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EC-90Revision: August 2007
TROUBLE DIAGNOSIS
2004 QX56
BBIA0382E
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TROUBLE DIAGNOSIS
EC-91
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Revision: August 20072004 QX56
BBIA0448E
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EC-92Revision: August 2007
TROUBLE DIAGNOSIS
2004 QX56
BBIA0384E
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TROUBLE DIAGNOSIS
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Revision: August 20072004 QX56
BBIA0641E
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EC-94Revision: August 2007
TROUBLE DIAGNOSIS
2004 QX56
Circuit DiagramUBS00H02
BBWA1788E
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BBWA1994E
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EC-96Revision: August 2007
TROUBLE DIAGNOSIS
2004 QX56
ECM Harness Connector Terminal LayoutUBS00H03
ECM Terminals and Reference ValueUBS00H04
PREPARATION
1. ECM is located in the engine room passenger side behind bat-
tery.
2. Remove ECM harness connector.
3. When disconnecting ECM harness connector, loosen it with
levers as far as they will go as shown in the figure.
4. Connect a break-out box (SST) and Y-cable adapter (SST)
between the ECM and ECM harness connector.
Use extreme care not to touch 2 pins at one time.
Data is for comparison and may not be exact.
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 dam-
age to the ECMs transistor. Use a ground other than ECM terminals, such as the ground.
PBIB1192E
BBIA0386E
BBIA0387E
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
1 B ECM ground[Engine is running]
Idle speedBody ground
2O/BA/F sensor 1 heater
(bank 1)[Engine is running]
Warm-up condition
Idle speedApproximately 5V
PBIB1584E
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![INFINITI QX56 2004 Factory Service Manual TROUBLE DIAGNOSIS
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Revision: August 20072004 QX563LThrottle control motor relay
power supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4 L/W Throttle control motor INFINITI QX56 2004 Factory Service Manual TROUBLE DIAGNOSIS
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Revision: August 20072004 QX563LThrottle control motor relay
power supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4 L/W Throttle control motor](/manual-img/42/57034/w960_57034-1287.png)
TROUBLE DIAGNOSIS
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Revision: August 20072004 QX563LThrottle control motor relay
power supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4 L/W Throttle control motor (Close)[Ignition switch: ON]
Engine stopped
Shift lever position: D
Accelerator pedal: Released0 - 14V
5 L/B Throttle control motor (Open)[Ignition switch: ON]
Engine stopped
Shift lever position: D
Accelerator pedal: Fully depressed0 - 14V
6GRHeated oxygen sensor 2
heater (bank 1)[Engine is running]
Engine speed is 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 load0 - 1.0V
[Ignition switch: ON]
Engine stopped
[Engine is running]
Engine speed is above 3,600 rpm.BATTERY VOLTAGE
(11 - 14V)
12 RPower steering pressure
sensor[Engine is running]
Steering wheel is being turned.0.5 - 4.5V
[Engine is running]
Steering wheel is not being turned.0.4 - 0.8V
13 OCrankshaft position sensor
(POS)[Engine is running]
Warm-up condition
Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle.1.0 - 2.0V
[Engine is running]
Engine speed is 2,000 rpm.1.0 - 2.0V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
PBIB1104E
PBIB1105E
PBIB1041E
PBIB1042E