display INFINITI FX35 2005 Service Manual

DTC P1572 ASCD BRAKE SWITCH EC-597
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Revision: 2005 July 2005 FX
DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionABS006WJ
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-36, "
AUTOMATIC SPEED CONTROL DEVICE (ASCD)"
for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeABS006WK
Specification data are reference values.
On Board Diagnosis LogicABS006WL
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:

If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-402, "
DTC P0605 ECM"

This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
PBIB1605E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ASCD brake switch)

Ignition switch: ON Brake pedal: Fully released ON
Brake pedal: Slightly
depressed OFF
BRAKE SW2
(Stop lamp switch)

Ignition switch: ON Brake pedal: Fully released OFF
Brake pedal: Slightly
depressed ON
DTC No.Trouble Diagnosis
Name DTC Detecting Condition Possible Cause
P1572
1572 ASCD brake switch A)
When the vehicle speed is above 30km/h
(19 MPH), ON signals from the stop lamp
switch and the ASCD brake switch are sent
to ECM at the same time.

Harness or connectors
(The stop lamp switch circuit is shorted.)

Harness or connectors
(The ASCD brake switch circuit is shorted.)

Stop lamp switch

ASCD brake switch

Incorrect stop lamp switch installation

Incorrect ASCD brake switch installation

ECM
B)
ASCD brake switch signal is not sent to
ECM for extremely long time while the vehi-
cle is driving

DTC P1574 ICC VEHICLE SPEED SENSOR EC-605
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Revision: 2005 July 2005 FX
DTC P1574 ICC VEHICLE SPEED SENSORPFP:31036
Component DescriptionABS007ZD
The ECM receives two vehicle speed signals via CAN communication line. One is sent from “unified meter and
A/C amp.”, and the other is from TCM (Transmission control module). The ECM uses these signals for ICC
control. Refer to ACS-6, "
DESCRIPTION" for ICC functions.
On Board Diagnosis LogicABS007ZE

This self-diagnosis has the one trip detection logic.

The MIL will not light up for this self-diagnosis.
NOTE:

If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-171
.

If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500.
Refer to EC-391
.

If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-402
.
DTC Confirmation ProcedureABS007ZF
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Step 3 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Drive the vehicle at more than 40 km/h (25MPH).
4. If DTC is detected, go to EC-606, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble Diagnosis
Name DTC Detecting Condition Possible Cause
P1574
1574 ICC vehicle speed
sensor ECM detects a difference between two vehicle
speed signals is out of the specified range.

Harness or connectors
(The CAN communication line is open or
shorted.)

Unified meter and A/C amp.

ABS actuator and electric unit (control unit)

Wheel sensor

TCM

ECM
SEF058Y

DTC P1574 ASCD VEHICLE SPEED SENSOR EC-607
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Revision: 2005 July 2005 FX
DTC P1574 ASCD VEHICLE SPEED SENSORPFP:31036
Component DescriptionABS006WQ
The ECM receives two vehicle speed signals via CAN communication line. One is sent from “unified meter and
A/C amp.”, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to EC-36, "
AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for ASCD functions.
On Board Diagnosis LogicABS006WR
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:

If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-171
.

If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500.
Refer to EC-391

If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-402
DTC Confirmation ProcedureABS006WS
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Step 3 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Drive the vehicle at more than 40 km/h (25 MPH).
4. If DTC is detected, go to EC-608, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble Diagnosis
Name DTC Detecting Condition Possible Cause
P1574
1574 ASCD vehicle speed
sensor ECM detects a difference between two vehicle
speed signals is out of the specified range.

Harness or connectors
(The CAN communication line is open or
shorted.)

Unified meter and A/C amp.

ABS actuator and electric unit (control unit)

Wheel sensor

TCM

ECM
SEF058Y

DTC P2122, P2123 APP SENSOR EC-619
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Revision: 2005 July 2005 FX
DTC P2122, P2123 APP SENSORPFP:18002
Component DescriptionABS006X8
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from
these signals and controls the throttle control motor based on these
signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-
ation such as fuel cut.
CONSULT-II Reference Value in Data Monitor ModeABS006X9
Specification data are reference values.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage.
On Board Diagnosis LogicABS006XA
These self-diagnoses have the one trip detection logic.
NOTE:
If DTC P2122 or P2123 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229.
Refer to EC-483, "
DTC P1229 SENSOR POWER SUPPLY" .
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
PBIB1741E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL SEN1

Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.0 - 4.8V
ACCEL SEN2*

Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.3 - 1.2V
Accelerator pedal: Fully depressed 3.9 - 4.8V
CLSD THL POS

Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released ON
Accelerator pedal: Slightly depressed OFF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2122
2122 Accelerator pedal posi-
tion sensor 1 circuit low
input An excessively low voltage from the APP sen-
sor 1 is sent to ECM.

