Terminals Of Ecu [06/2018 - 08/2020]
- COMBINATION METER ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
Terminal No. (Symbol) Wiring Color Terminal Description Signal Input/Output Condition Specified Condition G17-2 (MSM+) - Body ground GR - Body ground Steering pad switch assembly signal Input Engine switch on (IG), OK and back switches on steering pad switch assembly not pushed 4.8 to 5.2 V G17-3 (MSTI) - Body ground R - Body ground Steering pad switch assembly signal Input Engine switch on (IG), up, down, right and left switches on steering pad switch assembly not pushed 4.8 to 5.2 V G17-4 (ODO) - Body ground LA-L - Body ground ODO/TRIP switch signal Input Engine switch on (IG), ODO/TRIP switch (trip switch) not pushed 4.8 to 5.2 V G17-7 (TX-) W Local bus communication line Input/Output - - G17-8 (TX+) G Local bus communication line Input/Output - - G17-9 (S) - Body ground LA-R - Body ground Engine oil pressure signal Input Engine not started → Engine started Below 1 V → 11 to 14 V G17-12 (RRSB) - Body ground LG - Body ground Rear seat belt buckle switch RH signal Input Engine switch on (IG), rear seat belt RH unfastened → Fastened Below 1 V → 11 to 14 V G17-13 (RCSB) - Body ground B - Body ground Rear seat belt buckle switch center signal Input Engine switch on (IG), rear seat belt center unfastened → Fastened Below 1 V → 11 to 14 V G17-14 (RLSB) - Body ground SB - Body ground Rear seat belt buckle switch LH signal Input Engine switch on (IG), rear seat belt LH unfastened → Fastened Below 1 V → 11 to 14 V G17-15 (OILW) - Body ground W - Body ground Engine oil level signal Input Engine switch on (IG), engine oil level not low → Engine oil level low Below 1 V → 11 to 14 V G17-16 (WLVL) - Body ground LG - Body ground Washer fluid level signal Input Engine switch on (IG), washer fluid level not low → Washer fluid level low 11 to 14 V → Below 1 V G17-17 (SW) - Body ground G - Body ground Brake fluid level signal Input Engine switch on (IG), brake fluid level not low (brake warning light off) → Brake fluid level low (brake warning light on) 11 to 14 V → Below 1 V G17-19 (+S) - Body ground L - Body ground Speed signal for other systems (Output) Output Engine switch on (IG), wheel being rotated Pulse generation (See waveform 1) G17-20 (SI) - Body ground W - Body ground Speed signal for other systems (Input) Input Engine switch on (IG), wheel being rotated Pulse generation (See waveform 1) G17-21 (IG+) - Body ground LA-GR - Body ground Engine switch signal - Engine switch off → Engine switch on (IG) Below 1 V → 11 to 14 V G17-22 (B) - Body ground LA-B - Body ground Battery - Always 11 to 14 V G17-23 (IND) - Body ground BE - Body ground Vacuum warning switch signal Input Engine started, vacuum warning switch off (brake warning light off) → Vacuum warning switch on (brake warning light on) 11 to 14 V → Below 1 V G17-25 (TR) - Body ground L - Body ground Light control rheostat switch signal Input Engine switch on (IG), light control rheostat up switch (trip switch) and light control rheostat down switch (trip switch) not pushed 4.8 to 5.2 V G17-26 (SW3) - Body ground LA-B - Body ground Ground for trip switch - Always Below 1 Ω G17-29 (CANH) B CAN communication line Input/Output - - G17-30 (CANL) W CAN communication line Input/Output - - G17-31 (ES) - Body ground W-B - Body ground Ground - Always Below 1 Ω G17-33 (FR) - G17-32 (FE) LG - BE Fuel level signal Input Engine switch on (IG), fuel level full → Fuel level low (fuel level warning light on) Pulse generation (See waveform 2) G17-34 (FV) - Body ground GR - Body ground Fuel sender gauge (Power source) - Engine switch on (IG) Pulse generation (See waveform 3) G17-39 (ILL-) - Body ground L - Body ground Illumination signal Output Taillights off → Taillights on Below 1 V → Pulse generation G17-40 (EP) - Body ground W-B - Body ground Ground - Always Below 1 Ω G16-1 (B) - Body ground LA-B - Body ground Battery - Always 11 to 14 V G16-2 (HZSW) - Body ground W - Body ground Hazard warning switch signal Input Hazard warning signal switch assembly off → Hazard warning signal switch assembly pushed 11 to 14 V → Below 1 V G16-5 (TRNR) - Body ground BE - Body ground Rear turn signal light RH signal Output RH turn indicator light off → RH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V G16-6 (INT) - Body ground L - Body ground Tire pressure warning ECU and receiver signal Output Engine switch on (IG), OK switch on steering pad switch not pushed 8 to 15 V G16-7 (LR) - Body ground LA-G - Body ground Front turn signal light RH signal Output RH turn indicator light off → RH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V G16-11 (TRNL) - Body ground BE - Body ground Rear turn signal light LH signal Output LH turn indicator light off → LH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V G16-12 (HAZM) - Body ground B - Body ground Hazard warning indicator light signal Input Engine switch on (IG), LH turn indicator light blinking → Hazard warning signal switch assembly pushed Below 1 V ←→ 11 to 14 V → Below 1 V G16-13 (LL) - Body ground LA-LG - Body ground Front turn signal light LH signal Output LH turn indicator light off → LH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V - Waveform 1:
Item Condition Tester connection - G17-20 (SI) - Body ground
- G17-19 (+S) - Body ground
Tool setting 5 V/DIV., 20 ms./DIV. Condition Engine switch on (IG), wheel being rotated HINT:
When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
- Waveform 2:
Item Condition Tester connection G17-33 (FR) - G17-32 (FE) Tool setting 2.5 V/DIV., 20 ms./DIV. Condition Engine switch on (IG), fuel level full → Fuel level low (fuel level warning light on) HINT:
- (A) varies depending on the fuel level.
- Engine switch on (IG), fuel level full (4.1 to 4.6 V) → Fuel level low (fuel level warning light on) (0.3 to 1.6 V)
- Waveform 3:
Item Condition Tester connection G17-34 (FV) - Body ground Tool setting 2.5 V/DIV., 20 ms./DIV. Condition Engine switch on (IG) HINT:
Engine switch on (IG) (4.5 to 5.5 V)
- Waveform 1:
- Measure the voltage and resistance and check for pulses according to the value(s) in the table below.