2007 INFINITI FX35 ignition

DTC P1421 COLD START CONTROL EC-1189
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Revision: 2006 July 2007 FX35/FX45
DTC P1421 COLD START CONTROLPFP:23710
DescriptionNBS006S1
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.
On Board Diagnosis LogicNBS006S2
DTC Confirmation ProcedureNBS006S3
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.

If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-II.
4. Check that the “COOLAN TEMP/S” indication is between 4 °C
(39 °F) and 36 °C (97 °F).
If “COOLAN TEMP/S” indication is within the specified value, go
to the following step.
If “COOLANT TEMP/S” indication is out of the specified value,
cool engine down or warm engine up and go to step 1.
5. Start engine and let it idle for 5 minutes.
6. If 1st trip DTC is detected, go to EC-1189, "
Diagnostic Proce-
dure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureNBS006S4
1. PERFORM IDLE AIR VOLUME LEARNING
Perform EC-745, "
Idle Air Volume Learning" .
Is Idle Air Volume Learning carried out successfully?
Ye s o r N o
Ye s > > G O T O 2 .
No >> Follow the instruction of Idle Air Volume Learning.
2. CHECK INTAKE SYSTEM
Check for the cause of intake air volume lacking. Refer to the following.

Crushed intake air passage

Intake air passage clogging
OK or NG
OK >> GO TO 3.
NG >> Repair or replace malfunctioning part
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1421
1421 Cold start emission reduction
strategy monitoring ECM does not control ignition timing and engine
idle speed properly when engine is started with
prewarming up condition.

Lack of intake air volume

Fuel injection system

ECM
SEF174Y

EC-1190
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DTC P1421 COLD START CONTROL
Revision: 2006 July 2007 FX35/FX45
3. CHECK FUEL INJECTION SYSTEM FUNCTION
Perform EC-976, "
DTC Confirmation Procedure" in DTC P0171, P0174 FUEL INJECTION SYSTEM FUNC-
TION.
OK or NG
OK >> GO TO 4.
NG >> Go to EC-982, "
Diagnostic Procedure" .
4. PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-II
1. Turn ignition switch ON.
2. Select “SELF DIAG RESULTS” mode with CONSULT-II.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-1189, "
DTC Confirmation Procedure"
5. Is the 1st trip DTC P1421 displayed again?
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3. Perform DTC Confirmation Procedure.
See EC-1189, "
DTC Confirmation Procedure" .
4. Is the 1st trip DTC P1421 displayed again?
Ye s o r N o
Yes >> GO TO 5.
No >> INSPECTION END
5. REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to BL-207, "
ECM Re-Communicating Function" .
3. Perform EC-744, "
VIN Registration" .
4. Perform EC-745, "
Accelerator Pedal Released Position Learning" .
5. Perform EC-745, "
Throttle Valve Closed Position Learning" .
6. Perform EC-745, "
Idle Air Volume Learning" .
>> INSPECTION END

DTC P1564 ICC STEERING SWITCH EC-1191
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Revision: 2006 July 2007 FX35/FX45
DTC P1564 ICC STEERING SWITCHPFP:25551
Component DescriptionNBS004DT
ICC steering switch has variant values of electrical resistance for each button. ECM reads voltage variation of
switch, and determines which button is operated.
Refer to ACS-6, "
DESCRIPTION" for the ICC function.
CONSULT-II Reference Value in Data Monitor ModeNBS004DU
Specification data are reference values.
On Board Diagnosis LogicNBS004DV
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis .
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to
EC-1148
.
1. ICC steering switch 2. MAIN switch 3. DISTANCE switch
4. CANCEL switch 5. SET/COAST switch 6. RESUME/ACCELERATE switch
PBIB3241E
MONITOR ITEM CONDITION SPECIFICATION
MAIN SW

Ignition switch: ON MAIN switch: Pressed ON
MAIN switch: Released OFF
CANCEL SW

Ignition switch: ON CANCEL switch: Pressed ON
CANCEL switch: Released OFF
RESUME/ACC SW

Ignition switch: ON RESUME/ACCELERATE switch:
Pressed ON
RESUME/ACCELERATE switch:
Released OFF
SET SW

Ignition switch: ON SET/COAST switch: Pressed ON
SET/COAST switch: Released OFF
DIST SW

Ignition switch: ON DISTANCE switch: Pressed ON
DISTANCE switch: Released OFF
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
P1564
1564 ICC steering switch

An excessively high voltage signal from the
ICC steering switch is sent to ECM.

ECM detects that input signal from the ICC
steering switch is out of the specified range.

