ECD SYSTEM (w/o EGR Cooler) 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 "Symbols (Terminal No.)" 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.
| Symbols (Terminal No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| BATT (E6-2) - E1 (E7-7) | L - BR | Battery (for measuring the battery voltage and for the ECM memory) | Always | 11 to 14 V |
| IGSW (E5-9) - E1 (E7-7) | B-O - BR | Ignition switch | Ignition switch ON | 11 to 14 V |
| +B (E5-1) - E1 (E7-7) | B - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| MREL (E5-8) - E1 (E7-7) | W-G - BR | MAIN relay | Ignition switch ON | 11 to 14 V |
| 10 seconds elapsed after ignition switch OFF | 0 to 1.5 V | |||
| VC (E8-18) - E2 (E8-28) | R-W - BR | Power source of sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| VCS (E7-2) - E2S (E7-1) | L-W - P-L | Power source of fuel pressure sensor (sub) | Ignition switch ON | 4.5 to 5.5 V |
| VPA (E5-22) - EPA (E5-28) | W-L - BR-W | 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 | |||
| VPA2 (E5-23) - EPA2 (E5-29) | GR-G - BR-Y | 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 | |||
| VCPA (E5-26) - EPA (E5-28) | LG-R - BR-W | Power source of accelerator pedal position sensor (for VPA) | Ignition switch ON | 4.5 to 5.0 V |
| VCP2 (E5-27) - EPA2 (E5-29) | BR-R - BR-Y | Power source of accelerator pedal position sensor (for VPA2) | Ignition switch ON | 4.5 to 5.0 V |
| VG (E7-24) - EVG (E7-32) | W-R - B-W | MAF meter | Idling, A/C switch OFF | 0.5 to 3.4 V |
| THA (E8-31) - E2 (E8-28) | Y-B - BR | IAT sensor (built into MAF meter) | Idling, intake air temperature at 20°C (68°F) | 0.5 to 3.4 V |
| THIA (E8-20) - E2 (E8-28) | Y-G - BR | Intake air temperature sensor | Atmospheric air temperature | 0.5 to 3.4 V |
| THW (E8-19) - E2 (E8-28) | R-L - BR | ECT sensor | Idling, engine coolant temperature at 80°C (176°F) | 0.2 to 1.0 V |
| STA (E5-7) - E1 (E7-7) | B-Y*1 - BR L-Y*2 - BR |
Starter signal | Cranking | 6.0 V or more |
| #1 (E8-24) - E1 (E7-7) #2 (E8-23) - E1 (E7-7) #3 (E8-22) - E1 (E7-7) #4 (E8-21) - E1 (E7-7) |
B-W - BR R - BR V - BR Y-R - BR |
Injector | Idling | Pulse generation (see waveform 1) |
| NE+ (E8-27) - NE- (E8-34) | Y - L | Crankshaft position sensor | Idling | Pulse generation (see waveform 2) |
| G+ (E7-23) - G- (E7-31) | Y - L | Camshaft position sensor | Idling | Pulse generation (see waveform 2) |
| STP (E6-15) - E1 (E7-7) | G-W - BR | Stop light switch | Ignition switch ON, brake pedal depressed | 7.5 to 14 V |
| Ignition switch ON, brake pedal released | 0 to 1.5 V | |||
| ST1- (E6-14) - E1 (E7-7) | R-L - BR | Stop light switch (opposite to STP) |
Ignition switch ON, brake pedal depressed | 0 to 1.5 V |
| Ignition switch ON, brake pedal released | 7.5 to 14 V | |||
| TC (E5-11) - E1 (E7-7) | P-B - BR | Terminal TC of DLC3 | Ignition switch ON | 11 to 14 V |
| W (E5-12) - E1 (E7-7) | R-B - BR | MIL | MIL illuminated | 0 to 3 V |
| MIL not illuminated | 11 to 14 V | |||
| SPD (E6-17) - E1 (E7-7) | V-R - BR | Speed signal from combination meter | Ignition switch ON, slowly rotate wheel | Pulse generation (see waveform 3) |
| PIM (E7-28) - E2 (E8-28) | L-B - BR | Manifold absolute pressure sensor | Apply negative pressure of 40 kPa (300 mmHg, 11.8 in.Hg) | 0.1 to 0.7 V |
| Same as atmospheric pressure | 0.8 to 1.5 V | |||
| Apply positive pressure of 170 kPa (1,275 mmHg, 50.2 in.Hg) | 1.6 to 2.3 V | |||
| IREL (E5-10) - E1 (E7-7) | B-W - BR | EDU relay | Ignition switch ON | 0 to 1.5 V |
| TACH (E5-4) - E1 (E7-7) | B-W - BR | Engine speed | Idling | Pulse generation (see waveform 4) |
| PCR1 (E8-26) - E2 (E8-28) | R-Y - BR | Common rail pressure sensor (main) | Idling | 1.7 to 2.2 V |
| PCR2 (E8-33) - E2 (E8-28) | G-R - BR | Common rail pressure sensor (sub) | Idling | 1.2 to 1.6 V |
| GREL (E5-15) - E1 (E7-7) | R - BR | GLOW relay | Cranking | 11 to 14 V |
| THF (E8-29) - E2 (E8-28) | G-B - BR | Fuel temperature sensor | Ignition switch ON | 0.5 to 3.4 V |
| ALT (E8-8) - E1 (E7-7) | G - BR | Generator duty ratio | Idling | Pulse generation (see waveform 5) |
| PCV+ (E8-2) - PCV- (E8-1) | G-W - G-Y | Suction control valve | Idling | Pulse generation (see waveform 6) |
| INJF (E8-25) - E1 (E7-7) | P - BR | EDU | Idling | Pulse generation (see waveform 7) |
| VNTO (E8-10) - E1 (E7-7) | B-O - BR | Turbo motor driver | Idling | Pulse generation (see waveform 8) |
| VNTI (E8-17) - E1 (E7-7) | R-B - BR | Turbo motor driver | Idling | Pulse generation (see waveform 9) |
| PRD (E8-32) - E1 (E7-7) | GR - BR | EDU | Ignition switch OFF | 4 to 6.5 V |
| VLU (E7-29) - E2 (E8-28) | B - BR | Throttle position sensor | Ignition switch ON, throttle valve fully opened |
