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Home >> Nissan-Datsun >> 2007 >> Altima Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) (Except For CALIFORNIA) >> Ecu Diagnosis >> ECM >> Reference Value >> Physical Values
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Physical Values

NOTE:
  • ECM is located behind the passenger side instrument lower panel. For this inspection, remove passenger side instrument lower panel.
  • 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.
TERMINALS VOLTAGE SPECIFICATION

Terminal No. Wire color Description Condition Value (Approx.)
+ - Signal name Input/ Output
2 Ground G/W Throttle control motor relay power supply Input [Ignition switch: ON] BATTERY VOLTAGE (11-14V)
4 Ground BR/Y A/F sensor 1 heater Output [Engine is running]
  • Warm-up condition
  • Idle speed
G04886955
5 Ground L Throttle control motor (Open) Output [Ignition switch: ON]
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/ T)
  • Accelerator pedal: Fully depressed
G04886956
6 Ground P Throttle control motor (Close) Output [Ignition switch: ON]
  • Engine stopped
  • Shift lever: D (CVT), 1st (M/ T)
  • Accelerator pedal: Fully released
G04886957
9
10
11
21		 Ground L/B
G/R
Y/R
G/Y		 Ignition signal No. 3
Ignition signal No. 2
Ignition signal No. 1
Ignition signal No. 4		 Output [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle
G04886958
[Engine is running]
  • Warm-up condition
  • Engine speed: 2, 000 RPM
G04886959
12
16		 Ground B ECM ground - [Engine is running]
  • Idle speed
 Body ground
13 Ground R 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
G04886629
[Ignition switch: ON]
  • Engine stopped