ECM detects that the ICC steering switch is
stuck ON.

Harness or connectors
(The switch circuit is open or shorted.)

ICC steering switch

ECM

EC-1192
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DTC P1564 ICC STEERING SWITCH
Revision: 2006 July 2007 FX35/FX45
DTC Confirmation ProcedureNBS004DW
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.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 10 seconds.
4. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
5. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.
6. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 seconds.
7. Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.
8. Press DISTANCE switch for at least 10 seconds, then release it and wait at least 10 seconds.
9. If DTC is detected, go to EC-1194, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
SEF058Y

EC-1194
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DTC P1564 ICC STEERING SWITCH
Revision: 2006 July 2007 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureNBS004DY
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to EC-819, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
82 B/W Sensor ground [Engine is running]

Warm-up condition

Idle speed Approximately 0V
99 G/Y ICC steering switch [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
PBIB2195E

DTC P1564 ICC STEERING SWITCH EC-1195
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Revision: 2006 July 2007 FX35/FX45
2. CHECK ICC STEERING SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch ON.
2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW”, “SET SW” and “DIST SW” in “DATA MONITOR” mode with CON-
SULT-II.
3. Check each item indication under the following conditions.
Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 99 and ground with press- ing each button.
OK or NG
OK >> GO TO 8.
NG >> GO TO 3.
Switch Monitor item Condition Indication
MAIN switch MAIN SW Pressed ON
Released OFF
CANCEL switch CANCEL SW Pressed ON
Released OFF
RESUME/ACCEL-
ERATE switch RESUME/ACC SW Pressed ON
Released OFF
SET/COAST switch SET SW Pressed ON
Released OFF
DISTANCE switch DIST SW Pressed ON
Released OFF
MBIB0064E
Switch Condition Voltage [V]
MAIN switch Pressed Approx. 0
Released Approx. 4.3
CANCEL switch Pressed Approx. 1.3
Released Approx. 4.3
RESUME/ACCELER-
ATE switch Pressed Approx. 3.7
Released Approx. 4.3
SET/COAST switch Pressed Approx. 3.0
Released Approx. 4.3
DISTANCE switch Pressed Approx. 2.2
Released Approx. 4.3
PBIB0311E

EC-1196
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DTC P1564 ICC STEERING SWITCH
Revision: 2006 July 2007 FX35/FX45
3. CHECK ICC STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect combination switch harness connector M203.
4. Check harness continuity between combination switch terminal 15 and ECM terminal 82. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following.

Combination switch (spiral cable)

Harness for open and short between ECM and combination switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK ICC STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 99 and combination switch terminal 14. Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following.

Combination switch (spiral cable)

Harness for open and short between ECM and combination switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK ICC STEERING SWITCH
Refer to EC-1197, "
Component Inspection" .
OK or NG
OK >> GO TO 8.
NG >> Replace ICC steering switch.
8. CHECK INTERMITTENT INCIDENT
Refer to EC-812, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Continuity should exist.
Continuity should exist.

EC-1198
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DTC P1564 ASCD STEERING SWITCH
Revision: 2006 July 2007 FX35/FX45
DTC P1564 ASCD STEERING SWITCHPFP:25551
Component DescriptionNBS004E0
ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.
Refer to EC-697, "
AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeNBS004E1
Specification data are reference values.
On Board Diagnosis LogicNBS004E2
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis .
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to
EC-1148
.
1. ASCD steering switch 2. MAIN switch 3. DISTANCE switch
(ICC models only)
4. CANCEL switch 5. SET/COAST switch 6. RESUME/ACCELERATE switch
PBIB3241E
MONITOR ITEM CONDITION SPECIFICATION
MAIN SW

Ignition switch: ON MAIN switch: Pressed ON
MAIN switch: Released OFF
CANCEL SW

Ignition switch: ON CANCEL switch: Pressed ON
CANCEL switch: Released OFF
RESUME/ACC SW

Ignition switch: ON RESUME/ACCELERATE switch:
Pressed ON
RESUME/ACCELERATE switch:
Released OFF
SET SW

Ignition switch: ON SET/COAST switch: Pressed ON
SET/COAST switch: Released OFF
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
P1564
1564 ASCD steering
switch

An excessively high voltage signal from the ASCD
steering switch is sent to ECM.

ECM detects that input signal from the ASCD
steering switch is out of the specified range.

ECM detects that the ASCD steering switch is
stuck ON.

Harness or connectors
(The switch circuit is open or shorted.)

ASCD steering switch

ECM