Harness or connectors
(The APP sensor 1 circuit is open or
shorted.)

Accelerator pedal position sensor
(Accelerator pedal position sensor 1)
P2123
2123 Accelerator pedal posi-
tion sensor 1 circuit high
input An excessively high voltage from the APP sen-
sor 1 is sent to ECM.
Engine operating 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 the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.

EC-640
[VQ35DE]
DTC P2138 APP SENSOR
Revision: 2005 July 2005 FX
DTC P2138 APP SENSORPFP:18002
Component DescriptionABS006XW
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from
these signals and controls the throttle control motor based on these
signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-
ation such as fuel cut.
CONSULT-II Reference Value in Data Monitor ModeABS006XX
Specification data are reference values.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage.
On Board Diagnosis LogicABS006XY
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P2138 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229. Refer to
EC-483, "
DTC P1229 SENSOR POWER SUPPLY" .
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
PBIB1741E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL SEN1

Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.0 - 4.8V
ACCEL SEN2*

Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.3 - 1.2V
Accelerator pedal: Fully depressed 3.9 - 4.8V
CLSD THL POS

Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released ON
Accelerator pedal: Slightly depressed OFF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2138
2138 Accelerator pedal posi-
tion sensor circuit
range/performance
problem Rationally incorrect voltage is sent to ECM
compared with the signals from APP sensor 1
and APP sensor 2.

Harness or connector
(The APP sensor 1 and 2 circuit is open
or shorted.)
(TP sensor circuit is shorted.)

Accelerator pedal position sensor 1 and
2

Electric throttle control actuator
(TP sensor 1 and 2)
Engine operating 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 the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.

ASCD INDICATOR EC-697
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Revision: 2005 July 2005 FX
Diagnostic ProcedureABS006Z5
1. CHECK OVERALL FUNCTION
Check ASCD indicator under the following conditions.
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
2. CHECK DTC
Check that DTC U1000 or U1001 is not displayed.
OK or NG
OK >> GO TO 3.
NG >> Perform trouble diagnoses for DTC U1000, U1001. Refer to EC-171, "
DTC U1000, U1001 CAN
COMMUNICATION LINE" .
3. CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
Refer to DI-32, "
SELF-DIAGNOSTIC RESULTS" .
OK or NG
OK >> GO TO 4.
NG >> Go to DI-34, "
DTC [B2202] Meter Communication Circuit" .
4. CHECK INTERMITTENT INCIDENT
Refer to EC-163, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
ASCD INDICATOR CONDITION SPECIFICATION
CRUISE LAMP

Ignition switch: ON
MAIN switch: pressed at the 1st
time → at the 2nd time ON
→ OFF
SET LAMP

MAIN switch: ON

When vehicle speed is
between 40km/h (25MPH)
and 144km/h (89MPH) ASCD: Operating ON
ASCD: Not operating OFF

EC-698
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SNOW MODE SWITCH
Revision: 2005 July 2005 FX
SNOW MODE SWITCHPFP:25310
DescriptionABS00A2B
NOTE:
If DTC U1000 or U1001 are displayed, first perform the trouble diagnosis for DTC U1000, U1001.
Refer to EC-171, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
The snow mode switch signal is sent to the “unified meter and A/C amp.” from the snow mode switch. The
“unified meter and A/C amp.” then sends the signal to the ECM by CAN communication line.
The snow mode is used for driving or starting the vehicle on snowy roads or slippery areas. If the snow mode
is activated, the vehicle speed will not be accelerated immediately than your original pedal in due to avoid the
vehicle slip. In other words, ECM controls the rapid engine torque change by controlling the electric throttle
control actuator operating speed.
CONSULT-II Reference Value in the Data Monitor ModeABS00A2C
MONITOR ITEM CONDITION SPECIFICATION
SNOW MODE SW

