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Home >> Infiniti >> 2007 >> QX56 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction >> 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-II.

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)
1 B ECM ground [Engine is running] 
  • Idle speed
 Body ground
2 LG/B A/F sensor 1 heater (bank 1) [Engine is running] 
  • Warm-up condition 
  • Idle speed (More than 140 seconds after starting engine)
G05228465Courtesy of NISSAN NORTH AMERICA, INC.
3 L Throttle control motor relay power supply [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
4 L/W Throttle control motor (Close) [Ignition switch: ON] 
  • Engine: Stopped
  • Selector lever: D
  • Accelerator pedal: Fully released
G04900086Courtesy of NISSAN NORTH AMERICA, INC.
5 L/B Throttle control motor (Open) [Ignition switch: ON] 
  • Engine: Stopped
  • Selector lever: D
  • Accelerator pedal: Fully depressed
G04900087Courtesy of NISSAN NORTH AMERICA, INC.
6 GR 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
 0 - 1.0V
[Ignition switch: ON] 
  • Engine: Stopped

[Engine is running] 
  • Engine speed: Above 3, 600 rpm
 BATTERY VOLTAGE (11 - 14V)
10 W Intake valve timing control solenoid valve (bank 1) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 BATTERY VOLTAGE (11 - 14V)
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000rpm
G04900088Courtesy of NISSAN NORTH AMERICA, INC.
11 LG Intake valve timing control solenoid valve (bank 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 BATTERY VOLTAGE (11 - 14V)
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000rpm
G04900088Courtesy of NISSAN NORTH AMERICA, INC.
12 R Power steering pressure sensor [Engine is running] 
  • Steering wheel: Being turned
 0.5 - 4.5V
[Engine is running] 
  • Steering wheel: Not being turned
 0.4 - 0.8V
13 O Crankshaft position sensor (POS) [Engine is running] 
  • Warm-up condition 
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle
G04900090Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Engine speed: 2, 000 rpm
G04900091Courtesy of NISSAN NORTH AMERICA, INC.
14 Y Camshaft position sensor (PHASE) [Engine is running] 
  • Warm-up condition 
  • Idle speed
NOTE: The pulse cycle changes depending on rpm at idle
G04900092Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Engine speed: 2, 000 rpm
G04900093Courtesy of NISSAN NORTH AMERICA, INC.
15 W Knock sensor (bank 1) [Engine is running] 
  • Idle speed
 Approximately 2.5V
16 G/L 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.
21
22
23
44		 O/L
BR
GR/W
O		 Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 7		 [Engine is running] 
  • Warm-up condition 
  • Idle speed
    NOTE: The pulse cycle changes depending on rpm at idle
G04900094Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 rpm
G04900095Courtesy of NISSAN NORTH AMERICA, INC.
24
43		 GR/G
GR/G		 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 NORTH AMERICA, INC.
25 O/G 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 and 4, 000 rpm for 1 minute and at idle for 1 minute under no 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 R/B Intake air temperature sensor [Engine is running]  Approximately 0 - 4.8V Output voltage varies with intake air temperature.
35 BR/R 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.
36 W Knock sensor (bank 2) [Engine is running] 
  • Idle speed
 Approximately 2.5V
40
41
42
63		 Y/G
P
L
G		 Fuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2
Fuel injector No. 8		 [Engine is running] 
  • Warm-up condition 
  • Idle speed
    NOTE: The pulse cycle changes depending on rpm at idle
G04900094Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 000 rpm
G04900095Courtesy of NISSAN NORTH AMERICA, INC.
45 L/Y EVAP canister purge volume control solenoid valve [Engine is running] 
  • Idle speed
  • Accelerator pedal: Not depressed even slightly, after engine starting
G04900099Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Engine speed: About 2, 000 rpm (More than 100 seconds after starting engine)
G04900100Courtesy of NISSAN NORTH AMERICA, INC.
47 Y Sensor power supply (Throttle position sensor) [Ignition switch: ON]  Approximately 5V
48 SB 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 B Throttle position sensor 1 [Ignition switch: ON] 
  • Engine: Stopped
  • Selector lever: D
  • Accelerator pedal: Fully released
 More than 0.36V
[Ignition switch: ON] 
  • Engine: Stopped
  • Selector lever: D
  • Accelerator pedal: Fully depressed
 Less than 4.75V
51 W Mass air flow sensor [Engine is running] 
  • Warm-up condition 
  • Idle speed
 1.0 - 1.3V
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 rpm
 1.7 - 2.1V
55 R 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
56 BR/G A/F sensor 1 (bank 1) [Ignition switch: ON]  Approximately 2.2V
46
60
61
62		 L/R
GR/R
O/W
Y/R		 Ignition signal No. 7
Ignition signal No. 5
Ignition signal No. 3
Ignition signal No. 1		 [Engine is running] 
  • Warm-up condition 
  • Idle speed
    NOTE: The pulse cycle changes depending on rpm at idle