3.6 to 4.2 V |
| Ignition switch ON, throttle valve fully closed |
0.4 to 1.0 V | |||
| LUSL (E7-4) - E1 (E7-7) | GR - BR | Diesel throttle motor duty signal | Engine warmed up, racing engine | Pulse generation (see waveform 10) |
| SCV (E8-15) - E01 (E8-7) | LG - W-B | VSV for swirl control valve | Idling | 0 to 1.5 V |
| Engine speed 2600 rpm or more | 11 to 14 V | |||
| EGR (E7-9) - E1 (E7-7) | L-R - BR | E-VRV (for E-EGR) | Ignition switch ON | Pulse generation (see waveform 11) |
| EGRC (E7-18) - E1 (E7-7) | Y-B - BR | VSV (for EGR Cut) | Ignition switch ON, EGR cuts (accelerator pedal fully depressed) | 0 to 1.5 V |
| CAN+ (E6-22)*1 - E1 (E7-7) | V - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 12) |
| CAN- (E6-21)*1 - E1 (E7-7) | P - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 13) |
Tech Tips
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*1: A/T
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*2: M/T
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WAVEFORM 1
Injector No. 1 (to No. 4) injection signal ECM Terminal Name (a) Between #1 and E1
(b) Between #3 and E1
(c) Between #4 and E1
(d) Between #2 and E1
Tester Range 5 V/DIV., 20 msec./DIV. Condition Idling with warm engine Tech Tips
The waveform varies depending on the injector injection.
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WAVEFORM 2
Crankshaft position sensor signal and Camshaft position sensor signal ECM Terminal Name (a) Between NE+ and NE-
(b) Between G+ and G-
Tester Range 5 V/DIV., 20 msec./DIV. Condition Idling with warm engine Tech Tips
The waveform varies depending on the engine speed.
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WAVEFORM 3
Vehicle speed signal ECM Terminal Name Between SPD and E1 Tester Range 5 V/DIV., 10 msec./DIV. Condition Driving at vehicle speed of 40 km/h (25 mph) Tech Tips
The wavelength becomes shorter as the vehicle speed increases.
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WAVEFORM 4
Engine speed signal ECM Terminal Names Between TACH and E1 Tester Ranges 5 V/DIV., 10 msec./DIV. Conditions Idling Tech Tips
The wavelength becomes shorter as the engine rpm increases.
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WAVEFORM 5
Generator duty ratio signal ECM Terminal Names Between ALT and E1 Tester Ranges 5 V/DIV., 2 msec./DIV. Conditions Idling Tech Tips
The wavelength becomes shorter as the engine rpm increases.
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WAVEFORM 6
Suction control valve signal ECM Terminal Name Between PCV+ and PCV- Tester Range 10 V/DIV., 5 msec./DIV. Condition Idling or cranking with warm engine Tech Tips
The waveform varies depending on the suction control valve operation.
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WAVEFORM 7
Injector injection confirmation signal ECM Terminal Name Between INJF and E1 Tester Range 2 V/DIV., 20 msec./DIV. Condition Idling with warm engine Tech Tips
The waveform varies depending on the injector injection.
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WAVEFORM 8
Turbo motor driver input signal ECM Terminal Name Between VNTO and E1 Tester Range 5 V/DIV., 20 msec./DIV. Condition Idling with warm engine Tech Tips
The waveform varies depending on the turbocharger operation.
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WAVEFORM 9
Turbo motor driver output signal ECM Terminal Name Between VNTI and E1 Tester Range 5 V/DIV., 50 msec./DIV. Condition Idling with warm engine Tech Tips
The waveform varies depending on the turbocharger status.
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WAVEFORM 10
Diesel throttle motor signal ECM Terminal Name Between LUSL and E1 Tester Range 1 V/DIV., 2 msec./DIV. Condition Warm engine with racing engine Tech Tips
The waveform varies depending on the throttle valve operation.
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WAVEFORM 11
E-VRV (for E-EGR) signal ECM Terminal Name Between EGR and E1 Tester Range 5 V/DIV., 1 msec./DIV. Condition Idling with warm engine Tech Tips
The waveform varies depending on the E-VRV (for E-EGR) operation.
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WAVEFORM 12
CAN communication signal ECM Terminal Name Between CAN+ and E1 Tester Range 1 V/DIV., 10 msec./DIV. Condition Engine is stopped, ignition switch ON Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 13
CAN communication signal ECM Terminal Name Between CAN- and E1 Tester Range 1 V/DIV., 10 msec./DIV. Condition Engine is stopped, ignition switch ON Tech Tips
The waveform varies depending on the CAN communication signal.