Circuit Description
Ignition voltage is supplied directly to the A/C compressor clutch relay coil. The PCM controls the relay by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the controlled component. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage). If the fault detection circuit senses a voltage other than what the circuit expects, the fault line status changes causing the DTC to set.
The relay controls the high current flow to the A/C compressor clutch. This allows the PCM driver to only have to handle the relatively low current used by the relay.
Conditions for Running the DTC
| • | DTCs P0113, P0500, P0502, P0560, P0562, P1133, P1153, P1154 are not set. |
| • | The engine speed is greater than 600 RPM. |
Conditions for Setting the DTC
| • | The PCM detects that the commanded state of the driver and the actual state of the control circuit do not match. |
| • | All conditions present for a minimum of 10.0 seconds. |
Action Taken When the DTC Sets
| • | The powertrain control module (PCM) stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records. |
Conditions for Clearing the DTC
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids
Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. For an intermittent condition, refer to Symptoms .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Listen for an audible click when the relay operates. Command both the ON and the OFF states as necessary.
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In order to detect excessive current flow energize the relay for 2 minutes. Energizing the relay for 2 minutes warms the relay coil. When the relay is warm the coil may open (the current draw drops to 0), or short (the current goes above 0.75 Amps).
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Identify and test the correct relay coil terminals to avoid improper diagnosis.
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Listen for an audible click when the relay operates. Repeat the procedure as necessary.
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If no trouble is found in the control circuit or the connection at the PCM, the PCM may be faulty, however, this is an extremely unlikely failure.
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The repair is not complete if the scan tool indicates that the diagnostic ran and failed.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
Does the relay turn ON and OFF when commanded? | -- | |||
Important: If the DMM goes to 0 replace the relay. Does the current draw measure less than the value shown (but not 0)? | 0.75A | Go to Diagnostic Aids | ||
4 |
Important: For underhood electrical center relay terminal identification, refer to Electrical Center Identification Views in Wiring Systems.
Does the DMM display infinite resistance? | -- | ||
|
Important: For underhood electrical center relay terminal identification, refer to Electrical Center Identification Views in Wiring Systems.
Does the test lamp turn ON and OFF with each command? | -- | |||
6 | Probe the A/C Clutch relay ignition feed circuits in the underhood electrical center 2 with the test lamp J 35616-200 connected to a ground. Does the test lamp illuminate for both circuits? | -- | ||
Does the relay turn ON when the circuit is grounded and OFF when the circuit is opened? | -- | |||
8 |
Did you find and correct the condition? | -- | ||
9 |
Did you find and correct the condition? | -- | ||
10 | Repair the faulty relay control circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
11 | Repair the faulty relay battery feed circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
12 | Replace the A/C clutch relay. Refer to Compressor Relay Replacement in HVAC Systems Manual. Is the action complete? | -- | -- | |
|
Important:: Program the replacement PCM. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete? | -- | -- | ||
Does the scan tool indicate that this test passed? | -- | |||
15 | Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to the applicable DTC table | System OK |
