AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01CI8OE03

    Tech Tips

    Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A28-1 (PRS) - A28-4 (E) W - W-B Ignition power supply Ignition switch: ON 20 to 28 V
    A28-2 (TE) - A28-10 (SG) L - R Evaporator temperature sensor signal Ignition switch: ON 2.0 to 2.4 V → 1.4 to 1.8 V
    Temperature near evaporator: 0 (32°F) → 15°C (59°F)
    A28-3 (ACT) - A28-4 (E) G - W-B A/C compressor cut signal Ignition switch: ON → Engine idling Below 1 V → 20 to 28 V
    A28-4 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
    A28-5 (A/C) - A28-4 (E) B - W-B A/C switch signal Ignition switch: ON Below 1 V → 20 to 28 V
    A/C switch: ON
    Blower switch: 0 → 1
    A28-6 (B/V) - A28-10 (SG) L - R Evaporator temperature sensor signal Ignition switch: ON 2.0 to 2.4 V → 1.4 to 1.8 V
    Temperature near evaporator: 0 (32°F) → 15°C (59°F)
    A28-7 (IG+) - A28-4 (E) W - W-B Ignition power supply Ignition switch: ON 20 to 28 V
    A28-9 (MGC) - A28-4 (E) V - W-B A/C compressor magnetic clutch operation signal Engine idling Below 1 V → 20 to 28 V
    A/C switch: ON
    Blower switch: 0 → 1
    A28-10 (SG) - Body ground R - Body ground Ground for evaporator temperature sensor Always Below 1 Ω

    • If the result is not as specified, there may be a malfunction in the wire harness.

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