15. A/C system trouble
Table 1-65
S/N Operation Test Results Actions
Yes Next step
1
Check if the refrigerant of the A/C system is enough.
Check the A/C belt, clutch, pressure switch for normal
operation.
No Remove the trouble
Yes 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.
No Next step
Yes 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.
No Check harness
Yes
Replace bulb or repair
harness
4
If the vehicle adopts low-level control, turn off the A/C and
check if it still keeps operation.
No Next step
Yes
Repair A/C relay and
harness
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.
No Replace ECU
17. Cylinder misfiring
Table 1-66
S/N Operation Test Results Actions
Yes Next step
1
Start the engine, and run the engine under idle speed.
Check the sound for air leakage of the air intake pipe.
No
Check and repair the
leakage
Yes Next step
2
Stop the engine and carry out visual inspection for the
exhaust pipe, three-way catalystor and the muffler.
No Repair or replace
Yes 5
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.
No Next step
Yes Next step
4
Check if there is running sound for each fuel injector at
idle speed.
No
Check fuel injector and
relevant circuits
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