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

[Engine is running]		 0-1.0V
[Engine is running]
  • More than 1 second after turning ignition switch ON
 BATTERY VOLTAGE
(11-14V)
15 Ground O Throttle control motor relay Output [Ignition switch: ON → OFF] 0-1.0V
↓
BATTERY VOLTAGE
(11-14V)
↓
0V
[Ignition switch: ON] 0-1.0V
24 Ground W/B ECM relay (Self shut-off) Output [Engine is running]
[Ignition switch: OFF]
  • 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 Ground P/L EVAP canister purge volume control solenoid valve Output [Engine is running]
  • Idle speed
  • Accelerator pedal: Not depressed even slightly, after engine starting
G04886962
[Engine is running]
  • Engine speed: About 2, 000 RPM (More than 100 seconds after starting engine.)
G04886963
29
30
31
32		 Ground LG/R
R/Y
R/W
R/B		 Fuel injector No. 4
Fuel injector No. 3
Fuel injector No. 2
Fuel injector No. 1		 Output [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle
G04886964
[Engine is running]
  • Warm-up condition
  • Engine speed: 2, 000 RPM
G04886965
33 Ground LG 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
 0-1.0V
35 Ground B/Y Sensor ground (Heated oxygen sensor 2) - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
36 Ground B Sensor ground (Throttle position sensor) - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
37 Ground W Throttle position sensor 1 Input [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 Ground R Throttle position sensor 2 Input [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 Ground R Refrigerant pressure sensor Input [Engine is running]
  • Warm-up condition
  • Both A/C switch and blower fan motor switch: ON (Compressor operates)
 1.0-4.0V
40 Ground G Sensor ground
(Refrigerant pressure sensor)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
41 Ground O/B Power steering pressure sensor Output [Engine is running]
  • Steering wheel: Being turned
 0.5-4.0V
[Engine is running]
  • Steering wheel: Not being turned
 0.4-0.8V
42 Ground G/R Battery current sensor Input [Engine is running]
  • Battery: Fully charged(1)
  • Idle speed
 2.6-3.5V
44 Ground R/B Sensor ground
(Battery current sensor)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
45 Ground B/W A/F sensor 1 (bank 1) Input [Ignition switch: ON] 2.2V
46 Ground Y Engine coolant temperature sensor Input [Engine is running] 0-4.8V
Output voltage varies with engine coolant temperature.
47 Ground G Sensor power supply (Throttle position sensor) - [Ignition switch: ON] 5V
48 Ground B/P Sensor ground
(Power steering pressure sensor)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
49 Ground L A/F sensor 1 Input [Engine is running]
  • Warm-up condition
  • Engine speed: 2, 000 RPM
 1.8V
Output voltage varies with air fuel ratio.
50 Ground L/Y Intake air temperature sensor Input [Engine is running] 0-4.8V
Output voltage varies with intake air temperature.
51 Ground O/L Sensor power supply - [Ignition switch: ON] 5V
52 Ground LG Sensor ground
(Engine coolant temperature sensor)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
55 Ground R/L Sensor power supply
(Power steering pressure sensor)		 - [Ignition switch: ON] 5V
56 Ground G/B Sensor ground
(Mass air flow sensor, Intake air temperature sensor)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
58 Ground O Mass air flow sensor Input [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 Ground G/W Sensor power supply [Camshaft position sensor (PHASE)] - [Ignition switch: ON] 5V
60 Ground Y/B Sensor ground [Crankshaft position sensor (POS)] - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
61 Ground W Knock sensor Input [Engine is running]
  • Idle speed
 2.5V
64 Ground B/R Sensor ground
[Camshaft position sensor (PHASE)]		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
65 Ground W Crankshaft position sensor (POS) Input [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle
G04886966
[Engine is running]
  • Engine speed: 2, 000 RPM
G04886967
67 Ground - Sensor ground (Knock sensor) - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
69 Ground W/R Camshaft position sensor (PHASE) Input [Engine is running]
  • Warm-up condition
  • Idle speed
    NOTE: The pulse cycle changes depending on RPM at idle
G04886968
[Engine is running]
  • Engine speed is 2, 000 RPM
G04886969
76 Ground R/G Sensor power supply [Crankshaft position sensor (POS)] - [Ignition switch: ON] 5V
77 Ground W/L Power supply for ECM (Back-up) Input [Ignition switch: OFF] BATTERY VOLTAGE (11-14V)
78 Ground R/L Intake valve timing control solenoid valve Output [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
[Engine is running]
  • Warm-up condition
  • Engine speed: 2, 000rpm
G04886970
81 Ground W Accelerator pedal position sensor 1 Input [Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully released
 0.5-1.0V
[Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully depressed
 4.2-4.8V
82 Ground G/B Accelerator pedal position sensor 2 Input [Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully released
 0.25-0.5V
[Ignition switch: ON]
  • Engine stopped
  • Accelerator pedal: Fully depressed
 2.0-2.5V
83 Ground R/W Sensor power supply
(Accelerator pedal position sensor 1)		 - [Ignition switch: ON] 5V
84 Ground B Sensor ground
(Accelerator pedal position sensor 1)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
85 Ground G/Y ASCD steering switch Input [Ignition switch: ON]
  • ASCD steering switch: OFF
 4V
[Ignition switch: ON]
  • MAIN switch: Pressed
 0V
[Ignition switch: ON]
  • CANCEL switch: Pressed
 1V
[Ignition switch: ON]
  • RESUME/ACCELERATE switch: Pressed
 3V
[Ignition switch: ON]
  • SET/COAST switch: Pressed
 2V
86 Ground LG EVAP control system pressure sensor Input [Ignition switch: ON] 1.8-4.8V
87 Ground P/L Sensor power supply (Accelerator pedal position sensor 2) - [Ignition switch: ON] 5V
88 Ground O Data link connector Input/ Output [Ignition switch: ON]
  • CONSULT-III or GST: Disconnected
 BATTERY VOLTAGE
(11-14V)
91 Ground BR/L Sensor power supply (EVAP control system pressure sensor) - [Ignition switch: ON] 5V
92 Ground R Sensor ground (ASCD steering switch) - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
93 Ground L/Y Ignition switch Input [Ignition switch: OFF] 0V
[Ignition switch: ON] BATTERY VOLTAGE (11-14V)
95 Ground R/Y Fuel tank temperature sensor Input [Engine is running] 0-4.8V
Output voltage varies with fuel tank temperature.
96 Ground V Sensor ground
(EVAP control system pressure sensor)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
97 Ground P CAN communication line Input/Output - -
98 Ground L CAN communication line Input/Output - -
100 Ground G Sensor ground
(Accelerator pedal position sensor 2)		 - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
102 Ground R/B PNP switch Input [Ignition switch: ON]
  • Shift lever: P or N (CVT), Neutral (M/T)
 BATTERY VOLTAGE
(11-14V)
[Ignition switch: ON]
  • Shift lever: Except above
 0V
104 Ground B/W Sensor ground (Fuel tank temperature sensor) - [Engine is running]
  • Warm-up condition
  • Idle speed
 0V
105 Ground R/G Power supply for ECM Input [Ignition switch: ON] BATTERY VOLTAGE
(11-14V)
106 Ground SB Stop lamp switch Input [Ignition switch: OFF]
  • Brake pedal: Fully released
 0V
[Ignition switch: OFF]
  • Brake pedal: Slightly depressed
 BATTERY VOLTAGE
(11-14V)
107
108		 Ground B
B		 ECM ground - [Engine is running]
  • Idle speed
 Body ground
109 Ground LG EVAP canister vent control valve Output [Ignition switch: ON] BATTERY VOLTAGE
(11-14V)
110 Ground G/B ASCD brake switch Input [Ignition switch: ON]
  • Brake pedal: Slightly depressed (CVT)
  • Brake pedal and clutch pedal: Slightly depressed (M/T)
 0V
[Ignition switch: ON]
  • Brake pedal: Fully released (CVT)
  • Brake pedal and/or clutch pedal: Fully released (M/T)
 BATTERY VOLTAGE
(11-14V)
111
112		 Ground B
B		 ECM ground - [Engine is running]
  • Idle speed
 Body ground
(1) Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to "HOW TO HANDLE BATTERY ".

*: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Fig 1: Engine Control System - Wiring Diagram (1 Of 7)
G04888007
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