ECD SYSTEM TERMINALS OF ECM
Tech Tips
Each ECM terminal's standard normal voltage is shown in the table below.
In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the terminals to be inspected. The standard normal voltage between the terminals is shown under "Specified Condition". Use the illustration above as a reference for the ECM terminals.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| BATT (E20-1) - E1 (E23-14) | L - BR | Battery (for measuring the battery voltage and for ECM memory) | Always | 9 to 14 V |
| SREL (E20-2) - E01 (E23-13) | R - W-B | GLOW relay | Cranking | 9 to 14 V |
| SREL (E20-2) - E01 (E23-13) | R - W-B | GLOW relay | Idling (engine start and after 600 sec.) |
0 to 1.5 V |
| MREL (E20-3) - E1 (E23-14) | W-G - BR | MAIN relay | Ignition switch ON | 9 to 14 V |
| MREL (E20-3) - E1 (E23-14) | W-G - BR | MAIN relay | Ignition switch OFF (after ignition switch OFF for 2 sec.) |
0 to 1.5 V |
| TC (E20-4) - E1 (E23-14) | P-B - BR | Terminal TC of DLC3 | Ignition switch ON | 9 to 14 V |
| W (E20-5) - E1 (E23-14) | R-B - BR | MIL | MIL lights up | 0 to 3 V |
| W (E20-5) - E1 (E23-14) | R-B - BR | MIL | MIL does not light up | 9 to 14 V |
| THWO (E20-8) - E1 (E23-14) | P - BR | Combination meter | Ignition switch ON | Pulse generation (See waveform 1) |
| SP1 (E20-9) - E1 (E23-14) | V-R - BR | Speed signal from combination meter | Ignition switch ON, rotate driving wheel slowly | Pulse generation (See waveform 2) |
| STA (E20-11) - E1 (E23-14) | L-Y - BR | Starter signal | Cranking | 6 V or more |
| +B (E20-12) - E1 (E23-14) | B - BR | Power source of ECM | Ignition switch ON | 9 to 14 V |
| IGSW (E20-14) - E1 (E23-14) | B-O - BR | Ignition switch | Ignition switch ON | 9 to 14 V |
| SIL (E20-15) - E1 (E23-14) | R-Y - BR | Terminal SIL of DLC3 | Connect intelligent tester to DLC3 | Pulse generation |
| STP (E20-19) - E1 (E23-14) | G-W - BR | Stop light switch | Brake pedal depressed | 9 to 14 V |
| STP (E20-19) - E1 (E23-14) | G-W - BR | Stop light switch | Brake pedal released | Below 1.5 V |
| GIND (E21-1) - E1 (E23-14) | Y-R - BR | Glow indicator light | Glow indicator light lights up | 0 to 3 V |
| GIND (E21-1) - E1 (E23-14) | Y-R - BR | Glow indicator light | Glow indicator light does not light up | 9 to 14 V |
| AC1 (E21-2) - E1 (E23-14) | Y - BR | A/C amplifier | A/C switch ON (magnetic clutch ON) |
Below 1.5 V |
| AC1 (E21-2) - E1 (E23-14) | Y - BR | A/C amplifier | A/C switch OFF | 7.5 to 14 V |
| VPA (E21-5) - EPA (E21-4) | W-L - BR-W | Accelerator pedal position sensor (for engine control) |
Ignition switch ON, accelerator pedal released | 0.5 to 1.1 V |
| VPA (E21-5) - EPA (E21-4) | W-L - BR-W | Accelerator pedal position sensor (for engine control) |
Ignition switch ON, accelerator pedal depressed | 2.6 to 4.5 V |
| VCPA (E21-6) - EPA (E21-4) | LG-R - BR-W | Power source of accelerator pedal position sensor (for VPA) |
Ignition switch ON | 4.5 to 5.5 V |
| TACH (E21-7) - E1 (E23-14) | B-W - BR | Engine speed | Idling | Pulse generation (See waveform 3) |
| ACT (E21-8) - E1 (E23-14) | R-L - BR | A/C amplifier | Ignition switch ON | 9 to 14 V |
| ACT (E21-8) - E1 (E23-14) | R-L - BR | A/C amplifier | A/C cut controlled (driving below 30 km/h (18.6 mph), accelerator pedal fully depressed for 5 sec.) | 0 to 3 V |
| ST1- (E21-11) - E1 (E23-14) | R-L - BR | Stop light switch | Brake pedal depressed | Below 1.5 V |
| ST1- (E21-11) - E1 (E23-14) | R-L - BR | Stop light switch | Brake pedal released | 9 to 14 V |
| VPA2 (E21-12) - EPA (E21-4) | GR-G - BR-W | Accelerator pedal position sensor (for sensor malfunction detection) | Ignition switch ON, accelerator pedal released | 1.2 to 2.0 V |
| VPA2 (E21-12) - EPA (E21-4) | GR-G - BR-W | Accelerator pedal position sensor (for sensor malfunction detection) | Ignition switch ON, accelerator pedal depressed | 3.4 to 5.3 V |
