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12.10 Unsteady Idle Speed or Extinguish with Load (A/C etc.)
Yes Remove the failure displayed 1 Put the ignition switch to “ON”. Use a failure diagnostic tester to check if any failure information record exists. No Next step Yes Next step 2 Turn on A/C switch, connect an adaptor between ECU and harness, and then measure 75# pin of ECU to see if input signal is present (high potential signal loaded by A/C switch through high and low voltage switches). No Check and repair air conditioning circuit Yes Next step 3 Check if the pressure of air conditioning system, the electromagnetic clutch of compressor and the air conditioning pump are in right conditions. No Repair or replace Yes Next step 4 Check the voltage on 64#, 65#, 66# and 67# pins of ECU (for control of DC motor) as well as corresponding pins on valve body is normal. No Check controlling circuit Yes Check the electric throttle body 5 Remove electronic throttle body and check if throttle is locked or is dumb to run. No Next step Yes Replace ECU 6 Start engine, turn on A/C, use a failure diagnosis tester to read such signals as air intake flow and engine revolution and check if engine acceleration occurs. No Replace the electronic throttle body
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