( TL19E00G10110112012FAAT00 )

A/C Compressor Clutch Circuit Troubleshooting

NOTE:

- It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine coolant temperature, hard acceleration, or high/low pressure.
- Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the symptom troubleshooting index.
- Before doing any symptom troubleshooting, check for powertrain DTCs, R20A3 engine model, K24Z3 engine model.

1. Check the No. 20 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Are the fuses OK?

YES | - | Go to Step 2 .
NO | - | Replace the fuse(s) and recheck. If the fuse(s) blow again, check for a short in the No. 20 (7.5 A) fuse and the No. 16 (7.5 A) fuse circuits.■

1. Connect the HDS to the DLC.

1. Check for these PGM-FI DTCs: P0117, P0118, P0506, P0507, P0532, and P0533.

Are any of these DTCs indicated?

YES | - | Go to the appropriate troubleshooting section.
NO | - | Go to Step 4 .

1. Start the engine, then turn on the A/C.

1. Check the A/C CLUTCH in the PGM-FI Data List with the HDS.

Is the A/C CLUTCH on?

YES | - | Go to Step 7 .
NO | - | Go to Step 6 .

1. Using the HDS, confirm the following values in the PGM-FI Data List at idle.

   TP SENSOR | About 0.5 V
   RPM | R20A3 engine model (A/T) | 600−700
   R20A3 engine model (M/T) | 630−730
   K24Z3 engine model (A/T) | 750−850
   K24Z3 engine model (M/T) | 700−800
   ECT SENSOR 2 | 80−100 °C (176−212 °F)
   A/C SWITCH | ON
   A/C CLUTCH | ON
   A/C PRESSURE SENSOR | 196−3,138 kPa (2−32 kgf/cm 3 ) [28−455 psi]

Are all the values within specifications?

YES | - | Go to Step 7 .
NO | - | Troubleshoot the value that is not within the specifications.■

1. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it.

Is the relay OK?

YES | - | Go to Step 8 .
NO | - | Replace the A/C compressor clutch relay .■

1. Measure the voltage between the A/C compressor clutch relay 4P socket No. 1 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 9 .
NO | - | Replace the under-hood fuse/relay box. ■

1. Connect the A/C compressor clutch relay 4P socket No. 1 and No. 2 terminals with a jumper wire.

Does the A/C compressor clutch click?

YES | - | Go to Step 10 .
NO | - | Go to Step 19 .

1. Disconnect the jumper wire.

1. Turn the ignition switch to ON (II).

1. Measure the voltage between the A/C compressor clutch relay 4P socket No. 4 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 13 .
NO | - | Repair open in the wire between the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box and the A/C compressor clutch relay.■

1. Turn the ignition switch to LOCK (0).

1. Reinstall the A/C compressor clutch relay.

1. Jump the SCS line with the HDS.
   NOTE: This step must be done to protect the powertrain control module (ECM/PCM) from damage.

1. Disconnect ECM/PCM connector A (44P) (R20A3 engine model) or ECM/PCM connector A (49P) (K24Z3 engine model).

1. Connect the ECM/PCM connector A (44P) No. 14 terminal (R20A3 engine model) or ECM/PCM connector A (49P) No. 15 terminal (K24Z3 engine model) to body ground with a jumper wire.

1. Turn the ignition switch to ON (II).

Does the A/C compressor click?

YES | - | Check for loose wires or poor connections at ECM/PCM connector A (44P) (R20A3 engine model) or ECM/PCM connector A (49P) (K24Z3 engine model). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM, R20A3 engine model, K24Z3 engine model. ■
NO | - | Repair open in the wire between the A/C compressor clutch relay and the ECM/PCM.■

1. Disconnect the jumper wire.

1. Disconnect the A/C compressor clutch 3P connector.

1. Check for continuity between the A/C compressor clutch relay 4P socket No. 2 terminal and the A/C compressor clutch 3P connector No. 2 terminal (R20A3 engine model) or A/C compressor clutch 3P connector No. 3 terminal (K24Z3 engine model).

Is there continuity?

YES | - | Check the A/C compressor clutch clearance, A/C compressor clutch field coil, and the A/C compressor thermal protector. Repair as needed.■
NO | - | Repair open in the wire between the A/C compressor clutch relay and the A/C compressor clutch.■