Toyota 4Runner manuals

Toyota 4Runner: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK NO. 1 AIR CONDITIONING AMPLIFIER ASSEMBLY


(a) Disconnect the F42 No. 1 air conditioning amplifier assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F42-21 (B) - F42-14 (GND)

V - W-B

Battery power source

Always

11 to 14 V

F42-1 (IG+) - F42-14 (GND)

L - W-B

Ignition power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

F42-14 (GND) - Body ground

W-B - Body ground

Ground for main power supply

Always

Below 1 Ω

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

(c) Reconnect the F42 No. 1 air conditioning amplifier assembly connector.

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F42-3 (PTC1) - Body ground

V - Body ground

PTC NO. 1 relay operation signal

  • Engine running (1250 rpm or more)
  • Temperature setting MAX HOT
  • Outside temperature 10°C (50°F) or less
  • Engine coolant temperature 79°C (174°F) or less
  • Headlight dimmer switch off
  • Blower switch on

11 to 14 V*

F42-4 (PTC3) - Body ground

P - Body ground

PTC NO. 3 relay operation signal

  • Engine running (1250 rpm or more)
  • Temperature setting MAX HOT
  • Outside temperature 10°C (50°F) or less
  • Engine coolant temperature 73°C (163°F) or less
  • Headlight dimmer switch off
  • Blower switch on

11 to 14 V*

F42-5 (TAM) - F42-13 (SG-2)

V - G

Cooler thermistor (ambient temperature sensor) signal

  • Ignition switch ON
  • Ambient temperature 25°C (77°F)

1.35 to 1.75 V

F42-5 (TAM) - F42-13 (SG-2)

V - G

Cooler thermistor (ambient temperature sensor) signal

  • Ignition switch ON
  • Ambient temperature 40°C (104°F)

0.9 to 1.2 V

F42-8 (LOCK) - F42-13 (SG-2)

R - G

A/C compressor lock sensor signal

  • Engine running
  • Blower switch LO
  • A/C switch on

Pulse generation

(See waveform 1)

F42-9 (PRE) - Body Ground

G - Body Ground

No. 1 pressure switch signal

  • Ignition switch ON
  • Refrigerant pressure normal (below 3140 kPa [32.0 kgf/cm2, 455 psi] and higher than 196 kPa [2.0 kgf/cm2, 28 psi])

Below 1 V

F42-9 (PRE) - Body Ground

G - Body Ground

No. 1 pressure switch signal

  • Ignition switch ON
  • Refrigerant pressure abnormal (below 196 kPa [2.0 kgf/cm2, 28 psi] or higher than 3140 kPa [32.0 kgf/cm2, 455 psi])

4.69 V or higher

F42-17 (AC1) - F42-14 (GND)

LG - W-B

Compressor operation signal

  • Ignition switch ON
  • A/C switch on

Below 1 V

F42-18 (MHTR) - F42-14 (GND)

G - W-B

MIR HTR relay signal

  • Ignition switch ON
  • Mirror heater switch on

Below 1 V

F42-20 (MGC) - F42-14 (GND)

R - W-B

Magnet clutch assembly operation signal

  • Ignition switch ON
  • Blower switch LO
  • A/C switch on

Below 1 V

F42-22 (PTC2) - Body ground

LG - Body ground

PTC NO. 2 relay operation signal

  • Engine running (1250 rpm or more)
  • Temperature setting MAX HOT
  • Outside temperature 10°C (50°F) or less
  • Engine coolant temperature 76°C (169°F) or less
  • Headlight dimmer switch off
  • Blower switch on

11 to 14 V*

F42-23 (BLW) - F42-14 (GND)

LG - W-B

Blower with fan motor sub-assembly control signal

  • Ignition switch ON
  • Blower switch LO

Pulse generation

(See waveform 2)

F42-25 (ALT) - F42-14 (GND)

L - W-B

Generator signal (PTC heater control)

Engine started

Pulse generation

F42-27 (ACT) - F42-14 (GND)

SB - W-B

Compressor operation signal

  • Ignition switch ON
  • A/C switch on

4.75 to 5.25 V

z15-2 (BUS G) - Body ground

-

Ground for BUS IC

Always

Below 1 V

z15-3 (BUS) - z15-2 (BUS G)

-

BUS IC control signal

Ignition switch ON

Pulse generation

z15-4 (B BUS) - z15-2 (BUS G)

-

Power supply for BUS IC

Always

11 to 14 V

z15-6 (TE) - z15-5 (SG-3)

-

No. 1 cooler thermistor signal

  • Ignition switch ON
  • Evaporator temperature 0°C (32°F)

1.7 to 2.1 V

  • Ignition switch ON
  • Evaporator temperature 15°C (59°F)

0.9 to 1.3 V

HINT:

*: After the measurement conditions are met, wait 30 seconds before performing measurements.

  • If the result is not as specified, the No. 1 air conditioning amplifier assembly may have a malfunction.

(e) Using an oscilloscope, check waveform 1.

A/C Compressor Lock Sensor Signal

Item

Content

Terminal No. (Symbol)

F42-8 (LOCK) - F42-13 (SG-2)

Tool Setting

200 mV/DIV., 10 ms./DIV.

Condition

  • Engine running
  • A/C switch on
  • Blower switch LO

(f) Using an oscilloscope, check waveform 2.

Blower Motor Control Signal

Item

Content

Terminal No. (Symbol)

F42-23 (BLW) - F42-14 (GND)

Tool Setting

1 V/DIV., 500 μs/DIV.

Condition

  • Ignition switch ON
  • Blower switch LO

HINT:

When the blower level is increased, the duty ratio changes accordingly.

2. CHECK HEATER CONTROL ASSEMBLY


(a) Disconnect the F29 heater control assembly connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F29-4 (IG+) - F29-11 (GND)

L - W-B

IG power supply

Ignition switch ON

11 to 14 V

F29-11 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

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

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