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Home >> Nissan-Datsun >> 2008 >> Sentra Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Introduction (MR20DE) >> Trouble Diagnosis >> ECM Terminals and Reference Value >> ECM Inspection Table
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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.
ECM INSPECTION CHART

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
G04925166Courtesy of NISSAN MOTOR CO., U.S.A.
2 Y/B Throttle control motor power supply [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
3 BR/W A/F sensor 1 heater [Engine is running] 
  • Warm-up condition 
  • Idle speed (More than 140 seconds after starting engine)
G04900085Courtesy of NISSAN MOTOR CO., U.S.A.
4 L/R Throttle control motor (Close) [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/T)
  • Accelerator pedal: Fully released
G04925168Courtesy of NISSAN MOTOR CO., U.S.A.
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.
G04900085Courtesy 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)
9 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)
G04925171Courtesy of NISSAN MOTOR CO., U.S.A.
10
11		 B
B		 ECM ground [Engine is running] 
  • Idle speed
 Body ground
15 G/Y Throttle control motor relay [Ignition switch: OFF]  BATTERY VOLTAGE (11 - 14V)
[Ignition switch: ON]  0 - 1.0V
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.
G04925172Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 RPM.
G04925173Courtesy of NISSAN MOTOR CO., U.S.A.
23 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)
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.
G04894542Courtesy 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.
28 L/Y EVAP canister vent control valve [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
32 R/G ECM relay (Self shut-off) [Engine is running] 
[Ignition switch: OFF] 
  • For a few seconds after turning ignition switch OFF
 0 - 1.0V
[Ignition switch: OFF] 
  • More than a few seconds after turning ignition switch OFF
 BATTERY VOLTAGE (11 - 14V)
33 Y/B 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
34 R/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
36 BR/W Sensor ground (Throttle position sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
37 W Knock sensor [Engine is running] 
  • Idle speed
 Approximately 2.5V
38 P Engine coolant temperature sensor [Engine is running]  Approximately 0 - 4.8V
Output voltage varies with engine coolant temperature.
40 - Sensor ground (Knock sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
41 L Refrigerant pressure sensor [Engine is running] 
  • Warm-up condition 
  • Both A/C switch and blower fan switch: ON (Compressor operates.)
 1.0 - 4.0V
42 R/B EVAP control system pressure sensor [Ignition switch: ON]  Approximately 1.8 - 4.8V
43 G/O Fuel tank temperature sensor [Engine is running]  Approximately 0 - 4.8V
Output voltage varies with fuel tank temperature
44 GR Sensor ground (Engine coolant temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
45 V Mass air flow sensor [Engine is running] 
  • Warm-up condition 
  • Idle speed
 0.9 - 1.2V
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 RPM
 1.5 - 1.8V
46 BR/Y Intake air temperature sensor [Engine is running]  Approximately 0 - 4.8V
Output voltage varies with intake air temperature.
48 R/G Sensor ground (Refrigerant pressure sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
49 L/R A/F sensor 1 [Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 RPM
 Approximately 1.8V
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 1.0V
51 V/R Sensor ground (EVAP control system pressure sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
52 B/W Sensor ground (Mass air flow sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
53 L/G A/F sensor 1 [Ignition switch: ON]  Approximately 2.2V
55 O Sensor ground (Intake air temperature sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
59 B/Y Sensor ground (Heated oxygen sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
61 Y Crankshaft position sensor (POS) [Engine is running] 
  • Warm-up condition 
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle.
G04925176Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Engine speed: 2, 000 RPM
G04925177Courtesy of NISSAN MOTOR CO., U.S.A.
62 B/P Sensor ground [Crankshaft position sensor (POS)] [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
63 B/R Sensor ground [Camshaft position sensor (PHASE)] [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
65 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.
69 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
72 BR Sensor power supply (Throttle position sensor) [Ignition switch: ON]  Approximately 5V
73 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.
74 G/W Sensor power supply (Refrigerant pressure sensor) [Ignition switch: ON]  Approximately 5V
75 G/R Sensor power supply [Crankshaft position sensor (POS)] [Ignition switch: ON]  Approximately 5V
76 V/W EVAP control system pressure sensor power supply [Ignition switch: ON]  Approximately 5V
78 G/Y Sensor power supply [Camshaft position sensor (PHASE)] [Ignition switch: ON]  Approximately 5V
83 P CAN communication line [Ignition switch: ON]  Approximately 1.7 - 2.3V
Output voltage varies with the communication status.
84 L CAN communication line [Ignition switch: ON]  Approximately 2.6 - 3.2V Output voltage varies with the communication status.
88 P/L DATA link connector [Ignition switch: ON] 
  • CONSULT-III or GST: Disconnected.
 Approximately 10.5V
93 B/R Ignition switch [Ignition switch: OFF]  0V
[Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
94 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
95 B/Y Sensor ground (ASCD steering switch) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
99 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)
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 0V
[Ignition switch: ON] 
  • Brake pedal: Fully released (CVT)
  • Brake pedal and clutch pedal: Fully released (M/T)
 BATTERY VOLTAGE (11 - 14V)
102 BR/Y Sensor power supply (Accelerator pedal position sensor 2) [Ignition switch: ON]  Approximately 5V
103 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
104 B/P Sensor ground (Accelerator pedal position sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
105 G Power supply for ECM [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
106 O Sensor power supply (Accelerator pedal position sensor 1) [Ignition switch: ON]  Approximately 5V
108 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 - 0.9V
[Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully depressed
 3.9 - 4.7V
111 B/W Sensor ground (Accelerator pedal position sensor 1) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
*: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
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