ECD SYSTEM TERMINALS OF ECM
Tech Tips
Each ECM terminal's standard voltage is shown in the table below.
In the table, first follow the information under "Condition". Look under "Terminal No. (Symbol)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specified Condition".
Use the illustration above as a reference for the ECM terminals.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G185-1 (BATT) - C152-1 (E1) | L - W-B | Battery (for measuring the battery voltage and for the ECM memory) | Always | 11 to 14 V |
| G185-18 (IGSW) - C152-1 (E1) | W - W-B | Engine switch | Engine switch on (IG) | 11 to 14 V |
| G185-2 (+B) - C152-1 (E1) | W - W-B | Power source of ECM | Engine switch on (IG) | 11 to 14 V |
| G185-3 (+B2) - C152-1 (E1) | W - W-B | Power source of ECM | Engine switch on (IG) | 11 to 14 V |
| G185-4 (+B3) - C152-1 (E1) | W - W-B | Power source of ECM | Engine switch on (IG) | 11 to 14 V |
| G184-14 (MREL) - C152-1 (E1) | V - W-B | EFI MAIN1 relay operation signal | Engine switch on (IG) | 11 to 14 V |
| 10 seconds elapsed after engine switch off | 0 to 1.5 V | |||
| C151-5 (+BD1) - C152-1 (E1) | B - W-B | EDU relay operation signal | Engine switch on (IG) | 11 to 14 V |
| C151-4 (+BD2) - C152-1 (E1) | B - W-B | EDU relay operation signal | Engine switch on (IG) | 11 to 14 V |
| G184-15 (GREL) - C152-1 (E1) | R - W-B | GLOW relay | Cranking | 11 to 14 V |
| Idling (10 seconds or more after engine start) | 0 to 1.5 V | |||
| G185-29 (VCPA) - G185-22 (EPA) | LG - P | Power source of accelerator pedal position sensor (for VPA) | Engine switch on (IG) | 4.5 to 5.5 V |
| G185-30 (VCP2) - G185-25 (EPA2) | R - W | Power source of accelerator pedal position sensor (for VPA2) | Engine switch on (IG) | 4.5 to 5.5 V |
| G185-28 (VPA) - G185-22 (EPA) | L - P | Accelerator pedal position sensor (for engine control) | Engine switch on (IG), accelerator pedal fully released | 0.5 to 1.1 V |
| Engine switch on (IG), accelerator pedal fully depressed | 3.0 to 4.6 V | |||
| G185-31 (VPA2) - G185-25 (EPA2) | GR - W | Accelerator pedal position sensor (for sensor malfunction detection) | Engine switch on (IG), accelerator pedal fully released | 0.9 to 2.3 V |
| Engine switch on (IG), accelerator pedal fully depressed | 3.4 to 5.0 V | |||
| C150-25 (VCVG) - C150-24 (EVG) | R - G | Power source of mass air flow meter sub-assembly (for VG) | Engine switch on (IG) | 4.8 to 5.2 V |
| C150-33 (VG) - C150-24 (EVG) | W - G | Mass air flow meter sub-assembly signal | Engine switch on (IG) | Pulse generation (See waveform 1) |
| C150-32 (THA) - C150-24 (EVG) | Y-B - G | Intake air temperature sensor (built into mass air flow meter sub-assembly) | Idling, intake air temperature at 20°C (68°F) | 0.5 to 3.4 V |
| C150-35 (THIA) - C150-27 (ETHI) | B - BR | Intake air temperature sensor (turbo) | Idling, intake air temperature at 0 to 80°C (32 to 176°F) | 0.5 to 3.4 V |
| C149-34 (THW) - C149-27 (ETHW) | R-L - BR | Engine coolant temperature sensor | Idling, engine coolant temperature at 80°C (176°F) | 0.2 to 1.0 V |
| G184-22 (STA) - C152-1 (E1) | W - W-B | Starter signal | Cranking | 6.0 V or higher |
| C149-6 (#1D+) - C149-7 (#1D-) | W - B | No. 1 injector assembly signal | Idling | Pulse generation (See waveform 2) |
| C149-1 (#2D+) - C149-2 (#2D-) | V - P | No. 2 injector assembly signal | ||
| C150-7 (#3D+) - C150-6 (#3D-) | L - LG | No. 3 injector assembly signal | ||
