Combustion Type Power Heater System Terminals Of Ecu
CHECK HEATER ASSEMBLY
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
Combustion Type Power Heater System -- Terminals Of Ecu |
Measure the voltage, resistance and waveform according to the value(s) in the table below.
Terminal No. (Symbol)
| Wiring Color
| Terminal Description
| Condition
| Specified Condition
|
A97-1 (E) - Body ground
| W-B - Body ground
| Ground for main power supply
| Always
| Below 1 Ω
|
A97-2 (L) - Body ground
| R - Body ground
| Heater pump operation signal
| Engine idling
Power heater switch on
| Pulse generation
(See waveform 1)
|
A97-3 (IG) - Body ground
| W - Body ground
| Power heater operating signal
| Engine switch on (IG)
Power heater switch on
| 11 to 14 V
|
Engine switch on (IG)
Power heater switch off
| Below 1 V
|
A97-5 (B) - Body ground
| B - Body ground
| Power source
| Always
| 11 to 14 V
|
A97-8 (+) - Body ground
| G - Body ground
| Engine operating signal
| Engine idling
| 11 to 14 V
|
Using an oscilloscope, check waveform 1.
Heater Pump Control SignalItem
| Content
|
Terminal No. (Symbol)
| A97-2 (L) - Body ground
|
Tool Setting
| 2 V/DIV., 20 ms/DIV.
|
Condition
| Engine idling
Power heater switch on
|
| CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
Measure the voltage according to the value(s) in the table below.
Terminal No. (Symbol)
| Wiring Color
| Terminal Description
| Condition
| Specified Condition
|
G25-18 (HTR1) - G25-14 (GND)
| G - W-B
| Engine operating signal
| Engine idling
| 11 to 14 V
|
