2008 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

ECM Inspection Table

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-III.

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.
INPUT/OUTPUT VOLTAGE CHART

TERMINAL NO. WIRE COLOR ITEM CONDITION DATA (DC Voltage)
2 Y/B Throttle control motor power supply [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
4 BR/W A/F sensor 1 heater (Bank 1) [Engine is running] 
  • Warm-up condition 
  • Idle speed (More than 140 seconds after starting engine)
G04900085Courtesy of NISSAN MOTOR CO., U.S.A.
5 W Throttle control motor (Open) [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
G04925760Courtesy of NISSAN MOTOR CO., U.S.A.
6 L/R Throttle control motor (Close) [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
G04925761Courtesy of NISSAN MOTOR CO., U.S.A.
8 BR/Y A/F sensor 1 heater (Bank 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed (More than 140 seconds after starting engine)
G04900085Courtesy of NISSAN MOTOR CO., U.S.A.
9
10
11
21		 Y
BR/Y
V
G		 Ignition signal No. 3
Ignition signal No. 2
Ignition signal No. 1
Ignition signal No. 4		 [Engine is running] 
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle.
G04925763Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 RPM.
G04925764Courtesy of NISSAN MOTOR CO., U.S.A.
12
16		 B
B		 ECM ground [Engine is running] 
  • Idle speed
 Body ground
13 B Heated oxygen sensor 2 heater (Bank 1) [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.
G04925765Courtesy of NISSAN MOTOR CO., U.S.A.
[Ignition switch: ON] 
  • Engine stopped

[Engine is running] 
  • Engine speed: Above 3, 600 RPM.
 BATTERY VOLTAGE (11 - 14V)
14 B/O Fuel pump relay [Ignition switch: ON] 
  • For 1 second after turning ignition switch ON

[Engine is running] 		 0 - 1.0V
[Ignition switch: ON] 
  • More than 1 second after turning ignition switch ON
 BATTERY VOLTAGE (11 - 14V)
15 G/Y Throttle control motor relay [Ignition switch: OFF]  BATTERY VOLTAGE (11 - 14V)
[Ignition switch: ON]  0 - 1.0V
17 R/L Heated oxygen sensor 2 heater (Bank 2) [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
  • d 4, 000 RPM for 1 minute and at idle for 1 minute under no load. Approximately 10V
G04925765Courtesy of NISSAN MOTOR CO., U.S.A.
[Ignition switch: ON] 
  • Engine stopped