| C149-5 (#4D+) - C149-4 (#4D-) | G - L | No. 4 injector assembly signal | ||
| C152-17 (VCG) - C152-18 (G2-) | B - L | Power source of camshaft position sensor (specific voltage) | Engine switch on (IG) | 4.5 to 5.5 V |
| C152-27 (G2+) - C152-18 (G2-) | GR - L | Camshaft position sensor | Idling | Pulse generation (See waveform 3) |
| C152-20 (VCNE) - C152-19 (NE-) | R - L | Power source of crankshaft position sensor (specific voltage) | Engine switch on (IG) | 4.5 to 5.5 V |
| C152-28 (NE+) - C152-19 (NE-) | W - L | Crankshaft position sensor | Idling | Pulse generation (See waveform 4) |
| G185-13 (STP) - C152-1 (E1) | V - W-B | Stop light switch assembly | Engine switch on (IG), brake pedal depressed | 7.5 to 14 V |
| Engine switch on (IG), brake pedal released | 0 to 1.5 V | |||
| G185-12 (ST1-) - C152-1 (E1) | B - W-B | Stop light switch assembly (opposite to STP) |
Engine switch on (IG), brake pedal depressed | 0 to 1.5 V |
| Engine switch on (IG), brake pedal released | 7.5 to 14 V | |||
| G184-25 (TC) - C152-1 (E1) | V - W-B | Terminal TC of DLC3 | Engine switch on (IG) | 11 to 14 V |
| G184-10 (SPD) - C152-1 (E1) | R - W-B | Speed signal from combination meter assembly | Engine switch on (IG), slowly wheel rotated | Pulse generation (See waveform 5) |
| C149-28 (VCPM) - C149-19 (EPIM) | R - B | Power source of manifold absolute pressure sensor (specific voltage) |
Engine switch on (IG) | 4.5 to 5.5 V |
| C149-18 (PIM) - C149-19 (EPIM) | L-B - B | Manifold absolute pressure sensor | Negative pressure of 40 kPa (300 mmHg, 11.8 in.Hg) applied | 0.1 to 0.7 V |
| Same as atmospheric pressure | 0.8 to 1.5 V | |||
| Positive pressure of 170 kPa (1275 mmHg, 50.2 in.Hg) applied | 1.6 to 2.3 V | |||
| G184-16 (TACH) - C152-1 (E1) | P - W-B | Engine speed | Idling | Pulse generation (See waveform 6) |
| C151-28 (VCM) - C151-19 (E2M) | Y-B - GR | Power source of fuel pressure sensor (for PCR1) | Engine switch on (IG) | 4.5 to 5.5 V |
| C151-18 (PCR1) - C151-19 (E2M) | R - GR | Fuel pressure sensor (main) | Idling | 1.8 to 2.1 V |
| C152-33 (VCS) - C152-25 (E2S) | LG - L | Power source of fuel pressure sensor (for PCR2) | Engine switch on (IG) | 4.5 to 5.5 V |
| C152-26 (PCR2) - C152-25 (E2S) | Y - L | Fuel pressure sensor (sub) | Idling | 1.2 to 1.5 V |
| C150-3 (PCV+) - C150-4 (PCV-) | W - B | Pre-stroke control valve operation signal | Idling | Pulse generation (See waveform 7) |
| C150-2 (PRV+) - C150-1 (PRV-) | Y - G | Pressure discharge valve signal | Engine switch turned off after idling | Pulse generation |
| C151-1 (VNM+) - C152-1 (E1) | W - W-B | DC motor signal (turbocharger nozzle vane control actuator) |
Idling | Pulse generation |
| C151-2 (VNM-) - C152-1 (E1) | B - W-B | DC motor signal (turbocharger nozzle vane control actuator) |
Idling | Pulse generation |
| C151-30 (VNVC) - C151-22 (VNE2) | W - L | Power source of nozzle vane position sensor (turbocharger nozzle vane control actuator) |
Engine switch on (IG) | 4.5 to 5.5 V |
| C151-23 (VNA) - C151-22 (VNE2) | R - L | Nozzle vane position sensor signal (turbocharger nozzle vane control actuator) |
Engine switch on (IG) | 2.3 to 2.7 V |
| C151-29 (VCVL) - C151-20 (EVLU) | LG - W | Power source of throttle position sensor | Engine switch on (IG) | 4.5 to 5.5 V |
| C151-21 (VLU) - C151-20 (EVLU) | R - W | Throttle position sensor signal | Engine switch on (IG), throttle valve fully opened | 3.6 to 4.2 V |
