ECD SYSTEM TERMINALS OF ECM
Tech Tips
The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated.
The result of the checks should be compared with the standard normal voltage for that pair of terminals, which is displayed in the Specified Condition column.
The illustration above can be used as a reference to identify the ECM terminal locations.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A59-1 (+B) - A59-2 (E1) | B - W-B | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A59-61 (+B2) - A59-2 (E1) | B - W-B | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A59-23 (BATT) - A59-2 (E1) | V - W-B | Battery (for measuring the battery voltage and for the ECM memory) | Always | 11 to 14 V |
| A59-7 (IGSW) - A59-2 (E1) | R - W-B | Ignition switch | Ignition switch ON | 11 to 14 V |
| A59-22 (MREL) - A59-2 (E1) | GR - W-B | ECD relay | Ignition switch ON | 11 to 14 V |
| 15 seconds elapsed after ignition switch off | 0 to 1.5 V | |||
| B21-13 (GREL) - A59-2 (E1) | W - W-B | GLOW relay | Ignition switch ON at cold engine | 0 to 1.5 V |
| Idling with warm engine | 11 to 14 V | |||
| A59-55 (VPA) - A59-57 (EPA) | R - R | Accelerator pedal position sensor (for engine control) | Ignition switch ON Accelerator pedal fully released |
0.6 to 1.0 V |
| Ignition switch ON Accelerator pedal fully depressed |
3.0 to 4.6 V | |||
| A59-52 (VPA2) - A59-54 (EPA2) | L - B | Accelerator pedal position sensor (for sensor malfunction detection) | Ignition switch ON Accelerator pedal fully released |
1.4 to 1.8 V |
| Ignition switch ON Accelerator pedal fully depressed |
3.7 to 5.0 V | |||
| A59-56 (VCPA) - A59-57 (EPA) | B - R | Power source of accelerator pedal position sensor (for VPA) | Ignition switch ON | 4.5 to 5.0 V |
| A59-53 (VCP2) - A59-54 (EPA2) | W - B | Power source of accelerator pedal position sensor (for VPA2) | Ignition switch ON | 4.5 to 5.0 V |
| A59-46 (VCTA) - A59-47 (ETA) | W - R | Power source of diesel throttle position sensor | Ignition switch ON | 4.5 to 5.0 V |
| A59-45 (VTA1) - A59-47 (ETA) | B - R | Diesel throttle position sensor | Throttle valve fully opened | 3.2 to 4.9 V |
| Throttle valve fully closed | 0.5 to 1.1 V | |||
| A59-43 (M+) - A59-2 (E1) | B - W-B | Diesel throttle duty signal | Engine racing | Pulse generation |
| A59-42 (M-) - A59-2 (E1) | W - W-B | Diesel throttle duty signal | Engine racing | Pulse generation |
| A59-63 (H-) - A59-2 (E1) | G - W-B | Air fuel ratio sensor heater | Ignition switch ON | 11 to 14 V |
| Idling with warm engine | Pulse generation (See waveform 1) |
|||
| A59-69 (AF1+) - A59-2 (E1) | W - W-B | Air fuel ratio sensor signal | Ignition switch ON | 1.5 to 4.9 V |
| A59-70 (AF1-) - A59-2 (E1) | BR - W-B | Air fuel ratio sensor signal | Ignition switch ON | 2.35 to 2.65 V |
| A59-68 (TR) - A59-2 (E1) | B - W-B | Air fuel ratio sensor signal | Ignition switch ON | 1.5 to 4.9 V |
| A59-71 (RE) - A59-2 (E1) | Y - W-B | Air fuel ratio sensor signal | Ignition switch ON | 2.1 to 3.5 V |
| B21-29 (THF) - B21-28 (ETHF) | W - R | Fuel temperature sensor | Idling | 0.5 to 2.0 V |
| B21-15 (VCS) - B21-14 (E2S) | BR - B | Power source of fuel pressure sensor | Ignition switch ON | 4.5 to 5.0 V |
| B21-16 (PC) - B21-14 (E2S) | R - B | Common rail pressure sensor | Idling | 1.0 to 1.3 V |
| A59-11 (VG) - A59-12 (EVG) | GR - V | Mass air flow meter | Idling | Pulse generation |
| A59-30 (THA) - A59-31 (ETHA) | W - R | Intake air temperature sensor | Idling, intake air temperature at 20°C (68°F) | 0.5 to 2.0 V |
| B21-4 (PRV) - A59-2 (E1) | Y - W-B | Pressure control valve signal | Drive vehicle at 50 km/h (31 mph) with third gear, and then decelerate by releasing accelerator pedal | Pulse generation (See waveform 2) |
