2006 INFINITI FX35 check engine

DTC P1845 ATF PRESSURE SWITCH 5 AT-175
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Revision: 2006 December 2006 FX35/FX45
DTC P1845 ATF PRESSURE SWITCH 5PFP:25240
DescriptionNCS001GX
Fail-safe function to detect direct clutch solenoid valve condition.
CONSULT-II Reference ValueNCS001GY
On Board Diagnosis LogicNCS001GZ

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1845 ATF PRES SW 5/CIRC” with CONSULT-II is detected when TCM detects
that actual gear ratio is normal, and relation between gear position and condition of ATF pressure switch 5
is irregular during depressing accelerator pedal. (Other than during shift change)
Possible CauseNCS001H0

ATF pressure switch 5

Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureNCS001H1
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Start engine.
2. Accelerate vehicle to maintain the following conditions. ACCELE POSI: 1.5/8 - 2.0/8
SLCT LVR POSI: “D” position
GEAR: “1”
“2” (D/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
3. Perform step “2” again.
4. Turn ignition switch OFF, then perform step “1” to “3” again.
5. Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT- II.
If DTC (P1845) is detected, go to AT- 1 7 6 , "
Diagnostic Procedure" .
If DTC (P1762) is detected, go to AT- 1 5 5 , "
Diagnostic Procedure" .
Item name Condition Display value
ATF PRES SW 5 Direct clutch engaged. Refer to
AT- 2 2
.ON
Direct clutch disengaged. Refer to AT- 2 2
.OFF
BCIA0031E

AT-176
DTC P1845 ATF PRESSURE SWITCH 5
Revision: 2006 December 2006 FX35/FX45
Diagnostic ProcedureNCS001H2
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “ECU INPUT SIGNALS” or “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Drive vehicle in the “D” position (1st
2nd gear), and confirm
the ON/OFF actuation of the “ATF PRES SW 5”.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 7 9 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check the following.

A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 9 , "Control Valve with TCM and A/T Fluid Tem-
perature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform AT- 1 7 5 , "
DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
ATF PRES SW 5 Direct clutch engaged. Refer to
AT- 2 2
.ON
Direct clutch disengaged. Refer to AT- 2 2
.OFF
PCIA0067E

DTC P1846 ATF PRESSURE SWITCH 6 AT-177
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Revision: 2006 December 2006 FX35/FX45
DTC P1846 ATF PRESSURE SWITCH 6PFP:25240
DescriptionNCS001H3
Fail-safe function to detect high and low reverse clutch solenoid valve condition.
CONSULT-II Reference ValueNCS001H4
On Board Diagnosis LogicNCS001H5

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1846 ATF PRES SW 6/CIRC” with CONSULT-II is detected when TCM detects
that actual gear ratio is normal, and relation between gear position and condition of ATF pressure switch 6
is irregular during depressing accelerator pedal. (Other than during shift change)
Possible CauseNCS001H6

ATF pressure switch 6

Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureNCS001H7
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Start engine.
2. Accelerate vehicle to maintain the following conditions. ACCELE POSI: 1.5/8 - 2.0/8
SLCT LVR POSI: “D” position
GEAR: “2”
“3” (HLR/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
3. Perform step “2” again.
4. Turn ignition switch OFF, then perform step “1” to “3” again.
5. Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT- II.
If DTC (P1846) is detected, go to AT- 1 7 8 , "
Diagnostic Procedure" .
If DTC (P1767) is detected, go to AT- 1 5 9 , "
Diagnostic Procedure" .
Item name Condition Display value
ATF PRES SW 6 High and low reverse clutch engaged. Refer to
AT- 2 2
.ON
High and low reverse clutch disengaged Refer to AT- 2 2
.OFF
BCIA0031E

AT-178
DTC P1846 ATF PRESSURE SWITCH 6
Revision: 2006 December 2006 FX35/FX45
Diagnostic ProcedureNCS001H8
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start the engine.
2. Select “ECU INPUT SIGNALS” or “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Drive vehicle in the “D” position (2nd
3rd gear), and confirm
the ON/OFF actuation of the “ATF PRES SW 6”.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 7 9 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check the following.

A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 9 , "Control Valve with TCM and A/T Fluid Tem-
perature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform AT- 1 7 7 , "
DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
ATF PRES SW 6 High and low reverse clutch engaged.
Refer to AT- 2 2
. ON
High and low reverse clutch disengaged
Refer to AT- 2 2
. OFFPCIA0067E

AT-180
MAIN POWER SUPPLY AND GROUND CIRCUIT
Revision: 2006 December 2006 FX35/FX45
TCM terminals and data are reference value. Measured between each terminal and ground.
Diagnostic ProcedureNCS001HA
1. CHECK TCM POWER SOURCE STEP 1
1. Turn ignition switch OFF.
2. Disconnect A/T assembly harness connector.
3. Check voltage between A/T assembly harness connector termi- nals and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. CHECK TCM POWER SOURCE STEP 2
1. Disconnect A/T assembly harness connector.
2. Turn ignition switch ON. (Do not start engine.)
3. Check voltage between A/T assembly harness connector termi- nals and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
Terminal Wire
color Item Condition Data (Approx.)
1LG Power supply
(Memory back-up) Always Battery voltage
2LG Power supply
(Memory back-up) Always Battery voltage
5 B Ground Always 0 V
6 Y Power supply – Battery voltage
–0 V
10 B Ground Always 0 V
Item Connector Terminal Voltage
TCM F44 1 - Ground
Battery voltage
2 - Ground
6 - Ground 0 V
SCIA2104E
Item Connector Terminal Voltage
TCM F44 1 - Ground
Battery voltage
2 - Ground
6 - Ground
SCIA2105E

