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Home >> Nissan-Datsun >> 2014 >> Sentra SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Introduction) >> Ecu Diagnosis Information >> ECM >> Reference Value >> Physical Values
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Physical Values

NOTE:
  • ECM is located in the engine room left side near battery.
  • Specification data are reference values and are measured between each terminal and ground.
  • Pulse signal is measured by CONSULT.
Terminal No. (Wire color) Description Condition Value (Approx.)
+ - Signal name Input/Output
1 (P) 128 (B/Y) Throttle control motor (Close) Output [Ignition switch: ON]
  • Engine stopped
  • Selector lever: D (CVT)
  • Shifter lever: 1st (M/T)
  • Accelerator pedal: Fully released
 1.8 V(1)
G05914703
2 (G) 128 (B/Y) Throttle control motor power supply Input [Ignition switch: ON] Battery voltage (11 - 14 V)
3 (W) 128 (B/Y) Throttle control motor (Open) Output [Ignition switch: ON]
  • Engine stopped
  • Selector lever: D (CVT)
  • Shifter lever: 1st (M/T)
  • Accelerator pedal: Fully depressed
 3.2 V(1)
G05914701
4 (W) 8 (B) Knock sensor Input [Engine is running]
  • Idle speed
 2.5 V
5 (G) 128 (B/Y) Intake manifold tuning valve motor (Close) Output [Ignition switch ON]
  • Engine coolant temperature: Normal operating condition
  • Accelerator pedal: Depressed → fully released
 Battery voltage appears for about 1 second.
6 (R) 128 (B/Y) Intake manifold tuning valve motor power supply Input [Ignition switch: ON] Battery voltage (11 - 14 V)
7 (R) 128 (B/Y) Intake manifold tuning valve motor (Open) Output [Ignition switch ON]
  • Engine coolant temperature: normal operating condition
  • Accelerator pedal: Fully released → depressed
 Battery voltage appears for about 1 second.
8 (B) - Sensor ground (Knock sensor) - - -
9 (BR)
10 (SB)
13 (O)
14 (V)		 128 (B/Y) Fuel injector No. 4
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 2		 Output [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on rpm at idle
 Battery voltage (11 - 14 V)(1)
G09458326
[Engine is running]
  • Warm-up condition
  • Engine speed: 2, 000 rpm
 Battery voltage (11 - 14 V)(1)
G05696281
12 (B) - ECM ground - - -
16 (B) - ECM ground - - -
17 (L) 128 (B/Y) EVAP canister purge volume control solenoid valve Output [Engine is running]
  • Idle speed
  • Accelerator pedal: Not depressed even slightly, after engine starting
 Battery voltage (11 - 14 V)(1)
G05696278
[Engine is running]
  • Engine speed: About 2, 000 rpm (More than 100 seconds after starting engine.)
 10 V(1)
G05914706
18 (GR) 128 (B/Y) Fuel pump relay Output [Ignition switch: ON]
  • For 1 second after turning ignition switch ON

    [Engine is running]