| Engine switch on (IG), throttle valve fully closed | 0.4 to 1.0 V | |||
| C152-6 (M+) - C152-3 (ME01) | R - W-B | Diesel throttle duty signal | Engine warmed up, racing engine | Pulse generation |
| C152-5 (M-) - C152-3 (ME01) | L - W-B | Diesel throttle duty signal | Engine warmed up, racing engine | Pulse generation |
| C151-31 (VCEG) - C151-24 (EEGL) | V - G | Power source of EGR valve position sensor | Engine switch on (IG) | 4.5 to 5.5 V |
| C151-25 (EGLS) - C151-24 (EEGL) | R-Y - G | EGR valve position sensor | Engine switch on (IG) | 0.6 to 1.4 V |
| C151-6 (EGM+) - C152-1 (E1) | LG- W-B | EGR valve duty signal | Engine warmed up, idling | Pulse generation |
| C151-7 (EGM-) - C152-1 (E1) | V - W-B | EGR valve duty signal | Engine warmed up, idling | Pulse generation |
| C149-16 (ECBV) - C152-1 (E1) | L-Y - W-B | No. 1 vacuum switching valve assembly (for EGR bypass valve) | No. 1 vacuum switching valve assembly (for EGR bypass valve) on | 0 to 1.5 V |
| No. 1 vacuum switching valve assembly (for EGR bypass valve) off | 11 to 14 V | |||
| C151-32 (VCPX) - C151-26 (EPEX) | L - G | Power source of differential pressure sensor | Engine switch on (IG) | 4.5 to 5.5 V |
| C151-27 (PEX) - C151-26 (EPEX) | L - G | Differential pressure sensor | Engine switch on (IG) | 0.4 to 4.8 V |
| G184-5 (HA1A) - C152-2 (E04) | W - W-B | Air fuel ratio sensor heater | Engine switch on (IG) | 11 to 14 V |
| Idling before air fuel ratio sensor warmed | Pulse generation (See waveform 8) |
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| C152-31 (A1A+) - C152-1 (E1) | P - W-B | Air fuel ratio sensor | Engine switch on (IG) | 2.0 to 2.5 V |
| C152-32 (A1A-) - C152-1 (E1) | L - W-B | Air fuel ratio sensor | Engine switch on (IG) | 2.0 to 2.5 V |
| G184-6 (FIV) - C152-1 (E1) | W - W-B | Exhaust fuel addition injector | Exhaust fuel addition injector operating | Pulse generation |
| C149-23 (THTO) - C149-22 (ETTO) | R-W - G-B | Exhaust gas temperature sensor | Engine warmed up, idling | 0.2 to 4.95 V |
| C149-25 (THCI) - C149-24 (ETCI) | G-B - G-R | No. 2 Exhaust gas temperature sensor | Engine warmed up, idling | 0.2 to 4.95 V |
| C149-33 (THCO) - C149-26 (ETCO) | B - R | No. 3 Exhaust gas temperature sensor | Engine warmed up, idling | 0.2 to 4.95 V |
| C149-10 (SCV) - C151-45 (E01) | G - W-B | Vacuum switching valve assembly (for swirl control valve) | Idling | 0 to 1.5 V |
| Engine speed 2600 rpm or more | 11 to 14 V | |||
| C150-12 (ACM) - C151-45 (E01) | LG-B - W-B | Vacuum switching valve sub-assembly (for engine mounting) | Idling | 0 to 1.5 V |
| Engine speed 2600 rpm or more | 11 to 14 V | |||
| G184-11 (NSW)*1 - C152-1 (E1) | B - W-B | Park/neutral position switch assembly | Engine switch on (IG), shift lever in P or N | Below 3 V |
| Engine switch on (IG), shift lever not in P and N | 11 to 14 V | |||
| G184-28 (CANL) - C152-1 (E1) | W - W-B | CAN communication line | Engine switch on (IG) | Pulse generation (See waveform 9) |
| G184-17 (CANH) - C152-1 (E1) | R*2 - W-B LG*3 - W-B |
CAN communication line | Engine switch on (IG) | Pulse generation (See waveform 10) |
| G184-27 (CANU) - C152-1 (E1) | L - W-B | CAN communication line | Engine switch on (IG) | Pulse generation (See waveform 9) |
| G184-35 (CAND) - C152-1 (E1) | W - W-B | CAN communication line | Engine switch on (IG) | Pulse generation (See waveform 10) |