CLOSED THROTTLE POSITION AND WIDE OPEN THROTTLE POSITION CIR- CUIT
AT-183
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Revision: 2006 December 2006 FX35/FX45
CLOSED THROTTLE POSITION AND WIDE OPEN THROTTLE POSITION CIR-
CUIT
PFP:18002
CONSULT-II Reference ValueNCS001HB
Diagnostic ProcedureNCS001HC
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to AT- 9 2 , "
SELF-DIAGNOSTIC RESULT MODE" , AT- 1 0 2 , "Diagnostic Pro-
cedure without CONSULT-II" .
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 1 0 4 , "DTC U1000 CAN COMMUNICATION LINE" .
NO >> GO TO 2.
2. CHECK THROTTLE POSITION SIGNAL CIRCUIT
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Depress accelerator pedal and read out the value of “CLSD THL POS” and “W/O THL POS”.
OK or NG
OK >> INSPECTION END
NG >> Check the following items. If NG, repair or replace damaged parts.

Perform the self-diagnosis for “ENGINE” with CONSULT-II. Refer to EC-122, "SELF-DIAG
RESULTS MODE" (for VQ35DE) or EC-783, "SELF-DIAG RESULTS MODE" (for VK45DE).

Open circuit or short to ground or short to power in harness or connectors.

Pin terminals for damage or loose connection with harness connector.
Item name Condition Display value
CLSD THL POS Released accelerator pedal. ON
Fully depressed accelerator pedal. OFF
W/O THL POS Fully depressed accelerator pedal. ON
Released accelerator pedal. OFF
Accelerator Pedal Operation Monitor Item
CLSD THL POS W/O THL POS
Released ON OFF
Fully depressed OFF ON
PCIA0070E

AT-184
BRAKE SIGNAL CIRCUIT
Revision: 2006 December 2006 FX35/FX45
BRAKE SIGNAL CIRCUITPFP:25320
CONSULT-II Reference ValueNCS001HD
Diagnostic ProcedureNCS001HE
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to AT- 9 2 , "
SELF-DIAGNOSTIC RESULT MODE" , AT- 1 0 2 , "Diagnostic Pro-
cedure without CONSULT-II" .
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 1 0 4 , "DTC U1000 CAN COMMUNICATION LINE" .
NO >> GO TO 2.
2. CHECK STOP LAMP SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out ON/OFF switching action of the “BRAKE SW”.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK STOP LAMP SWITCH
Check continuity between stop lamp switch harness connector E210
terminals 1 and 2. Refer to AT- 1 8 6 , "
Wiring Diagram — AT — NON-
DTC" .
Check stop lamp switch after adjusting brake pedal — refer to
BR-6, "
BRAKE PEDAL" .
OK or NG
OK >> Check the following items. If NG, repair or replace dam- aged parts.

Harness for short or open between battery and stop lamp switch.

Harness for short or open between stop lamp switch and unified meter and A/C amp.
NG >> Repair or replace the stop lamp switch.
Item name Condition Display value
BRAKE SW Depressed brake pedal. ON
Released brake pedal. OFF
Item name Condition Display value
BRAKE SW Depressed brake pedal. ON
Released brake pedal. OFF
PCIA0070E
Condition Continuity
When brake pedal is depressed Yes When brake pedal is released No
SCIA2144E

A/T INDICATOR CIRCUIT AT-185
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Revision: 2006 December 2006 FX35/FX45
A/T INDICATOR CIRCUITPFP:24810
DescriptionNCS001HF
TCM sends the switch signals to combination meters. By CAN communication line. Then manual mode switch
position is indicated on the A/T indicator.
CONSULT-II Reference ValueNCS001HG
Diagnostic ProcedureNCS001HH
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II and read out the value of “GEAR”.
3. Drive vehicle in the manual mode, and confirm that the actual gear position and the meter's indication of the position mutually
coincide when the selector lever is shifted to the “+ (up)” or “-
(down)” side (1st ⇔ 5th gear).
OK or NG
OK >> INSPECTION END
NG >> Check the following.
A/T INDICATOR SYMPTOM CHART
Item name Condition Display value
GEAR During driving 1, 2, 3, 4, 5
PCIA0065E
Items Presumed Location of Trouble
The actual gear position does not change, or shifting into the
manual mode is not possible (no gear shifting in the manual
mode possible).
The A/T indicator is not indicated. Manual mode switch

Refer to
AT-166, "DTC P1815 MANUAL MODE SWITCH" .
A/T main system (Fail-safe function actuated)

Refer to AT-92, "SELF-DIAGNOSTIC RESULT MODE" .
The actual gear position changes, but the A/T indicator is not indi-
cated. Perform the self-diagnosis function.

Refer to
AT-92, "SELF-DIAGNOSTIC RESULT MODE" .
The actual gear position and the indication on the A/T indicator
do not coincide. Perform the self-diagnosis function.

Refer to
AT-92, "SELF-DIAGNOSTIC RESULT MODE" .
Only a specific position or positions is/are not indicated on the A/
T indicator. Check the unified meter and A/C amp.

Refer to
DI-5, "COMBINATION METERS" .