A/C Signal Circuit Troubleshooting (Idle Control System) (2013-15)

A/C compressor clutch condition check:

- 1.Start the engine, and let it idle.

- 2. Turn the blower switch on.

- 3. Turn the A/C switch on.

- 4. Check the parameter(s) below with the HDS.

Signal	Threshold	Current conditions
Values	Unit	Values	Unit
A/C CLUTCH	ON

Do the current condition(s) match the threshold?

YES

Go to step 2.

Do the A/C system test .?

A/C system check:
Check the A/C system.

Does the A/C system operate?

YES

The A/C system circuit is OK.?

NO

Go to step 3.
A/C compressor clutch circuit check:
- 1. Press the engine start/stop button to select the OFF mode.

- 2. Press the engine start/stop button to select the ON mode.

- 3. Activate the A/C CLUTCH in the INSPECTION MENU with the HDS.

A/C CLUTCH

Is there a clicking noise from the A/C compressor clutch?

YES

The A/C compressor clutch circuit is OK. Do the A/C system test .?

NO

Go to step 4.

Open wire check (A/C MG CLUTCH RLY CL- line):

- 1. Press the engine start/stop button to select the OFF mode.

- 2. Jump the SCS line with the HDS.

SCS Short

- 3. Disconnect the following connector.

PCM connector A (49P) - Refer to: How to Troubleshoot the Fuel and Emissions Systems (2013-15), or How to Troubleshoot the A/T System (2013-15)

- 4. Press the engine start/stop button to select the ON mode.

- 5. Connect terminals A and B with a jumper wire.

Terminal A	PCM connector A (49P) No. 23 (RED)
Terminal B	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there a clicking noise from the A/C compressor clutch?

YES

The A/C MG CLUTCH RLY CL- wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM .?

Check for poor connections or loose terminals at the A/C compressor clutch relay and the PCM. If the connections and terminals are OK, check the A/C compressor clutch relay. If needed, repair open in the A/C MG CLUTCH RLY CL- wire between the PCM (A23) and the A/C compressor clutch relay, or other parts in the A/C systems.?