| B21-12 (PCV) - A59-2 (E1) | L - W-B | Supply pump (Suction control valve) |
Idling | Pulse generation (See waveform 3) |
| B21-1 (IJ1+) - B21-21 (IJ1-) | B - W | Injector | Idling | Pulse generation |
| B21-2 (IJ2+) - B21-30 (IJ2-) | R - W | Injector | Idling | Pulse generation |
| B21-3 (IJ3+) - B21-31 (IJ3-) | L - Y | Injector | Idling | Pulse generation |
| B21-20 (IJ4+) - B21-32 (IJ4-) | G - B | Injector | Idling | Pulse generation |
| A59-50 (THCI) - A59-51 (ETCI) | BR - P | Exhaust gas temperature sensor B1S1 | Idling with warm engine | 2.9 to 3.3 V |
| A59-48 (THCO) - A59-49 (ETCO) | L - Y | Exhaust gas temperature sensor B1S1 | Idling with warm engine | 2.9 to 3.3 V |
| B21-40 (THW) - B21-39 (ETHW) | L - BR | Engine coolant temperature sensor | Idling, engine coolant temperature at 80°C (176°F) | 0.2 to 1.0 V |
| B21-8 (THIA) - B21-7 (ETHI) | B - W | Intake air temperature sensor (intake manifold) | Idling, intake air temperature at 0 to 80°C (32 to 176°F) | 0.5 to 2.0 V |
| A59-14 (VPIM) - A59-15 (EPIM) | R - Y | Power source of turbo pressure sensor | Ignition switch ON | 4.5 to 5.0 V |
| A59-13 (PIM) - A59-15 (EPIM) | G - Y | Turbo pressure sensor | Ignition switch ON (same as atmosphere pressure) |
0.8 to 1.4 V |
| B21-19 (NE+) - B21-18 (NE-) | L - P | Crankshaft position sensor | Idling | Pulse generation (See waveform 4) |
| B21-11 (G+) - B21-10 (G-) | G - R | Camshaft position sensor | Idling | Pulse generation (See waveform 4) |
| B21-37 (VNVC) - B21-36 (VNE2) | G - L | Power source of nozzle vane position sensor | Ignition switch ON | 4.5 to 5.0 V |
| B21-38 (VTA1) - B21-36 (VNE2) | R - L | Nozzle vane position sensor | VN turbocharger fully closed | 0.9 to 2.1 V |
| VN turbocharger fully opened | 3.0 to 4.1 V | |||
| B21-34 (M+) - A59-2 (E1) | BR - W-B | VN turbocharger motor | Idling with warm engine | Pulse generation |
| B21-33 (M-) - A59-2 (E1) | Y - W-B | VN turbocharger motor | Idling with warm engine | Pulse generation |
| A59-40 (ECBV) - A59-2 (E1) | W - W-B | VSV for EGR cooler bypass valve | Ignition switch ON at cold engine | 0 to 1.5 V |
| Idling with warm engine | 11 to 14 V | |||
| B21-26 (VCEG) - B21-25 (EEGL) | Y - L | Power source of EGR valve position sensor | Ignition switch ON | 4.5 to 5.0 V |
| B21-23 (EGM+) - A59-2 (E1) | B - W-B | EGR valve motor | Idling with warm engine | Pulse generation |
| B21-22 (EGM-) - A59-2 (E1) | W - W-B | EGR valve motor | Idling with warm engine | Pulse generation |
| B21-27 (EGLS) - B21-25 (EEGL) | P - L | EGR valve position sensor | EGR valve fully closed | 0.8 to 1.6 V |
| EGR valve fully opened | 3.6 to 4.4 V | |||
| A59-33 (VCPX) - A59-34 (EPEX) | B - W | Power source of differential pressure sensor | Ignition switch ON | 4.5 to 5.0 V |
| A59-32 (PEX) - A59-34 (EPEX) | R - W | Differential pressure sensor | Ignition switch ON | 0.5 to 1.0 V |
| A59-5 (D) - A59-2 (E1) | B - W-B | Clutch switch (upper) |
Ignition switch ON Clutch pedal released |
11 to 14 V |
| Ignition switch ON Clutch pedal depressed |
0 to 1.5 V | |||
| A59-8 (OILH) - A59-2 (E1) | V - W-B | Engine oil level upper switch | Oil level upper switch off | 4.5 to 5.0 V |
| Oil level upper switch ON | 0 to 1.5 V | |||
| A59-6 (STA) - A59-2 (E1) | BR - W-B | Starter signal | Cranking | 6.0 V or more |
| A59-80 (TACH) - A59-2 (E1) | LG - W-B | Engine speed | Idling | Pulse generation |
| A59-29 (STP) - A59-2 (E1) | LG - W-B | Stop light switch | Brake pedal depressed | 7.5 to 14 V |
| Brake pedal released | 0 to 1.5 V | |||
| A59-28 (ST1-) - A59-2 (E1) | B - W-B | Stop light switch (opposite to STP) |
Brake pedal depressed | 0 to 1.5 V |
| Brake pedal released | 7.5 to 14 V | |||
| A59-25 (SPD) - A59-2 (E1) | V - W-B | Speed signal from combination meter | Ignition switch ON driving wheel rotating slowly | Pulse generation (See waveform 5) |