| VC (E22-1) - E2 (E22-9) | R-W - BR | Power source of sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| PIM (E22-2) - E2 (E22-9) | L-B - BR | Manifold absolute pressure sensor | Apply vacuum 60 kPa (450 mmHg, 17.7 in.Hg) |
0.2 to 0.8 V |
| PIM (E22-2) - E2 (E22-9) | L-B - BR | Manifold absolute pressure sensor | Apply vacuum 207 kPa (1,550 mmHg, 61.0 in.Hg) |
4.2 to 4.8 V |
| THA (E22-3) - E2 (E22-9) | Y-G - BR | Intake air temperature sensor | Idling, air intake temp. 0°C (32°F) to 80°C (176°F) | 0.5 to 3.4 V |
| THW (E22-4) - E2 (E22-9) | R-L - BR | Engine coolant temperature sensor | Idling, engine coolant temp. 60°C (140°F) to 120°C (248°F) | 0.2 to 1.0 V |
| THF (E22-5) - E2 (E22-9) | G-B - BR | Fuel temperature sensor | Ignition switch ON (engine cold) | 0.5 to 3.4 V |
| DATA (E22-6) - E1 (E23-14) | Y - BR | Injection pump | For 0.5 sec. after ignition switch ON | Pulse generation |
| CLK (E22-14) - E1 (E23-14) | L - BR | Injection pump | For 0.5 sec. after ignition switch ON | Pulse generation |
| THOP (E22-15) - E1 (E23-14) | GR - BR | Throttle open switch | Idling (engine warmed up) | 9 to 14 V |
| THOP (E22-15) - E1 (E23-14) | GR - BR | Throttle open switch | Ignition switch ON (once within 5 sec.) | 0 to 3 V |
| LU-B (E23-7) - E01 (E23-13) | L-Y - W-B | Throttle control motor (Intake shutter) |
Racing (engine warmed up) | Pulse generation (See waveform 4) |
| LU+B (E23-8) - E01 (E23-13) | L-R - W-B | Throttle control motor (Intake shutter) |
Racing (engine warmed up) | Pulse generation (See waveform 4) |
| LU-A (E23-9) - E01 (E23-13) | L-W - W-B | Throttle control motor (Intake shutter) |
Racing (engine warmed up) | Pulse generation (See waveform 4) |
| LU+A (E23-10) - E01 (E23-13) | L-B - W-B | Throttle control motor (Intake shutter) |
Racing (engine warmed up) | Pulse generation (See waveform 4) |
| TCV (E23-11) - E01 (E23-13) | R-W - W-B | Timing control valve | Ignition switch ON | 9 to 14 V |
| TCV (E23-11) - E01 (E23-13) | R-W - W-B | Timing control valve | Idling | Pulse generation (See waveform 5) |
| SPV+ (E23-12) - E1 (E23-14) | R-L - BR | Spill control valve | Ignition switch ON | 9 to 14 V |
| SPV+ (E23-12) - E1 (E23-14) | R-L - BR | Spill control valve | Idling | Pulse generation |
| TDC+ (E23-17) - TDC- (E23-16) | R - G | Crankshaft position sensor | Idling | Pulse generation (See waveform 6) |
| NE+ (E23-19) - NE- (E23-18) | L - Y | Engine speed sensor | Idling | Pulse generation (See waveform 6) |
| SPV- (E23-25) - E1 (E23-14) | R-Y - BR | Spill control valve | Idling | Pulse generation (See waveform 7) |
-
Waveform 1 (Reference):
-
A/C amplifier signal.
Item Content Terminal No. THWO - E1 Tool Setting 5 V/DIV., 0.1 sec./DIV. Condition During idling Tech Tips
Waveform time A changes according to coolant temperature.
-
-
Waveform 2 (Reference):
-
Speed signal.
Item Content Terminal No. SPD - E1 Tool Setting 2 V/DIV., 20 msec./DIV. Condition When driving at approx. 20 km/h (12.4 mph). Tech Tips
-
As vehicle speed increases, the waveform becomes shorter.
-
As vehicle speed increases, the waveforms amplitude become greater.
-
-
-
Waveform 3 (Reference):
-
Engine speed signal.
Item Content Terminal No. TACH - E1 Tool Setting 5 V/DIV., 20 msec./DIV. Condition
-
After warming up
-
During idling
Tech Tips
As engine speed increases, the waveform becomes shorter.
-
-
-
Waveform 4 (Reference):
-
Throttle control motor signal.
Item Content Terminal No. LU+A, LU-A, LU+B, LU-B - E01 Tool Setting 10 V/DIV., 0.5 msec./DIV. Condition During engine racing
-
-
Waveform 5 (Reference):
-
Timing control value signal.
Item Content Terminal No. TCV - E01 Tool Setting 10 V/DIV., 10 msec./DIV. Condition During idling
-
-
Waveform 6 (Reference):
-
Crankshaft position sensor signal.
Item Content Terminal No. TDC+ - TDC-
NE+ - NE-
Tool Setting 2 V/DIV., 20 msec./DIV. Condition During idling
-
-
Waveform 7 (Reference):
-
Spill control valve signal.
Item Content Terminal No. SPV- - E1 Tool Setting 20 V/DIV., 10 msec./DIV. Condition During idling
-