 0 - 1.0 V
[Ignition switch: ON]
  • More than 1 second after turning ignition switch ON
 Battery voltage (11 - 14 V)
21 (Y) 128 (B/Y) Throttle control motor relay Output [Ignition switch: OFF] Battery voltage (11 - 14 V)
[Ignition switch: ON] 0 - 1.0 V
22 (W) 23 (BR) Heated oxygen sensor 2 Input [Engine is running]
  • Revving engine from idle to 3, 000 rpm quickly after the following conditions are met
    • Engine: after warming up
    • Keeping the engine speed between 3, 500 and 4, 000 rpm for 1 minute and at idle for 1 minute under no load
 0 - 1.0 V
23 (BR) - Sensor ground (Heated oxygen sensor 2) - - -
25 (Y) 26 (P) Engine oil temperature sensor Input [Engine is running] 0 - 4.8 V Output voltage varies with engine oil temperature.
26 (P) - Sensor ground
(Engine oil temperature sensor)		 - - -
27 (LG) - Sensor ground (Engine coolant temperature sensor) - - -
28 (V) 27 (LG) Engine coolant temperature sensor Input [Engine is running] 0 - 4.8 V
Output voltage varies with engine coolant temperature.
30 (L) - Sensor ground
[Camshaft position sensor (PHASE)]		 - - -
31 (BR) 30 (L) Camshaft position sensor (PHASE) Input [Engine is running]
  • Warm-up condition
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle
 1.0 - 2.0(1)
G09458330
[Engine is running]
  • Engine speed is 2, 000 rpm
 1.0 - 2.0(1)
G09458331
32 (GR) - Sensor power supply
[Camshaft position sensor (PHASE)]		 - [Ignition switch: ON] 5.0 V
33 (GR) 34 (W) Intake air temperature sensor Input [Engine is running] 0 - 4.8 V
Output voltage varies with intake air temperature.
34 (W) - Sensor ground
(Mass air flow sensor, intake air temperature sensor)		 - - -
35 (G) 34 (W) Mass air flow sensor Input [Ignition switch: ON]
  • Engine stopped
 1.27 V
[Engine is running]
  • Warm-up condition
  • Idle speed
 1.3 - 1.6 V
[Engine is running]
  • Warm-up condition
  • Engine is revving from idle to about 4, 000 rpm
 1.3 - 1.6 → 2.6 V (Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.)
36 (R) - Sensor power supply (Mass air flow sensor, intake air temperature sensor) - [Ignition switch: ON] 5.0 V
37 (B) - Shield - - -
38 (W) - Sensor ground
(Engine oil pressure sensor)		 - - -
39 (G) 38 (W) Engine oil pressure sensor Input [Engine is running]
  • Warm-up condition
  • Idle speed
 1.3 V(1)
G08097021
[Engine is running]
  • Warm-up condition
  • Engine speed is 2, 000 rpm
 2.7 V(1)
G08097022
40 (R) 38 (W) Sensor power supply (Engine oil pressure sensor) - [Ignition switch: ON] 5.0 V
41 (Y) 128 (B/Y) A/F sensor 1 Input Engine running]
  • Warm-up condition
  • Engine speed: 2, 000 rpm
 2.2 V (Output voltage varies with air-fuel ratio)
42 (W) - Sensor ground [Exhaust valve timing control position sensor] - - -
43 (P) 42 (W) Exhaust valve timing control position sensor Input [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on rpm at idle
 1.0(1)
G09458334
[Engine is running]
  • Engine speed is 2, 500 rpm
 1.0(1)
G09458335
44 (R) - Sensor power supply
[Exhaust valve timing control position sensor]		 - [Ignition switch: ON] 5 V
45 (BR) 128 (B/Y) A/F sensor 1 Input [Engine is running]
  • Engine speed is 2, 000 rpm
 2.2 V Output voltage varies with air fuel ratio.
49 (G) 128 (B/Y) Intake manifold runner control valve motor (Close) Output [Ignition switch ON]
  • Engine coolant temperature: More than 60°C (140°F)
  • Accelerator pedal: Depressed → fully released
 Battery voltage appears for about 1 second.
50 (R) 128 (B/Y) Intake manifold runner control valve motor power supply Input [Ignition switch: ON] Battery voltage (11 - 14 V)
51 (R) 128 (B/Y) Intake manifold runner control valve motor (Open) Output [Ignition switch ON]
  • Engine coolant temperature: More than 60°C (140°F)
  • Accelerator pedal: Fully released → depressed
 Battery voltage appears for about 1 second.
52 (B) - ECM ground - - -
53 (G) 128 (B/Y) A/F sensor 1 heater Input [Engine is running]
  • Warm-up condition
  • Idle speed

    (More than 260 seconds after starting engine)

 10 V(1)
G08097040
54 (G) 128 (B/Y) Heated oxygen sensor 2 heater Output [Engine is running]
  • Engine speed: Below 3, 600 rpm after the following conditions are met
    • Engine: after warming up
    • Keeping the engine speed between 3, 500 and 4, 000 rpm for 1 minute and at idle for 1 minute under no load
 8 V(1)
G05914702
[Ignition switch: ON]
  • Engine stopped

    [Engine is running]

