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 |
|---|---|---|---|---|
| B88-2 (BATT) - D105-109 (E1) | W - BR | Battery (for measuring the battery voltage and for the ECM memory) | Always | 11 to 14 V |
| B88-25 (IGSW) - D105-109 (E1) | B - BR | Ignition switch | Ignition switch ON | 11 to 14 V |
| B88-1 (+B) - D105-109 (E1) | L - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| B88-28 (MREL) - D105-109 (E1) | G - BR | EFI MAIN relay | Ignition switch ON | 11 to 14 V |
| 10 seconds elapsed after ignition switch off | 0 to 1.5 V | |||
| B88-53 (VPA) - B88-54 (EPA) | L - G | 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 | 2.9 to 4.2 V | |||
| B88-56 (VPA2) - B88-57 (EPA2) | B - GR | 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 | |||
| B88-55 (VCPA) - B88-54 (EPA) | W - G | Power source of accelerator pedal position sensor (for VPA) | Ignition switch ON | 4.5 to 5.0 V |
| B88-58 (VCP2) - B88-57 (EPA2) | R - GR | Power source of accelerator pedal position sensor (for VPA2) | Ignition switch ON | 4.5 to 5.0 V |
| D105-110 (THA) - D105-87 (ETHB) | R - Y | IAT sensor | Idling, intake air temperature at 20°C (68°F) | 0.5 to 3.4 V |
| D105-111 (THW) - D105-88 (ETHW) | R-W - Y | ECT sensor | Idling, engine coolant temperature at 80°C (176°F) | 0.2 to 1.0 V |
| D105-113 (THIA) - D105-90 (ETHI) | R - Y | IAT sensor (Turbo) | Idling, intake air temperature at 0 to 80°C (32 to 176°F) | 0.5 to 3.4 V |
| D105-114 (RTHW) - D105-74 (E2) | L - Y | Engine coolant temperature (radiator) sensor | Idling, radiator side engine coolant temperature at 80°C (176°F) | 0.5 to 4.5 V |
| B88-36 (STA) - D105-109 (E1) | R - BR | Starter signal | Cranking | 6.0 V or more |
| D105-50 (#1) - D105-109 (E1) D105-49 (#2) - D105-109 (E1) D105-48 (#3) - D105-109 (E1) D105-47 (#4) - D105-109 (E1) |
G - BR GR - BR Y - BR B - BR |
Injector | Idling | Pulse generation (see waveform 1) |
| D105-103 (NE+) - D105-102 (NE-) | B - W | Crankshaft position sensor | Idling | Pulse generation (see waveform 2) |
| D105-80 (G+) - D105-79 (G-) | R - G | Camshaft position sensor | Idling | Pulse generation (see waveform 2) |
| B88-35 (STP) - D105-109 (E1) | Y - 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 | |||
| B88-34 (ST1-) - D105-109 (E1) | R - 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 | |||
| B88-26 (TC) - D105-109 (E1) | G - BR | Terminal TC of DLC3 | Ignition switch ON | 11 to 14 V |
| B88-14 (SPD) - D105-109 (E1) | P - BR | Speed signal from combination meter | Ignition switch ON, slowly rotate wheel | Pulse generation (see waveform 3) |
| D105-118 (EGLS) - D105-95 (EEGL) | P - Y | EGR valve position sensor | Ignition switch ON | 1.03 to 1.37 V |
| D105-94 (VCEG) - D105-95 (EEGL) | L - Y | Power source of EGR valve position sensor | Ignition switch ON | 4.5 to 5.5 V |
| D105-117 (PIM) - D105-116 (EPIM) | P - Y | 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 (1275 mmHg, 50.2 in.Hg) | 1.6 to 2.3 V | |||
| D105-93 (VCPM) - D105-116 (EPIM) | L - Y | Power source of manifold absolute pressure sensor | Ignition switch ON | 4.5to 5.5 V |
| B88-29 (IREL) - D105-109 (E1) | R - BR | EDU relay | Ignition switch ON | 0 to 1.5 V |
| B88-13 (TACH) - D105-109 (E1) | B - BR | Engine speed | Idling | Pulse generation (see waveform 4) |
| D105-66 (PCR1) - D105-67 (E2S) | P - Y | Fuel pressure sensor | Idling | 1.7 to 2.2 V |
| D105-68 (VCS) - D105-67 (E2S) | L - Y | Power source of fuel pressure sensor | Ignition switch ON | 4.5 to 5.5 V |
| D105-58 (GREL) - D105-109 (E1) | G - BR | GLOW relay | Cranking | 11 to 14 V |
| D105-112 (THF) - D105-89 (ETHF) | R - Y | Fuel temperature sensor | Ignition switch ON | 0.5 to 3.4 V |
| D105-54 (ALT) - D105-109 (E1) | W - BR | Generator duty ratio | Idling | Pulse generation (see waveform 5) |
| D105-41 (PCV+) - D105-81 (PCV-) | P - Y | Suction control valve | Idling | Pulse generation (see waveform 6) |
| D105-51 (INJF) - D105-109 (E1) | LG - BR | EDU | Idling | Pulse generation (see waveform 7) |
| D105-119 (VLU) - D105-96 (EVLU) | R - Y | 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 | |||
| D105-97 (VCVL) - D105-96 (EVLU) | L - Y | Power source of throttle position sensor | Ignition switch ON | 4.98 to 5.02 V |
| D105-78 (LUSL) - D105-109 (E1) | B - BR | Diesel throttle motor duty signal | Engine warmed up, racing engine | Pulse generation (see waveform 8) |
| D105-83 (EGR) - D105-109 (E1) | B - BR | VRV for EGR | Ignition switch ON | Pulse generation (see waveform 9) |
| D105-38 (NSW)* - D105-109 (E1) | B - BR | Park/neutral position switch assembly | Ignition switch ON, shift lever in P or N | Below 3 V |
| Ignition switch ON, shift lever not in P and N | 11 to 14 V | |||
| B88-6 (CANH) - D105-109 (E1) | B - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 10) |
| B88-7 (CANL) - D105-109 (E1) | W - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 11) |
| B88-4 (CAN+)* - D105-109 (E1) | L - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 10) |
| B88-5 (CAN-)* - D105-109 (E1) | Y - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 11) |
Tech Tips
*: for Automatic Transmission
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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
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 9
VRV for 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 VRV for EGR operation.
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WAVEFORM 9
CAN Communication Signal ECM Terminal Name Between CANH and E1
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 10
CAN Communication Signal ECM Terminal Name Between CANL and E1
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.