User Manual - Page 550

For 2002 NISSAN MAXIMA.

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PBIB0145E
Component Description
NFEC1333
Electric Throttle Control Actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds
to the throttle valve movement.
The throttle position sensor has the two sensors. These sensors
are a kind of potentiometers which transform the throttle valve
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the throttle valve and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the throttle valve from
these signals and the ECM controls the throttle control motor to
make the throttle valve opening angle properly in response to driv-
ing condition.
CONSULT-II Reference Value in Data Monitor
Mode
NFEC1334
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
THRTL SEN2
I Ignition switch:
ON (Engine stopped)
I Shift lever:
D (A/T model)
1st (M/T model)
Accelerator pedal: Fully released
More than 0.36V
Accelerator pedal: Fully depressed Less than 4.75V
On Board Diagnosis Logic
NFEC1455
These self-diagnoses have the one trip detection logic.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P1223
1223
Throttle position sen-
sor 2 circuit low input
An excessively low voltage from the TP sensor 2
is sent to ECM.
I Harness or connectors
(The TP sensor 2 circuit is open or
shorted.)
I Electric throttle control actuator (TP
sensor 2)
P1224
1224
Throttle position sen-
sor 2 circuit high
input
An excessively high voltage from the TP sensor 2
is sent to ECM.
FAIL-SAFE MODE
NFEC1455S01
When the malfunction is detected, ECM enters in fail-safe mode and the MIL lights up.
Engine operation condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within
+10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10 degrees.
So, the acceleration will be poor.
DTC P1223, P1224 TP SENSOR
Component Description
EC-550
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