| Last Modified: 11-27-2007 | 1.6 U | |
| Service Category: Engine/Hybrid System | Section: Cruise Control | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000000PLR012X |
| Title: CRUISE CONTROL: CRUISE CONTROL SYSTEM: TERMINALS OF ECU (2008 LX570) | ||
TERMINALS OF ECU
1. CHECK ECM
HINT:
As the ECM connector is a waterproof connector, it is not possible to check the voltage of each terminal or check the waveform with an oscilloscope while the ECM is installed in the vehicle.
(a) Disconnect the A38 and C53 ECM connectors.
(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 |
|---|---|---|---|---|
|
A38-16 (TC) - Body ground |
V-W - Body ground |
Terminal TC of DLC3 |
Engine switch on (IG) |
11 to 14 V |
|
Engine switch off |
Below 1 V |
|||
|
C53-81 (E1) - Body ground |
W-B - Body ground |
ECM ground |
Always |
Below 1 Ω |
|
C53-27 (D) - Body ground |
G - Body ground |
Park/neutral position switch signal |
Engine switch on (IG) Shift lever in D |
11 to 14 V |
|
Engine switch on (IG) Shift lever not in D |
Below 1 V |
|||
|
A38-38 (SFTU) - Body ground |
Y - Body ground |
Park/neutral position switch signal |
Engine switch on (IG) Shift lever in S |
Below 1 Ω |
|
Engine switch on (IG) Shift lever in + |
10 kΩ or higher |
|||
|
A38-25 (S) - Body ground |
W - Body ground |
Park/neutral position switch signal |
Engine switch on (IG) Shift lever in S |
11 to 14 V |
|
Engine switch on (IG) Shift lever not in S |
Below 1 V |
|||
|
A38-27 (SFTD) - Body ground |
L - Body ground |
Park/neutral position switch signal |
Engine switch on (IG) Shift lever in S |
10 kΩ or higher |
|
Engine switch on (IG) Shift lever in - |
Below 1 Ω |
|||
|
A38-36 (STP) - Body ground |
R - Body ground |
Stop light signal |
Engine switch on (IG) Brake pedal depressed |
11 to 14 V |
|
Engine switch on (IG) Brake pedal released |
Below 1 V |
|||
|
A38-35 (ST1-) - Body ground |
R-W - Body ground |
Stop light signal (opposite to STP terminal) |
Engine switch on (IG) Brake pedal depressed |
Below 1 V |
|
Engine switch on (IG) Brake pedal released |
11 to 14 V |
|||
|
A38-45 (CCS) - Body ground |
L - Body ground |
Cruise control main switch signal |
Engine switch on (IG) Main switch off |
1 MΩ or higher |
|
Engine switch on (IG) CANCEL switch held on |
1510 to 1570 Ω |
|||
|
Engine switch on (IG) -SET switch held on |
620 to 640 Ω |
|||
|
Engine switch on (IG) +RES switch held on |
235 to 245 Ω |
|||
|
Engine switch on (IG) Main switch on |
Below 2.5 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
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