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Home › Nissan-Datsun › 2007 › Sentra SE-R › Repair and Diagnosis › External Pages › Different car › Section 103 (Engine Control System - Introduction (QG18DE)) › Trouble Diagnosis › ECM Terminals and Reference Value › ECM Inspection Table

ECM Inspection Table

WARNING: This page is about a different car, the 2006 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

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

Pulse signal is measured by CONSULT-II.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's 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)
1 B ECM ground [Engine is running] 
  • Idle speed
 Body ground
2 R A/F sensor 1 heater [Engine is running] 
  • Warm-up condition
  • Idle speed
 Approximately 5V(1)
G04080403Courtesy of NISSAN MOTOR CO., U.S.A.
3 R/W Throttle control motor power supply [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
4 P Throttle control motor (Close) [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (A/T), 1st (M/T)
  • Accelerator pedal: Fully released
 0 - 14V(1)
G04147110Courtesy of NISSAN MOTOR CO., U.S.A.
5 L Throttle control motor (Open) [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (A/T), 1st (M/T)
  • Accelerator pedal: Fully depressed
 0 - 14V(1)
G04147111Courtesy of NISSAN MOTOR CO., U.S.A.
11 G/Y Intake valve timing control solenoid valve [Engine is running] 
  • Warm-up condition
  • Idle speed
 BATTERY VOLTAGE (11 - 14V)
[Engine is running] 
  • Warm-up condition
  • Engine speed: 2, 000 rpm
 7 - 10V(1)
G04074581Courtesy of NISSAN MOTOR CO., U.S.A.
12 P Power steering pressure sensor [Engine is running] 
  • Steering wheel: Being turned
 0.5 - 4.0V
[Engine is running] 
  • Steering wheel: Not being turned
 0.4 - 8V
13 Y Crankshaft position sensor (POS) [Engine is running] 
  • Warm-up condition
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
 Approximately 3.0V(1)
G04190853Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Engine speed: 2, 000 rpm
 Approximately 3.0V(1)
G04190854Courtesy of NISSAN MOTOR CO., U.S.A.
14 W/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 - 4.0V(1)
G04190855Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Engine speed: 2, 000 rpm.
 1.0 - 4.0V(1)
G04190856Courtesy of NISSAN MOTOR CO., U.S.A.
15 W Knock sensor [Engine is running] 
  • Idle speed
 Approximately 2.5V
16 OR/L A/F sensor 1 [Engine is running] 
  • Warm-up condition
  • Idle speed
 Approximately 3.1V
35 B/Y Approximately 2.6V
56 OR 2 - 3V
75 W/L 2 - 3V
22
23
41
42		 G/B
R/B
L/B
Y/B		 Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 4
Fuel injector No. 2		 [Engine is running] 
  • Warm-up condition
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
 BATTERY VOLTAGE (11 - 14V)(1)
G04147117Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Warm-up condition
  • Engine speed: 2, 000 rpm
 BATTERY VOLTAGE (11 - 14V)(1)
G04147118Courtesy of NISSAN MOTOR CO., U.S.A.
25 W/B 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 on load
 0 - 1.0V
[Ignition switch: ON] 
  • Engine stopped.

