50% | 156-230 kPa (22-33 psi) | 1490-1720 kPa (216-250 psi) | 11°C (52°F) |
| Greater than 50% | 170-233 kPa (25-34 psi) | 1490-1670 kPa (216-242 psi) | 12°C (54°F) |
| 36-41°C (96-105°F) | Less than 20% | 186-264 kPa (27-38 psi) | 1700-1960 kPa (247-284 psi) | 14°C (57°F) |
| 20-40% | 187-255 kPa (27-37 psi) | 1690-1900 kPa (245-276 psi) | 13°C (55°F) |
| Greater than 40% | 189-246 kPa (27-36 psi) | 1660-1840 kPa (241-267 psi) | 13°C (55°F) |
| 42-46°C (106-115°F) | Less than 20% | 229-296 kPa (33-43 psi) | 1910-2120 kPa (277-308 psi) | 17°C (63°F) |
| Greater than 20% | 224-277 kPa (33-40 psi) | 1880-2040 kPa (273-305 psi) | 16°C (61°F) |
| 47-49°C (116-120°F) | Below 30% | 256-312 kPa (37-45 psi) | 2040-2230 kPa (296-324 psi) | 19°C (66°F) |