G04900101Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 rpm
G04900102Courtesy of NISSAN NORTH AMERICA, INC.
66 R Sensor ground (Throttle position sensor) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
67 B Sensor ground [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
68 W/L Sensor power supply (PSP sensor) [Ignition switch: ON]  Approximately 5V
69 W Throttle position sensor 2 [Ignition switch: ON] 
  • Engine: Stopped
  • Selector lever: D
  • Accelerator pedal: Fully released
 Less than 4.75V
[Ignition switch: ON] 
  • Engine: Stopped
  • Selector lever: D
  • Accelerator pedal: Fully depressed
 More than 0.36V
70 B/W Refrigerant pressure sensor [Engine is running] 
  • Warm-up condition 
  • Both A/C switch and blower switch: ON (Compressor operates.)
 1.0 - 4.0V
71 R Battery current sensor [Engine is running] 
  • Battery: Fully charged(1)
  • Idle speed
 Approximately 2.6 - 3.5V
73 Y/B Engine coolant temperature sensor [Engine is running]  Approximately 0 - 4.8V Output voltage varies with engine coolant temperature.
74 L 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
75 L/P A/F sensor 1 (bank 2) [Ignition switch: ON]  Approximately 2.2V
78 B/W Sensor ground (Heated oxygen sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
65
79
80
81		 G/R
V/W
W/R
W/G		 Ignition signal No. 8
Ignition signal No. 6
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
G04900101Courtesy of NISSAN NORTH AMERICA, INC.
[Engine is running] 
  • Warm-up condition 
  • Engine speed: 2, 500 rpm
G04900102Courtesy of NISSAN NORTH AMERICA, INC.
82 B/R Sensor ground (APP sensor 1) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
83 G/W Sensor ground (APP sensor 2) [Engine is running] 
  • Warm-up condition 
  • Idle speed
 Approximately 0V
85 G/W Data link connector [Ignition switch: ON] 
  • CONSULT-II or GST: Disconnected
 Approximately 5V - Battery voltage (11 - 14V)
86 P CAN communication line [Ignition switch: ON]  Approximately 1.1 - 2.3V Output voltage varies with the communication status
90 L Sensor power supply (APP sensor 1) [Ignition switch: ON]  Approximately 5V
91 W/R Sensor power supply (APP sensor 2) [Ignition switch: ON]  Approximately 5V
94 L CAN communication line [Ignition switch: ON]  Approximately 2.6 - 3.2V Output voltage varies with the communication status.
98 G/R Accelerator pedal position sensor 2 [Ignition switch: ON] 
  • Engine: Stopped
  • Accelerator pedal: Fully released
 0.25 - 0.50V
[Ignition switch: ON] 
  • Engine: Stopped
  • Accelerator pedal: Fully depressed
 2.0 - 2.5V
99 G/Y ASCD steering switch (Models with ICC system) [Ignition switch: ON] 
  • ICC steering switch: OFF
 Approximately 4.3V
[Ignition switch: ON] 
  • MAIN switch: Pressed
 Approximately 0V
[Ignition switch: ON] 
  • CANCEL switch: Pressed
 Approximately 1.3V
[Ignition switch: ON] 
  • RESUME/ACCELERATE switch: Pressed
 Approximately 3.7V
[Ignition switch: ON] 
  • SET/COAST switch: Pressed
 Approximately 3V
[Ignition switch: ON] 
  • DISTANCE switch: Pressed
 Approximately 2.2V
99 G/Y ASCD steering switch (Models with ASCD system) [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/W Stop lamp switch [Ignition switch: OFF] 
  • Brake pedal: Fully released
 Approximately 0V
[Ignition switch: OFF] 
  • Brake pedal: Slightly depressed
 BATTERY VOLTAGE (11 - 14V)
102 GR/R PNP switch [Ignition switch: ON] 
  • Selector lever: P or N
 Approximately 0V
[Ignition switch: ON] 
  • Except the above gear position
 BATTERY VOLTAGE (11 - 14V)
104 O Throttle control motor relay [Ignition switch: OFF]  BATTERY VOLTAGE (11 - 14V)
[Ignition switch: ON]  0 - 1.0V
106 BR/W Accelerator pedal position sensor 1 [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
107 V/R Fuel tank temperature sensor [Engine is running]  Approximately 0 - 4.8V Output voltage varies with fuel tank temperature.
108 BR/W ICC brake switch (Models with ICC system)
ASCD brake switch (Models with ASCD system)		 [Ignition switch: ON] 
  • Brake pedal: Slightly depressed
 Approximately 0V
[Ignition switch: ON] 
  • Brake pedal: Fully released
 BATTERY VOLTAGE (11 - 14V)
109 L/W Ignition switch [Ignition switch: OFF]  0V
[Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
111 W/B ECM relay (Self shut-off) [Engine is running] 
[Ignition switch: OFF] 
  • For a few seconds after turning ignition switch OFF
 0 - 1.5V
[Ignition switch: OFF] 
  • More than a few seconds after turning ignition switch OFF
 BATTERY VOLTAGE (11 - 14V)
113 GR Fuel pump relay [Ignition switch: ON] 
  • For 1 second after turning ignition switch ON

[Engine is running] 		 0 - 1.5V
[Ignition switch: ON] 
  • More than 1 second after turning ignition switch ON
 BATTERY VOLTAGE (11 - 14V)
115
116		 B
B/W		 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		 BR
BR		 Power supply for ECM [Ignition switch: ON]  BATTERY VOLTAGE (11 - 14V)
121 W Power supply for ECM (Back-up) [Ignition switch: OFF]  BATTERY VOLTAGE (11 - 14V)
*: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
(1) Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to BATTERY .
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