[Engine is running] 
  • Engine speed: Above 3, 600 RPM.
 BATTERY VOLTAGE (11 - 14V)
24 R/B ECM relay (Self shut-off) [Engine is running] 
[Ignition switch: OFF] 
  • For a few seconds after turning ignition switch OFF
 0 - 1.0V
[Ignition switch: OFF] 
  • More than a few seconds after turning ignition switch OFF
 BATTERY VOLTAGE (11 - 14V)
25 W/B EVAP canister purge volume control solenoid valve [Engine is running] 
  • Idle speed
  • Accelerator pedal: Not depressed even slightly, after engine starting.
G04900462Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Engine speed: About 2, 000 RPM (More than 100 seconds after starting engine)
G04925768Courtesy of NISSAN MOTOR CO., U.S.A.
29
30
31
32		 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.
G04895182Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 RPM
G04925175Courtesy of NISSAN MOTOR CO., U.S.A.
33 G Heated oxygen sensor 2 (Bank 1) [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 1.0V
34 W Heated oxygen sensor 2 (Bank 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 1.0V
35 B Sensor ground (Heated oxygen sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
36 G Sensor ground (Throttle position sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
37 R Throttle position sensor 1 [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
 More than 0.36V
[Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
 Less than 4.75V
38 W Throttle position sensor 2 [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
 Less than 4.75V
[Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully depressed
 More than 0.36V
39 L Refrigerant pressure sensor [Engine is running] 
  • Warm-up condition 
  • Both A/C switch and blower fan switch: ON (Compressor operates)
 1.0 - 4.0V
40 R/G Sensor ground (Refrigerant pressure sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
45 W A/F sensor 1 (Bank 1) [Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 RPM
 Approximately 1.8V
Output voltage varies with air fuel ratio.
46 P Engine coolant temperature sensor [Engine is running]  Approximately 0 - 4.8V
Output voltage varies with engine coolant temperature.
47 B Sensor power supply (Throttle position sensor) [Ignition switch: ON]  Approximately 5V
49 B A/F sensor 1 (Bank 1) [Ignition switch: ON]  Approximately 2.2V
50 BR/Y Intake air temperature sensor [Engine is running]  Approximately 0 - 4.8V 
Output voltage varies with intake air temperature.
52 GR Sensor ground (Engine coolant temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
53 W A/F sensor 1 (Bank 2) [Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 RPM
 Approximately 1.8V
Output voltage varies with air fuel ratio.
56 B Sensor ground [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
57 R A/F sensor 1 (Bank 2) [Ignition switch: ON]  Approximately 2.2V
58 V Mass air flow sensor [Engine is running] 
  • Warm-up condition 
  • Idle speed
 0.9 - 1.1V
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 RPM
 1.4 - 1.7V
59 G/Y Sensor power supply [Camshaft position sensor (PHASE)] [Ignition switch: ON]  Approximately 5V
60 B Sensor ground [Crankshaft position sensor (POS)] [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
61 W Knock sensor [Engine is running] 
  • Idle speed
 Approximately 2.5V
64 B Sensor ground [Camshaft position sensor (PHASE)] [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
65 Y Crankshaft position sensor (POS) [Engine is running] 
  • Warm-up condition 
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle.
G04925771Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Engine speed: 2, 000 RPM
G04925177Courtesy of NISSAN MOTOR CO., U.S.A.
67 - Sensor ground (Knock sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
69 R Camshaft position sensor (PHASE) [Engine is running] 
  • Warm-up condition 
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle.
G04925178Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Engine speed: 2, 000 RPM.
G04925179Courtesy of NISSAN MOTOR CO., U.S.A.
72 G/W Sensor power supply (Refrigerant pressure sensor) [Ignition switch: ON]  Approximately 5V
76 G/R Sensor power supply [Crankshaft position sensor (POS)] [Ignition switch: ON]  Approximately 5V
77 Y/R Power supply for ECM (Back-up) [Ignition switch: OFF]  BATTERY VOLTAGE (11 - 14V)
78 Y/R Intake valve timing control solenoid valve [Engine is running] 
  • Warm-up condition 
  • Idle speed
 BATTERY VOLTAGE (11 - 14V)
[Engine is running] 
  • Warm-up condition 
  • When revving engine up to 2, 000 RPM quickly
G04925180Courtesy of NISSAN MOTOR CO., U.S.A.
81 W Accelerator pedal position sensor 1 [Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully released
 0.6 - 0.9V
[Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully depressed
 3.9 - 4.7V
82 Y/G Accelerator pedal position sensor 2 [Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully released
 0.3 - 0.6V
[Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully depressed
 1.95 - 2.4V
83 O Sensor power supply (Accelerator pedal position sensor 1) [Ignition switch: ON]  Approximately 5V
84 B/W Sensor ground (Accelerator pedal position sensor 1) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
85 L/Y ASCD steering switch [Ignition switch: ON] 
  • ASCD steering switch: OFF
 Approximately 4V
[Ignition switch: ON] 
  • MAIN switch: Pressed
 Approximately 0V
[Ignition switch: ON] 
  • CANCEL switch: Pressed
 Approximately 1V
[Ignition switch: ON] 
  • RESUME/ACCELERATE switch: Pressed
 Approximately 3V
[Ignition switch: ON] 
  • SET/COAST switch: Pressed
 Approximately 2V
86 R/B EVAP control system pressure sensor [Ignition switch: ON]  Approximately 1.8 - 4.8V
87 BR/Y Sensor power supply (Accelerator pedal position sensor 2) [Ignition switch: ON]  Approximately 5V
88 P/L DATA link connector [Ignition switch: ON] 
  • CONSULT-III or GST: Disconnected.
 Approximately 10.5V
91 V/W Sensor power supply (EVAP control system pressure sensor) [Ignition switch: ON]  Approximately 5V
92 B/Y Sensor ground (ASCD steering switch) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
93 B/R Ignition switch [Ignition switch: OFF]  0V
[Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
95 G/O Fuel tank temperature sensor [Engine is running]  Approximately 0 - 4.8V Output voltage varies with fuel tank temperature
96 V/R Sensor ground (EVAP control system pressure sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
97 P CAN communication line - -
98 L CAN communication line - -
100 B Sensor ground (Accelerator pedal position sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
102 BR/R Park/neutral position (PNP) switch [Ignition switch: ON] 
  • Shift lever: P or N (CVT), Neutral (M/T)
 BATTERY VOLTAGE (11 - 14V)
[Ignition switch: ON] 
  • Except above
 Approximately 0V
104 B/P Sensor ground (Fuel tank temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
105 G Power supply for ECM [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
106 R/G Stop lamp switch [Ignition switch: OFF] 
  • Brake pedal: Fully released
 Approximately 0V
[Ignition switch: OFF] 
  • Brake pedal: Slightly depressed
 BATTERY VOLTAGE (11 - 14V)
107
108		 B ECM ground [Engine is running] 
  • Idle speed
 Body ground
109 L/Y EVAP canister vent control valve [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
110 G/B ASCD brake switch [Ignition switch: ON] 
  • Brake pedal: Slightly depressed (CVT)
  • Brake pedal and/or clutch pedal: Slightly depressed (M/T)
 Approximately 0V
[Ignition switch: ON] 
  • Brake pedal: Fully released (CVT)
  • Brake pedal and clutch pedal: Fully released (M/T)
 BATTERY VOLTAGE (11 - 14V)
111
112		 B ECM ground [Engine is running] 
  • Idle speed
 Body ground
*: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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