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Home >> Nissan-Datsun >> 2012 >> Sentra Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction (MR20DE) (Except CALIFORNIA) >> Service Information >> Trouble Diagnosis >> ECM Terminal and Reference Value >> ECM Inspection Table
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

ECM Inspection Table

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECMs transistor. Use a ground other than ECM terminals, such as the ground.
Terminal No. Wire color Item Condition Data (DC voltage)
1 V Throttle control motor (Open) [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
 Approximately 3.2 V(1)
G05922056Courtesy of NISSAN NORTH AMERICA, INC.
2 Y/B Throttle control motor power supply [Ignition switch: ON]  Battery voltage (11 - 14 V)
3 BR/W A/F sensor 1 heater [Engine is running] 
  • Warm-up condition 
  • Idle speed

(More than 140 seconds after starting engine)		 Approximately 2.9 - 8.8 V(1)
G04896959Courtesy of NISSAN NORTH AMERICA, INC.
4 L/R Throttle control motor (Close) [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
 Approximately 1.8 V(1)
G05921431Courtesy of NISSAN NORTH AMERICA, INC.
5 B/W Heated oxygen sensor 2 heater [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.
 Approximately 10 V(1)
G04896959Courtesy of NISSAN NORTH AMERICA, INC.
[Ignition switch: ON] 
  • Engine stopped

    [Engine is running] 