[Engine is running] 
  • Engine speed: Above 3, 600 rpm.
 BATTERY VOLTAGE (11 - 14V)
32 L EVAP control system pressure sensor [Ignition switch: ON]  Approximately 1.8 - 4.8V
34 Y/G Intake air temperature sensor [Engine is running]  Approximately 0 - 4.8V Output voltage varies with intake air temperature.
45 GY/L EVAP canister purge volume control solenoid valve [Engine is running] 
  • Idle speed
  • Accelerator pedal: Not depressed even slightly, after engine starting.
 BATTERY VOLTAGE (11 - 14V)(1)
G04074590Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Engine speed: About 2, 000 rpm (More than 100 seconds after starting engine)
 Approximately 10V(1)
G04190860Courtesy of NISSAN MOTOR CO., U.S.A.
47 B Sensor power supply
(Throttle position sensor)		 [Ignition switch: ON]  Approximately 5V
48 R/W Sensor power supply (EVAP control system pressure sensor) [Ignition switch: ON]  Approximately 5V
49 R/Y Sensor power supply (Refrigerant pressure sensor) [Ignition switch: ON]  Approximately 5V
50 W Throttle position sensor 1 [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (A/T), 1st (M/T)
  • Accelerator pedal: Fully released
 More than 0.36V
[Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (A/T), 1st (M/T)
  • Accelerator pedal: Fully depressed
 Less than 4.75V
51 L/R 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.
 1.4 - 1.8V
61
62
80
81		 L/W
BR
GY/R
PU		 Ignition signal No. 3
Ignition signal No. 1
Ignition signal No. 4
Ignition signal No. 2		 [Engine is running] 
  • Warm-up condition
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
 0 - 0.1V(1)
G04147122Courtesy of NISSAN MOTOR CO., U.S.A.
[Engine is running] 
  • Warm-up condition
  • Engine speed: 2, 000 rpm.
 0 - 0.2V(1)
G04190862Courtesy of NISSAN MOTOR CO., U.S.A.
66 R Sensor ground
(Throttle position sensor)		 [Engine is running] 
  • Warm-up condition
  • Idle speed
 Approximately 0V
67 B/W Sensor ground [Engine is running] 
  • Warm-up condition
  • Idle speed
 Approximately 0V
68 G/R Sensor power supply
(Power steering pressure sensor)		 [Ignition switch: ON]  Approximately 5V
69 G Throttle position sensor 2 [Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (A/T), 1st (M/T)
  • Accelerator pedal: Fully released
 Less than 4.75V
[Ignition switch: ON] 
  • Engine stopped
  • Shift lever: D (A/T), 1st (M/T)
  • Accelerator pedal: Fully depressed
 More than 0.36V
70 L Refrigerant pressure sensor [Engine is running] 
  • Warm-up condition
  • Both A/C switch and blower switch: ON (Compressor operates.)
 1.0 - 4.0V
73 BR/W Engine coolant temperature sensor [Engine is running]  Approximately 0 - 4.8V Output voltage varies with engine coolant temperature.
74 R/L Heated oxygen sensor 2 [Engine is running] 
  • Revving engine from idle up 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
78 B Sensor ground
(Heated oxygen sensor)		 [Engine is running] 
  • Warm-up condition
  • Idle speed
 Approximately 0V
82 B/Y Sensor ground
(Accelerator pedal position sensor 1)		 [Engine is running] 
  • Warm-up condition
  • Idle speed
 Approximately 0V
83 G Sensor ground
(Accelerator pedal position sensor 2)		 [Engine is running] 
  • Warm-up condition
  • Idle speed
 Approximately 0V
84 PU Electrical load signal
(Headlamp signal)		 [Lighting switch: ON] 
  • Lighting switch: 2nd position
 BATTERY VOLTAGE (11 - 14V)
[Lighting switch: ON] 
  • Lighting switch: OFF
 Approximately 0V
85 LG DATA link connector [Ignition switch: ON] 
  • CONSULT-II or GST: Disconnected.
 BATTERY VOLTAGE (11 - 14V)
86 Y CAN communication line [Ignition switch: ON]  Approximately 2.3V
89 LG/B Cooling fan relay-2 (High) [Engine is running] 
  • Cooling fan: Not operating
 BATTERY VOLTAGE (11 - 14V)
[Engine is running] 
  • Cooling fan: High speed operating
 0 - 1.0V
90 R Sensor power supply
(Accelerator pedal position sensor 1)		 [Ignition switch: ON]  Approximately 5V
91 R/G Sensor power supply
(Accelerator pedal position sensor 2)		 [Ignition switch: ON]  Approximately 5V
93 L/W Electrical load signal (Rear window defogger signal) [Ignition switch: ON] 
  • Rear window defogger switch: ON
 BATTERY VOLTAGE (11 - 14V)
[Ignition switch: ON] 
  • Rear window defogger switch: OFF
 Approximately 0V
94 L CAN communication line [Ignition switch: ON]  Approximately 2.8V
96 Y/G Electrical load signal
(Heater fan signal)		 [Engine is running] 
  • Heater fan switch: ON
 Approximately 0V
[Engine is running] 
  • Heater fan switch: OFF
 Approximately 5V
97 LG/R Cooling fan relay-1 (Low) [Ignition switch: ON] 
  • Cooling fan: Not operating
 BATTERY VOLTAGE (11 - 14V)
[Ignition switch: ON] 
  • Cooling fan: Operating
 0 - 1.0V
98 R/B Accelerator pedal position sensor 2 [Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully released
 0.28 - 0.48V
[Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully depressed
 More than 2.0V
99 W/R 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
101 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)
102 G/OR PNP switch [Ignition switch: ON] 
  • Gear position: P or N
 Approximately 0V
[Ignition switch: ON] 
  • Except the above gear position
 A/T models 
BATTERY VOLTAGE (11 - 14V)
M/T models 
Approximately 5V
104 P Throttle control motor relay [Ignition switch: OFF]  BATTERY VOLTAGE (11 - 14V)
[Ignition switch: ON]  0 - 1.0V
106 W Accelerator pedal position sensor 1 [Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully released
 0.65 - 0.87V
[Ignition switch: ON] 
  • Engine stopped
  • Accelerator pedal: Fully depressed
 More than 4.3V
107 OR Fuel tank temperature sensor [Engine is running]  Approximately 0 - 4.8V Output voltage varies with fuel tank temperature.
108 P/L ASCD brake switch [Ignition switch: ON] 
  • Brake pedal: Slightly depressed (A/T)
  • Clutch pedal and/or brake pedal: Slightly depressed (M/T)
 Approximately 0V
[Ignition switch: ON] 
  • Brake pedal: Fully released (A/T)
  • Clutch pedal and brake pedal: Fully released (M/T)
 BATTERY VOLTAGE (11 - 14V)
109 B/R Ignition switch [Ignition switch: OFF]  0V
[Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
111 W/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)
113 B/P 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)
115
116		 B
B		 ECM ground [Engine is running] 
  • Idle speed
 Body ground
117 L/Y EVAP canister vent control valve [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
119
120		 R/G
R/G		 Power supply for ECM [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
121 W/L Power supply for ECM (Back-up) [Ignition switch: OFF]  BATTERY VOLTAGE (11 - 14V)
(1) Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
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