Step | Action | Value(s) | Yes | No | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Are any HVAC DTCs or PCM DTCs stored? | -- | For HVAC DTCs, Go to DTC Table For PCM DTCs, Go to Diagnostic Trouble Code (DTC) List | Go to Step 2 | ||||||||||||||||||
2 |
Is the left cooling fan operating at low speed and is the right cooling fan operating at high speed? | -- | Go to Step 3 | Go to Functional Check | ||||||||||||||||||
3 |
Does the condenser outlet feel warm? | 21°C (70°F) | Go to Step 5 | Go to Step 4 | ||||||||||||||||||
4 | A restriction exists in the high side of the system.
Did you complete the repair? | -- | System OK | -- | ||||||||||||||||||
5 |
Does the evaporator inlet pipe feel noticeably colder than the accumulator surface? | -- | Go to Step 6 | Go to Step 8 | ||||||||||||||||||
6 | A low refrigerant charge is indicated. Perform a leak test of the A/C system. Refer to Leak Testing . Did you find and correct a leak? | -- | Go to Step 7 | Go to Step 8 | ||||||||||||||||||
7 |
Is the repair complete? | -- | System OK | -- | ||||||||||||||||||
8 |
Do the following actions occur?
| Minimum: 69 kPa (10 psi) Maximum: 138 kPa (20 psi) | Go to Step 14 | Go to Step 9 | ||||||||||||||||||
9 | Inspect the compressor. Does the compressor run continuously? | -- | Go to Step 11 | Go to Step 10 | ||||||||||||||||||
10 | The compressor cycles low or high. Replace the faulty pressure recycling switch. Is the repair complete? | -- | System OK | -- | ||||||||||||||||||
11 |
Does the A/C compressor run continuously while the low-side pressure drops below the specified value? | 69 kPa (10 psi) | Go to Step 12 | Go to Step 13 | ||||||||||||||||||
12 | Replace the faulty pressure cycling switch. Is the repair complete? | -- | Go to Step 14 | -- | ||||||||||||||||||
13 |
Is the blower motor reconnected? | -- | Go to Step 14 | -- | ||||||||||||||||||
14 |
Is the A/C outlet temperature within specified limits? | -- | Go to Step 15 | Go to Step 16 | ||||||||||||||||||
15 | The refrigeration system is operating properly. Verify that the control portion of the A/C system is operating properly. Refer to Functional Check . Did you perform the functional test? | -- | System OK | -- | ||||||||||||||||||
16 | Observe the compressor operation during the performance test. Does the compressor cycle? | -- | Go to Step 17 | Go to Step 18 | ||||||||||||||||||
17 |
Is the repair complete? | -- | System OK | -- | ||||||||||||||||||
18 |
Is the expansion orifice tube missing? | -- | Go to Step 19 | Go to Step 20 | ||||||||||||||||||
19 |
Is the repair complete? | -- | System OK | -- | ||||||||||||||||||
20 | Examine the suction line between the compressor and the pressure cycling switch. Did you find a restriction? | -- | Go to Step 21 | Go to Step 22 | ||||||||||||||||||
21 |
Is the repair complete? | -- | System OK | -- | ||||||||||||||||||
22 | A system overcharge is indicated. Recover and recharge the A/C system. Refer to Refrigerant Recovery and Recharging . Is the repair complete? | -- | System OK | -- |
Table 1: | Gray Area Diagnosis and Service |
Table 2: | Striped Area Diagnosis and Service |
Step | Action | Value(s) | Yes | No | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Inspect for any stored DTCs. Are any DTCs stored? | -- | Go to Step 2 | Go to Step 3 | ||||||||
2 | Correct any stored DTCs. Refer to DTC Table . Are all of the DTCs corrected? | -- | System OK | -- | ||||||||
3 | Connect the J 39500-B A/C Refrigerant Recovery Are pressures above the specified value? | 350 kPa (50 psi) | Go to Step 5 | Go to Step 4 | ||||||||
4 | The system is undercharged.
Is the cooling insufficient? | -- | Go to Step 5 | System OK | ||||||||
5 |
Are the A/C pressures and temperatures within specified limits? | 5°C (41°F) | Go to Step 6 | Go to Step 8 | ||||||||
6 | Did the customer indicate that either high temperature or high humidity caused the problem? | -- | Go to Step 7 | System OK | ||||||||
7 | The following conditions may cause high temperature or high humidity:
Did you complete the repair? | -- | System OK | -- | ||||||||
8 | Does the A/C compressor clutch engage? | -- | Go to System Performance Test |
Problem | Action | ||||||||
---|---|---|---|---|---|---|---|---|---|
DEFINITION: Inspect the following components if the pressure values intersect in the gray area of the chart. | |||||||||
The condenser operates improperly. | Improper condenser operation may result from the following conditions:
Clean or repair the components as necessary. | ||||||||
A high side refrigerant restriction exists. |
| ||||||||
The refrigerant system is overcharged. The following conditions are present:
| The clutch may cycle ON/OFF (see note). This condition may result in a noisy compressor.
| ||||||||
|
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NOTE: V5 clutch cycling may occur when the discharge pressure exceeds 2758 kPa (400 psi). |
Problem | Action | ||||||
---|---|---|---|---|---|---|---|
DEFINITION: Inspect the following components if pressure values intersect in the striped area of the chart. | |||||||
The compressor has internal damage. |
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The expansion (orifice) tube is missing. |
| ||||||
The compressor is at minimum stroke. | High Load TestIf the compressor discharge pressures remain only 69-207 kPa (10-30 psi) above the suction pressure, then the compressor may be at minimum stroke. Perform the following procedure:
| ||||||
The compressor control valve is set improperly. | Low Load TestThe low load test procedure creates a low cooling load. This condition causes the V5 compressor to operate toward minimum stroke. Use the following test procedure for evaluation of the control valve set point:
| ||||||
The refrigerant system is undercharged. | The refrigerant system may be undercharged when the suction pressure is below 241 kPa (35 psi) during the High Load Test. If the charge is low, the suction line before the accumulator will be warm.
Ensure that the pressure values are within the white (normal) area on the chart. If the pressure valves are normal, find the source of the refrigerant leak. Repair the leak as necessary. | ||||||
The expansion (orifice) tube is blocked. |
|