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 driver 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 I/P panel outlet mode All I/P panel 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. 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? | | 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 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 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 - 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 . |
Air Conditioning (A/C) System Performance Test
| 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% | 151-192 kPa (22-28 psi) | 716-1198 kPa (104-174 psi) | 7°C (43°F) |
| 19-24°C (66-75°F) | Below 40% | 151-248 kPa (22-36 psi) | 888-1391 kPa (129-202 psi) | 8°C (46°F) |
| Above 40% | 158-234 kPa (23-34 psi) | 992-1481 kPa (144-215 psi) | 8°C (46°F) |
| 25-29°C (76-85°F) | Below 35% | 199-275 kPa (29-40 psi) | 1247-1646 kPa (181-239 psi) | 12°C (52°F) |
| 35-50% | 199-268 kPa (29-39 psi) | 1302-1667 kPa (189-242 psi) | 12°C (52°F) |
| Above 50% | 192-254 kPa (28-37 psi) | 1329-1708 kPa (193-248 psi) | 12°C (52°F) |
| 30-35°C (86-95°F) | Below 30% | 206-316 kPa (30-46 psi) | 1543-1970 kPa (224-286 psi) | 15°C (59°F) |
| 30-50% | 220-303 kPa (32-44 psi) | 1557-1977 kPa (226-287 psi) | 15°C (59°F) |
| Above 50% | 220-289 kPa (32-42 psi) | 1591-1991 kPa (231-289 psi) | 16°C (60°F) |
| 36-41°C (96-105°F) | Below 20% | 275-372 kPa (40-54 psi) | 1887-2321 kPa (274-337 psi) | 20°C (68°F) |
| 20-40% | 282-351 kPa (41-51 psi) | 1887-2301 kPa (274-334 psi) | 20°C (68°F) |
| Above 40% | 254-330 kPa (37-48 psi) | 1901-2280 kPa (276-331 psi) | 21°C (69°F) |
| 42-46°C (106-115°F) | Below 20% | 310-406 kPa (45-59 psi) | 2239-2597 kPa (325-377 psi) | 23°C (73°F) |
| Above 20% | 330-431 kPa (48-60 psi) | 2239-2569 kPa (325-373 psi) | 24°C (75°F) |
| 47-49°C (116-120°F) | Below 30% | 372-468 kPa (54-68 psi) | 2521-2859 kPa (366-415 psi) | 27°C (80°F) |
Scheme 1
