15. A/C system trouble Table 1-65 17. Cylinder misfiring Table 1-66 86 S/N Operation Test Results Actions 1 Check if the refrigerant of the A/C system is enough. Check the A/C belt, clutch, pressure switch for normal operation. Yes Next step No Remove the trouble 2 Run the engine at an idle speed. Turn on the A/C switch. Check if the A/C thermal resistance is under trouble with a diagnostic instrument. Yes Remove the trouble No Next step 3 Turn on the A/C switch. Connect an adapter between the ECU and the harness. Check the pin J1-09 and J1-39 (A/C switch) of the ECU for signal input.
Yes Next step No Check harness 4 If the vehicle adopts low-level control, turn off the A/C and check if it still keeps operation. Yes Replace bulb or repair harness No Next step 5 Check the pin J1-46 (grounding end connected to the vibration absorption coil of the A/C relay) of the ECU for low-level output. Yes Repair A/C relay and harness No Replace ECU S/N Operation Test Results Actions 1 Start the engine, and run the engine under idle speed. Check the sound for air leakage of the air intake pipe. Yes Next step No Check and repair the leakage 2 Stop the engine and carry out visual inspection for the exhaust pipe, three-way catalystor and the muffler.
Yes Next step No Repair or replace 3 Take out the connector of each ignition coil in sequence. Check if no decrease of the rotation speed of the engine is produced at any moment for the cylinder. Yes 5 No Next step 4 Check if there is running sound for each fuel injector at idle speed. Yes Next step No Check fuel injector and relevant circuits