  • Engine speed: Above 3, 600 rpm
 Battery voltage (11 - 14 V)
61 (BG) 62 (BR) Battery temperature sensor Input [Engine is running]
  • Battery temperature: 25°C (°F)
  • Idle speed
 3.3 V
62 (BR) - Sensor ground
(Battery current sensor, battery temperature sensor)		 - - -
63 (G) 62 (BR) Battery current sensor Input [Engine is running]
  • Battery: Fully charged(1)
  • Idle speed
 2.6 - 3.5 V
64 (Y) - Sensor power supply (Battery current sensor) - [Ignition switch: ON] 5.0 V
70 (W) - Sensor ground
[Crankshaft position sensor (POS)]		 - - -
71 (R) 70 (W) Crankshaft position sensor (POS) Input [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on rpm at idle
 1.0 V(1)
G08097031
[Engine is running]
  • Engine speed: 2, 000 rpm
 1.0 V(1)
G08097032
72 (G) - Sensor power supply
[Crankshaft position sensor (POS)]		 - [Ignition switch: ON] 5.0 V
73 (GR) - Shield - - -
77 (W) 78 (R) Throttle position sensor 2 Input [Ignition switch: ON]
  • Engine stopped
  • Selector lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
 Less than 4.75 V
[Ignition switch: ON]
  • Engine stopped
  • Selector lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
 More than 0.36 V
78 (R) - Sensor ground (Throttle position sensor) - - -
79 (G) 78 (R) Throttle position sensor 1 Input [Ignition switch: ON]
  • Engine stopped
  • Selector lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
 More than 0.36 V
[Ignition switch: ON]
  • Engine stopped
  • Selector lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
 Less than 4.75 V
80 (B) - Sensor power supply (Throttle position sensor) - [Ignition switch: ON] 5.0 V
81 (Y) 128 (B/Y) Power supply for ECM (Backup) Input [Ignition switch: OFF] Battery voltage (11 - 14 V)
83 (LG) 92 (V) Intake manifold runner control valve position sensor Input [Ignition switch ON]
  • Engine coolant temperature: Between 0°C (32°F) and 45°C (113°F)
  • Accelerator pedal: Fully released
 Less than 2.4 V
[Ignition switch ON]
  • Engine coolant temperature: Between 0°C (32°F) and 45°C (113°F)
  • Accelerator pedal: Slightly depressed
 More than 3.5 V
84 (W) - Sensor power supply
(Intake manifold runner control valve position sensor)		 - [Ignition switch: ON] More than 4.98 V
86 (R) 128 (B/Y) Ignition signal No. 1 Output [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on rpm at idle
 0 - 0.1 V(1)
G06933093
87 (LG) Ignition signal No. 2
90 (P) Ignition signal No. 3 [Engine is running]
  • Warm-up condition
  • Engine speed: 2, 000 rpm
 0 - 0.2 V(1)
G08097037
91 (SB) Ignition signal No. 4
89 (GR) 128 (B/Y) ECM relay (Self shut-off) Output [Engine is running]
[Ignition switch: OFF]
  • A few seconds after turning ignition switch OFF
 0 - 1.0 V
[Ignition switch: OFF]
  • More than a few seconds after turning ignition switch OFF
 Battery voltage (11 - 14 V)
92 (LG) - Sensor ground
(Intake manifold runner control valve position sensor)		 - - -
93 (LG) 128 (B/Y) Intake valve timing control solenoid valve Output [Engine is running]
  • Warm-up condition
  • Idle speed
 0 V
[Engine is running]
  • Warm-up condition
  • When revving engine up to 2, 000 rpm quickly
 11 - 14 V(1)
G05921444
94 (G) 128 (B/Y) Exhaust valve timing control solenoid valve Output [Engine is running]
  • Warm-up condition
  • Idle speed
 0 V
[Engine is running]
  • Warm-up condition
  • Engine speed: 2, 000 rpm
 Battery voltage (11 - 14 V)
97 (BR) 128 (GR) EVAP canister vent control valve Output [Ignition switch: ON] Battery voltage (11 - 14 V)