| A59-37 (W) - A59-2 (E1) | B - W-B | MIL | MIL illuminated | 0 to 3 V |
| MIL not illuminated | 11 to 14 V | |||
| A59-24 (TC) - A59-2 (E1) | L - W-B | Terminal TC of DLC3 | Ignition switch ON | 11 to 14 V |
| A59-20 (FANL) - A59-2 (E1) | R - W-B | Fan No. 1 relay | Ignition switch ON | 11 to 14 V |
| Idling with warm engine | 0 to 1.5 V | |||
| A59-21 (FANH) - A59-2 (E1) | G - W-B | Fan No. 2 relay | Idling with high engine coolant temperature | 0 to 1.5 V |
| A59-10 (ELS) - A59-2 (E1) | G - W-B | Electric load | Tail light switch ON | 7.5 to 14 V |
| Tail light switch off | 0 to 1.5 V | |||
| A59-27 (ELS2) - A59-2 (E1) | SB - W-B | Electric load | Defogger switch ON | 7.5 to 14 V |
| Defogger switch off | 0 to 1.5 V | |||
| A59-26 (MHSW) - A59-2 (E1)*1 | W - W-B | Power heater switch signal | Power heater switch ON | 11 to 14 V |
| A59-9 (R) - A59-2 (E1) | R - W-B | Back-up light switch signal | Back-up light switch on | 11 to 14 V |
| A59-3 (CANH) - A59-2 (E1) | L - W-B | CAN communication line | Ignition switch ON | Pulse generation (See waveform 6) |
| A59-4 (CANL) - A59-2 (E1) | W - W-B | CAN communication line | Ignition switch ON | Pulse generation (See waveform 7) |
| A59-17 (CANP) - A59-2 (E1) | B - W-B | CAN communication line | Ignition switch ON | Pulse generation (See waveform 6) |
| A59-16 (CANN) - A59-2 (E1) | W - W-B | CAN communication line | Ignition switch ON | Pulse generation (See waveform 7) |
| A59-73 (POP) - A59-75 (E2) | BR - L | Oil pressure sender gauge assembly | Engine running | 0.5 to 4.5 V |
| A59-74 (VC) - A59-75 (E2) | R - L | Power source of oil pressure sender gauge assembly | Ignition switch ON | 4.5 to 5.5 V |
| B21-5 (V2O) - A59-2 (E1) | R - W-B | Oil pressure switching valve assembly | Oil pressure switching valve ON | 0 to 1.5 V |
| Oil pressure switching valve OFF | 11 to 14 V |
-
*1: w/ Power Heater (Combustion Type)
-
Waveform 1
*a 5 V/DIV *b 2 ms/DIV Air Fuel Ratio Sensor Heater ECM Terminal Name H- - E1 Tester Range 5 V/DIV, 2 ms/DIV Condition Idling with warm engine Tech Tips
The wavelength varies depending on the engine operating condition.
-
Waveform 2
*1 10 V/DIV *2 0.5 ms/DIV Pressure Control Valve Signal ECM Terminal Name PRV - E1 Tester Range 10 V/DIV, 0.5 ms/DIV Condition Drive vehicle at 50 km/h (31 mph) with third gear, and then decelerate by releasing accelerator pedal Tech Tips
The waveform varies depending on the pressure control valve operation.
-
Waveform 3
*a 10 V/DIV *b 5 ms/DIV Suction control valve Signal ECM Terminal Name PCV - E1 Tester Range 10 V/DIV, 5 ms/DIV Condition Idling or cranking with warm engine Tech Tips
The waveform varies depending on the suction control valve operation.
-
Waveform 4
*a 5 V/DIV *b 10 ms/DIV Crankshaft Position Sensor and Camshaft Position Sensor Signal ECM Terminal Name NE+ - NE-
G+ - G-
Tester Range 5 V/DIV, 10 ms/DIV Condition Idling Tech Tips
The waveform varies depending on the engine speed.
-
Waveform 5
*a 1 V/DIV *b 10 ms/DIV Vehicle Speed Signal ECM Terminal Name SPD - E1 Tester Range 1 V/DIV, 10 ms/DIV Condition While driving vehicle Tech Tips
The wavelength becomes shorter as the vehicle speed increases.
-
Waveform 6
*a 1 V/DIV *b 10 μs/DIV CAN Communication Signal (Reference) ECM Terminal Name CANH - E1
CAN+ - E1
Tester Range 1 V/DIV, 10 μs/DIV Condition Engine stopped, ignition switch ON Tech Tips
The wavelength varies depending on the CAN communication signal.
-
Waveform 7
*a 1 V/DIV *b 10 μs/DIV CAN Communication Signal (Reference) ECM Terminal Name CANL - E1
CAN- - E1
Tester Range 1 V/DIV, 10 μs/DIV Condition Engine stopped, ignition switch ON Tech Tips
The wavelength varies depending on the CAN communication signal.