| C152-7 (LIN) - C152-1 (E1) | L - W-B | LIN communication line | Engine switch on (IG) | Pulse generation (See waveform 11) |
| C151-3 (E01) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| C152-4 (E02) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| C152-1 (E1) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| C152-3 (ME01) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| G185-8 (EC) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| C149-3 (E1D1) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| C150-5 (E1D2) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| C152-2 (E04) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
Tech Tips
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*1: for Automatic Transmission
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*2: for LHD
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*3: for RHD
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WAVEFORM 1
Mass Air Flow Meter Sub-assembly Signal Item Content ECM Terminal Name Between VG and EVG Tester Range 1 V/DIV., 100 μsec./DIV. Condition Engine switch on (IG) -
WAVEFORM 2
*a 10 V/DIV. *b 1 msec./DIV. No. 1 (to No. 4) Injector Assembly Signal Item Content ECM Terminal Name Between #1D+ and #1D-
Between #2D+ and #2D-
Between #3D+ and #3D-
Between #4D+ and #4D-
Tester Range 10 V/DIV., 1 msec./DIV. Condition Idling after engine warmed Tech Tips
The waveform varies depending on the injector injection.
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WAVEFORM 3
*a 5 V/DIV. *b 20 msec./DIV. Camshaft Position Sensor Signal Item Content ECM Terminal Name Between G2+ and G2- Tester Range 2 V/DIV., 20 msec./DIV. Condition Idling after engine warmed -
WAVEFORM 4
*a 2 V/DIV. *b 10 msec./DIV. Crankshaft Position Sensor Signal Item Content ECM Terminal Name Between NE+ and NE- Tester Range 2 V/DIV., 10 msec./DIV. Condition Idling after engine warmed -
WAVEFORM 5
*a 5 V/DIV. *b 10 msec./DIV. Vehicle Speed Signal Item Content ECM Terminal Name Between SPD and E1 Tool Setting 5 V/DIV., 10 msec./DIV. Condition Driving at vehicle speed of 40 km/h (25 mph) Tech Tips
The waveform varies depending on the engine speed.
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WAVEFORM 6
*a 5 V/DIV. *b 10 ms./DIV. Engine Speed Signal Item Content ECM Terminal Name Between TACH and E1 Tester Range 5 V/DIV., 10 msec./DIV. Condition Idling after engine warmed -
WAVEFORM 7
*1 10 V/DIV. *2 20 msec./DIV. Pre-stroke Control Valve Signal Item Content ECM Terminal Name Between PCV+ and PCV- Tester Range 10 V/DIV., 20 msec./DIV. Condition Idling after engine warmed -
WAVEFORM 8
*a 1 V/DIV. *b 2 ms./DIV. Engine Speed Signal Item Content ECM Terminal Name Between NEO and E1 Tester Range 1 V/DIV., 2 msec./DIV. Condition Racing with warm engine -
WAVEFORM 9
*a 1 V/DIV. *b 10 msec./DIV. CAN Communication Signal Item Content ECM Terminal Name Between CANL and E1
Between CAND and E1
Tester Range 1 V/DIV., 10 msec./DIV. Condition Engine stopped, Engine switch on (IG) -
WAVEFORM 10
*a 1 V/DIV. *b 10 msec./DIV. CAN Communication Signal Item Content ECM Terminal Name Between CANH and E1
Between CANU and E1
Tester Range 1 V/DIV., 10 msec./DIV. Condition Engine stopped, Engine switch on (IG) Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 11
*a 2 V/DIV. *b 10 msec./DIV. LIN Communication Signal Item Content ECM Terminal Name Between LIN and E1 Tester Range 2 V/DIV., 10 msec./DIV. Condition Engine stopped, Engine switch on (IG)