TERMINALS OF ECU
CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY
NOTICE:
(a) Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
A70-1 (SGND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
A70-8 (IGB) - A70-1 (SGND) | G - W-B | Power source | Engine switch on (IG) | 11 to 14 V |
Engine switch off | Below 1 V |
(b) Check for pulses according to the value(s) in the table below.
HINT:
If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the millimeter wave radar sensor assembly is suspected.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
A70-2 (CA2L) - A70-1 (SGND) | V - W-B | CAN communication signal | Engine switch on (IG) | Pulse generation (See waveform 2) |
A70-3 (CA2H) - A70-1 (SGND) | BR - W-B | CAN communication signal | Engine switch on (IG) | Pulse generation (See waveform 1) |
A70-5 (CA1P) - A70-1 (SGND) | L - W-B | CAN communication signal | Engine switch on (IG) | Pulse generation (See waveform 1) |
A70-6 (CA1N) - A70-1 (SGND) | GR - W-B | CAN communication signal | Engine switch on (IG) | Pulse generation (See waveform 2) |
(1) Waveform 1
Item | Content |
---|---|
Tester Connection |
|
Tool Setting | 1 V/DIV., 10 μs./DIV. |
Condition | Engine switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
(2) Waveform 2
Item | Content |
---|---|
Tester Connection |
|
Tool Setting | 1 V/DIV., 10 μs./DIV. |
Condition | Engine switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
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