Compressor Clutch Circuit Troubleshooting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Honda Odyssey, 2003 Honda Odyssey, 2002 Honda Odyssey, 2001 Honda Odyssey, and 2000 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the Symptom Troubleshooting Index .
Before performing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Check the No. 59 (7.5A) fuse in the under-hood fuse/relay box, and the No. 3 (7.5A) fuse in the driver's under-dash fuse/relay box.
Are the fuses OK?
1. YES - Go to step 2.
2. NO - Replace the fuse(s) and recheck.
Check the engine coolant temperature, throttle position, and idle speed (Use the HDS PGM-FI data list if possible).

Fig 1: Engine Coolant Temperature Diagnosis Chart
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the coolant temperature throttle position and idle speed ?
1. YES - Go to step 3.
2. NO - Troubleshoot and repair cause of high engine coolant temperature, low idle, or excessively high throttle position sensor reading.
Remove the compressor clutch relay from the under-hood fuse/relay box, and test it (see RELAYS ).
Is the relay OK?
1. YES - Go to step 4.
2. NO - Replace the compressor clutch relay.
Measure the voltage between the No. 1 terminal of the compressor clutch relay 4P socket and body ground.

Fig 2: Measuring Voltage Between No. 1 Terminal Of Compressor Clutch Relay 4P Socket & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 5.
2. NO - Replace the under-hood fuse/relay box.
Connect the No. 1 and No. 2 terminals of the compressor clutch relay 4P socket with a jumper wire.

Fig 3: Connecting No. 1 & No. 2 Terminals Of Compressor Clutch Relay 4P Socket With A Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the compressor clutch click?
1. YES - Go to step 6.
2. NO - Go to step 15.
Disconnect the jumper wire.
Turn the ignition switch ON (II).
Measure the voltage between the No. 4 terminal of the compressor clutch relay 4P socket and body ground.

Fig 4: Measuring Voltage Between No. 4 Terminal Of Compressor Clutch Relay 4P Socket & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 9.
2. NO - Repair open in the wire between the No. 3 fuse in the driver's under-dash fuse/relay box and the compressor clutch relay.
Turn the ignition switch OFF.
Reinstall the compressor clutch relay.
Make sure the A/C switch is OFF.
Turn the ignition switch ON (II).
'99-00 and '02-04 models: Using the Backprobe Set, measure the voltage between the No. 17 terminal of PCM connector A (32P) and body ground with the PCM connectors connected.
'01 model: Using the Backprobe Set, measure the voltage between the No. 12 terminal of PCM connector E (31P) and body ground with the PCM connector connected.

Fig 5: Measuring Voltage Between No. 17 Terminal Of PCM Connector A (32P) & Body Ground With PCM Connectors Connected (1999-2000 & 2002-04 Models)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 6: Measuring Voltage Between No. 12 Terminal Of PCM Connector E (31P) & Body Ground With PCM Connector Connected (2001 Model)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 14.
2. NO - Repair open in the wire between the compressor clutch relay and the PCM.
'99-00 and '02-04 models: Using the Backprobe Set, measure the voltage between the No. 27 terminal of PCM connector A (32P) and body ground with the PCM connectors connected.
'01 model: Using the Backprobe Set, measure the voltage between the No. 21 terminal of PCM connector E (31P) and body ground with the PCM connector connected.

Fig 7: Measuring Voltage Between No. 27 Terminal Of PCM Connector A (32P) & Body Ground With PCM Connectors Connected (1999-2000 & 2002-04 Models)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 8: Measuring Voltage Between No. 21 Terminal Of PCM Connector E (31P) & Body Ground With PCM Connector Connected (2001 Model)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Check for loose wires or poor connections at PCM connector A (32P) or E (31P). If the connections are good, substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original PCM.
2. NO - Repair open in the wire between the PCM and the A/C pressure switch.
Disconnect the jumper wire.
Disconnect the compressor clutch 1P connector.
Check for continuity between the No. 2 terminal of the compressor clutch relay 4P socket and the No. 1 terminal of the compressor clutch 1P connector.

Fig 9: Checking Continuity Between No. 2 Terminal Of Compressor Clutch Relay 4P Socket & No. 1 Terminal Of Compressor Clutch 1P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Check the compressor clutch clearance and the compressor clutch field coil (see page 21-51). Repair as needed.
2. NO - Repair open in the wire between the compressor clutch relay and the compressor clutch.