Ignition switch: ON SNOW MODE SW: ON ON
SNOW MODE SW: OFF OFF

INDEX FOR DTC EC-707
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Revision: 2005 July 2005 FX
[VK45DE]INDEX FOR DTCPFP:00024
DTC No. IndexABS00E3V
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-862, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
DTC*1
Items
(CONSULT-II screen terms) Reference page
CONSULT-II
GST*
2ECM*3
No DTC Flashing*4NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED. EC-761
U1000
1000*5CAN COMM CIRCUIT EC-862
U1001
1001*5CAN COMM CIRCUIT EC-862
P0000 0000 NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED. —
P0011 0011 INT/V TIM CONT-B1 EC-865
P0021 0021 INT/V TIM CONT-B2 EC-865
P0031 0031 HO2S1 HTR (B1)EC-877
P0032 0032 HO2S1 HTR (B1)EC-877
P0037 0037 HO2S2 HTR (B1)EC-885
P0038 0038 HO2S2 HTR (B1)EC-885
P0051 0051 HO2S1 HTR (B2)EC-877
P0052 0052 HO2S1 HTR (B2)EC-877
P0057 0057 HO2S2 HTR (B2)EC-885
P0058 0058 HO2S2 HTR (B2)EC-885
P0101 0101 MAF SEN/CIRCUITEC-893
P0102 0102 MAF SEN/CIRCUITEC-902
P0103 0103 MAF SEN/CIRCUITEC-902
P0112 0112 IAT SEN/CIRCUITEC-909
P0113 0113 IAT SEN/CIRCUITEC-909
P0117 0117 ECT SEN/CIRCUITEC-914
P0118 0118 ECT SEN/CIRCUITEC-914
P0122 0122 TP SEN2/CIRC EC-920
P0123 0123 TP SEN2/CIRCEC-920
P0125 0125 ECT SENSOREC-927
P0127 0127 IAT SENSOREC-930
P0128 0128 THERMSTAT FNCTNEC-933
P0132 0132 HO2S1 (B1)EC-935
P0133 0133 HO2S1 (B1)EC-944
P0134 0134 HO2S1 (B1)EC-956
P0138 0138 HO2S2 (B1)EC-966
P0139 0139 HO2S2 (B1)EC-975
P0152 0152 HO2S1 (B2)EC-935
P0153 0153 HO2S1 (B2)EC-944
P0154 0154 HO2S1 (B2)EC-956

INDEX FOR DTC EC-711
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Revision: 2005 July 2005 FX
Alphabetical IndexABS00E3W
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-862, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
Items
(CONSULT-II screen terms) DTC*
1
Reference page
CONSULT-II
GST*
2ECM*3
A/T INTERLOCK P1730 1730 AT-145
A/T TCC S/V FNCTN P0744 0744AT-127
ACC COMMAND VALUE*7P1568 1568EC-1261
APP SEN 1/CIRC P2122 2122 EC-1302
APP SEN 1/CIRC P2123 2123EC-1302
APP SEN 2/CIRC P2127 2127EC-1309
APP SEN 2/CIRC P2128 2128EC-1309
APP SENSOR P2138 2138EC-1323
ASCD BRAKE SW P1572 1572 EC-1262 (Models with ICC)
EC-1271
(Models with ASCD)
ASCD SW P1564 1564 EC-1247
(Models with ICC)
EC-1254
(Models with ASCD)
ASCD VHL SPD SEN P1574 1574 EC-1279
(Models with ICC)
EC-1281
(Models with ASCD)
ATF TEMP SEN/CIRC P0710 0710 AT-136
BRAKE SW/CIRCUIT P1805 1805EC-1297
CAN COMM CIRCUIT U1000
1000*5EC-862
CAN COMM CIRCUIT U1001
1001*5EC-862
CKP SEN/CIRCUIT P0335 0335 EC-1036
CLOSED LOOP-B1 P1148 1148EC-1209
CLOSED LOOP-B2 P1168 1168EC-1209
CMP SEN/CIRC-B1 P0340 0340EC-1043
CTP LEARNING P1225 1225EC-1225
CTP LEARNING P1226 1226EC-1227
CYL 1 MISFIRE P0301 0301EC-1022
CYL 2 MISFIRE P0302 0302EC-1022
CYL 3 MISFIRE P0303 0303EC-1022
CYL 4 MISFIRE P0304 0304EC-1022
CYL 5 MISFIRE P0305 0305EC-1022
CYL 6 MISFIRE P0306 0306EC-1022
CYL 7 MISFIRE P0307 0307EC-1022
CYL 8 MISFIRE P0308 0308EC-1022
D/C SOLENOID FNCTN P1764 1764 AT-160
D/C SOLENOID/CIRC P1762 1762AT-158
ECM P0605 0605EC-1134
ECM BACK UP/CIRCUIT P1065 1065EC-1137
ECT SEN/CIRCUIT P0117 0117 EC-914
ECT SEN/CIRCUIT P0118 0118EC-914
ECT SENSOR P0125 0125EC-927

PRECAUTIONS EC-717
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Revision: 2005 July 2005 FX

After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Overall Function
Check should be a good result if the repair is completed.

When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.

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.

B1 indicates the bank 1, B2 indicates the bank 2 as shown
in the figure.
SEF217U
SEF348N
PBIB1144E