  • Engine speed: Above 3, 600 rpm.
 Battery voltage (11 - 14 V)
9 W/B EVAP canister purge volume control solenoid valve [Engine is running] 
  • Idle speed
  • Accelerator pedal: Not depressed even slightly, after engine starting.
 Battery voltage (11 - 14 V)(1)
G04894545Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Engine speed: About 2, 000 rpm (More than 100 seconds after starting engine)
 Approximately 10 V(1)
G05921435Courtesy of NISSAN NORTH AMERICA, INC.
10
11		 B
B		 ECM ground [Engine is running] 
  • Idle speed
 Body ground
12 GR Sensor ground (Engine oil temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Body ground
14 BR/R PNP signal [Ignition switch: ON] 
  • Shift lever: P or N (CVT), Neutral (M/T)
 Battery voltage (11 - 14 V)
[Ignition switch: ON] 
  • Except above
 Approximately 0 V
15 G/Y Throttle control motor relay [Ignition switch: OFF]  Battery voltage (11 - 14 V)
[Ignition switch: ON]  0 - 1.0 V
17
18
21
22		 V
BR/Y
G
Y		 Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 4
Ignition signal No. 3		 [Engine is running] 
  • Warm-up condition 
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
 0 - 0.3 V(1)
G04926268Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 rpm.
 0.2 - 0.5 V(1)
G05921437Courtesy of NISSAN NORTH AMERICA, INC.
23 B/O Fuel pump relay [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)
25
29
30
31		 R
O
GR
L		 Fuel injector No. 4
Fuel injector No. 3
Fuel injector No. 2
Fuel injector No. 1		 [Engine is running] 
  • Warm-up condition 
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
 Battery voltage (11 - 14 V)(1)
G04894542Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 rpm
 Battery voltage (11 - 14 V)(1)
G05921439Courtesy of NISSAN NORTH AMERICA, INC.
27 W Engine oil temperature sensor [Engine is running]  Approximately 0 - 4.8 V Output voltage varies with engine coolant temperature
28 L/Y EVAP canister vent control valve [Ignition switch: ON]  Battery voltage (11 - 14 V)
32 R/G ECM relay (Self shut-off) [Engine is running] 
[Ignition switch: OFF] 
  • For 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)
33 G Throttle position sensor 1 [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
 More than 0.36 V
[Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
 Less than 4.75 V
34 W Throttle position sensor 2 [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
 Less than 4.75 V
[Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
 More than 0.36 V
36 B Sensor ground (Throttle position sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
37 W Knock sensor [Engine is running] 
  • Idle speed
 Approximately 2.5 V
38 P Engine coolant temperature sensor [Engine is running]  Approximately 0 - 4.8 V Output voltage varies with engine coolant temperature.
40 GR Sensor ground (Knock sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
41 L Refrigerant pressure sensor [Engine is running] 
  • Warm-up condition 
  • Both A/C switch and blower fan switch: ON (Compressor operates.)
 1.0 - 4.0 V
42 R/Y EVAP control system pressure sensor [Ignition switch: ON]  Approximately 1.8 - 4.8 V
43 G/O Fuel tank temperature sensor [Engine is running]  Approximately 0 - 4.8 V Output voltage varies with fuel tank temperature
44 GR Sensor ground (Engine coolant temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
45 V Mass air flow sensor [Engine is running] 
  • Warm-up condition 
  • Idle speed
 0.9 - 1.2 V
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 rpm
 1.5 - 1.8 V
46 BR/Y Intake air temperature sensor [Engine is running]  Approximately 0 - 4.8 V Output voltage varies with intake air temperature.
48 R/G Sensor ground (Refrigerant pressure sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
49 L/R A/F sensor 1 [Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 rpm
 Approximately 1.8 V Output voltage varies with air fuel ratio.
50 G Heated oxygen sensor 2 [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 - Approximately 1.0 V
51 V/R Sensor ground (EVAP control system pressure sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
52 B/W Sensor ground (Mass air flow sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
53 L/G A/F sensor 1 [Ignition switch: ON]  Approximately 2.2 V
55 O Sensor ground (Intake air temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
59 B/Y Sensor ground (Heated oxygen sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
60 B Sensor ground (Fuel tank temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
61 W Crankshaft position sensor (POS) [Engine is running] 
  • Warm-up condition 
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
 Approximately 4.0 V(1)
G05921440Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Engine speed: 2, 000 rpm
 Approximately 4.0 V(1)
G05921441Courtesy of NISSAN NORTH AMERICA, INC.
62 R Sensor ground [Crankshaft position sensor (POS)] [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
63 B/R Sensor ground [Camshaft position sensor (PHASE)] [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
65 R Camshaft position sensor (PHASE) [Engine is running] 
  • Warm-up condition 
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
 1.0 - 2.0 V(1)
G05921442Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Engine speed: 2, 000 rpm.
 1.0 - 2.0 V(1)
G05922069Courtesy of NISSAN NORTH AMERICA, INC.
66 Y/R Power supply for ECM (Buck-up) [Ignition switch: OFF]  Battery voltage (11 - 14 V)
72 R Sensor power supply (Throttle position sensor) [Ignition switch: ON]  Approximately 5 V
73 Y/R Intake valve timing control solenoid valve [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Battery voltage (11 - 14 V)
[Engine is running] 
  • Warm-up condition 
  • When revving engine up to 2, 000 rpm quickly
 7 - 10 V(1)
G05921444Courtesy of NISSAN NORTH AMERICA, INC.
74 G/W Sensor power supply (Refrigerant pressure sensor) [Ignition switch: ON]  Approximately 5 V
75 Y Sensor power supply [Crankshaft position sensor (POS)] [Ignition switch: ON]  Approximately 5 V
76 V/W EVAP control system pressure sensor power supply [Ignition switch: ON]  Approximately 5 V
78 G/Y Sensor power supply [Camshaft position sensor (PHASE)] [Ignition switch: ON]  Approximately 5 V
83 P CAN communication line - -
84 L CAN communication line - -
88 P/L DATA link connector - -
93 B/R Ignition switch [Ignition switch: OFF]  0 V
[Ignition switch: ON]  Battery voltage (11 - 14 V)
94 L/Y ASCD steering switch [Ignition switch: ON] 
  • ASCD steering switch: OFF
 Approximately 4 V
[Ignition switch: ON] 
  • MAIN switch: Pressed
 Approximately 0 V
[Ignition switch: ON] 
  • CANCEL switch: Pressed
 Approximately 1 V
[Ignition switch: ON] 
  • RESUME/ACCELERATE switch: Pressed
 Approximately 3 V
[Ignition switch: ON] 
  • SET/COAST switch: Pressed
 Approximately 2 V
95 B/Y Sensor ground (ASCD steering switch) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
99 R/G Stop lamp switch [Ignition switch: OFF] 
  • Brake pedal: Fully released
 Approximately 0 V
[Ignition switch: OFF] 
  • Brake pedal: Slightly depressed
 Battery voltage (11 - 14 V)
100 G/B ASCD brake switch [Ignition switch: ON] 
  • Brake pedal: Slightly depressed (CVT)
  • Brake pedal and/or clutch pedal: Slightly depressed (M/T)
 Approximately 0 V
[Ignition switch: ON] 
  • Brake pedal: Fully released (CVT)
  • Brake pedal and clutch pedal: Fully released (M/T)
 Battery voltage (11 - 14 V)
102 BR/Y Sensor power supply (Accelerator pedal position sensor 2) [Ignition switch: ON]  Approximately 5 V
103 Y/G Accelerator pedal position sensor 2 [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
104 B/P Sensor ground (Accelerator pedal position sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
105 G Power supply for ECM [Ignition switch: ON]  Battery voltage (11 - 14 V)
106 O Sensor power supply (Accelerator pedal position sensor 1) [Ignition switch: ON]  Approximately 5 V
107
108
109		 B
B
B		 ECM ground [Engine is running] 
  • Idle speed
 Body ground
110 W Accelerator pedal position sensor 1 [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
111 B/W Sensor ground (Accelerator pedal position sensor 1) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0 V
112 B ECM ground [Engine is running] 
  • Idle speed
 Body ground
(1) Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
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