99 (P) - CAN communication line (CAN-L) Input/Output - -
100 (L) - CAN communication line (CAN-H) Input/Output - -
101 (G) 128 (B/Y) Starter relay cut off signal Input/Output [Ignition switch: ON] 0 V
[Engine is running]
  • Warm-up condition
  • Idle speed
 Battery voltage (11 - 14 V)
103 (P) 124 (Y) Refrigerant pressure sensor Input [Engine is running]
  • Warm-up condition
  • Both A/C switch and blower fan motor switch: ON (Compressor operates)
 1.0 - 4.0 V
104 (L) - Sensor power supply (Refrigerant pressure sensor) - [Ignition switch: ON] 5.0 V
105 (V) 128 (B/Y) Starter motor relay control signal Output [Engine is running]
  • Warm-up condition
  • Idle speed
  • Selector lever: D (CVT)
  • Shift lever: 1st (M/T)
  • Engine speed: Less than 1, 500 rpm
NOTE: To decrease engine speed, perform the DTC confirmation procedure B in P1650. Refer to "DTC LOGIC ".
 0 V (While operating the starter motor)
[Engine is running]
  • Warm-up condition
  • Idle speed
 Battery voltage (11 - 14 V)
109 (O) 128 (B/Y) Ignition switch Input [Ignition switch: OFF] 0 V
[Ignition switch: ON] Battery voltage (11 - 14 V)
110 (P) 111 (B) ASCD steering switch Input [Ignition switch: ON]
  • ASCD steering switch: OFF
 4 V
[Ignition switch: ON]
  • MAIN switch: Pressed
 0 V
[Ignition switch: ON]
  • CANCEL switch: Pressed
 1 V
[Ignition switch: ON]
  • ACCEL/RES switch: Pressed
 3 V
[Ignition switch: ON]
  • COAST/SET switch: Pressed
 2 V
111 (B) - Sensor ground (ASCD steering switch) - - -
113 (G) - Sensor power supply (EVAP control system pressure sensor) - [Ignition switch: ON] 5.0 V
114 (P) 124 (SB) EVAP control system pressure sensor Input [Ignition switch: ON] 0.5 - 4.6 V
115 (SB) 128 (B/Y) Stop lamp switch Input [Ignition switch: OFF]
  • Brake pedal: Fully released
 0 V
[Ignition switch: OFF]
  • Brake pedal: Slightly depressed
 Battery voltage (11 - 14 V)
116 (G) 128 (B/Y) Brake pedal position switch Input [Ignition switch: OFF]
  • Brake pedal: Fully released
 Battery voltage (11 - 14 V)
[Ignition switch: OFF]
  • Brake pedal: Slightly depressed
 0 V
117 (BR) 128 (B/Y)
  • PNP signal (CVT)
  • Neutral switch (M/T)
 Input [Ignition switch: ON]
  • Selector lever: P or N (CVT)
  • Shifter lever: Neutral (M/T)
 Battery voltage (11 - 14 V)
[Ignition switch: ON]
  • Except above
 0 V
118 (O) - Sensor power supply
(Accelerator pedal position sensor 2)		 - [Ignition switch: ON] 5.0 V
119 (W) 120 (Y) Accelerator pedal position sensor 2 Input [Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully released
 0.3 - 0.6 V
[Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully depressed
 1.95 - 2.4 V
120 (Y) - Sensor ground
(Accelerator pedal position sensor 2)		 - - -
121 (G) 128 (B/Y) Power supply for ECM Input [Ignition switch: ON] Battery voltage (11 - 14 V)
122 (V) - Sensor power supply (Accelerator pedal position sensor 1) - [Ignition switch: ON] 5.0 V
23 (B/Y) - ECM ground - - -
124 (V) - Sensor ground
(EVAP control system pressure sensor, refrigerant pressure sensor)		 - - -
126 (R) 127 (GR) Accelerator pedal position sensor 1 Input [Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully released
 0.6 - 0.9 V
[Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully depressed
 3.9 - 4.7 V
127 (GR) - Sensor ground
(Accelerator pedal position sensor 1)		 - - -
128 (B/Y) - ECM ground - - -
(1) Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
(2) Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to "HOW TO HANDLE BATTERY ".
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