A/C Signal Circuit Troubleshooting (2017 2018 2019)
- 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.
NO
- A/C system check
-1. 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. Turn the vehicle to the OFF (LOCK) mode.
-2. Turn the vehicle to 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 (ACC line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Jump the SCS line with the HDS, and wait more than 1 minute.
-3. Disconnect the following connector.
PCM connector A (51P) -4. Turn the vehicle to the ON mode.
-5. Connect terminals A and B with a jumper wire.
Terminal A PCM connector A (51P) No. 23 Terminal B Body ground Is there a clicking noise from the A/C compressor clutch?
YES
The ACC wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM .
NO
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 an open in the ACC wire between the PCM (A23) and the A/C compressor clutch relay, or other parts in the A/C systems.