2005 INFINITI FX35 Ignition switch

AT-168
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
Revision: 2005 July 2005 FX
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTIONPFP:31940
DescriptionACS002Q5

Low coast brake solenoid valve is turned ON or OFF by the TCM in response to signals sent from the
PNP switch, vehicle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears
will then be shifted to the optimum position.

This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-II Reference ValueACS003KQ
On Board Diagnosis LogicACS002Q6

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1774 LC/B SOLENOID FNCT” with CONSULT-II or 7th judgement flicker with-
out CONSULT-II is detected under the following conditions.
–When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 2 is irregular during depressing accelerator pedal. (Other than during shift change)
–When TCM detects that relation between gear position and condition of ATF pressure switch 2 is irregular
during releasing accelerator pedal. (Other than during shift change)
Possible CauseACS002Q7

Harness or connectors
(Solenoid and switch circuits are open or shorted.)

Low coast brake solenoid valve

ATF pressure switch 2
DTC Confirmation ProcedureACS002Q8
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. Selector lever: “M” position
Gear position: “M1-1st” or “M2-2nd” gear (LC/B ON/OFF)
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 (P1774) is detected, go to AT- 1 6 9 , "
Diagnostic Proce-
dure" .
If DTC (P1772) is detected, go to AT- 1 6 7 , "
Diagnostic Proce-
dure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value
ON OFF SOL Low coast brake engaged. Refer to
AT- 2 1
.ON
Low coast brake disengaged. Refer to AT- 2 1
.OFF
ATF PRES SW 2 Low coast brake engaged. Refer to
AT- 2 1
.ON
Low coast brake disengaged. Refer to AT- 2 1
.OFF
BCIA0031E

AT-170
DTC P1815 MANUAL MODE SWITCH
Revision: 2005 July 2005 FX
DTC P1815 MANUAL MODE SWITCHPFP:34901
DescriptionACS002QA
Manual mode switch is installed in A/T device. It sends manual mode switch, shift up and shift down switch
signals to TCM.
TCM sends the switch signals to unified meter and A/C amp. By CAN communication line. Then manual mode
switch position is indicated on the A/T indicator. For inspection, refer to AT- 1 8 9 , "
A/T INDICATOR CIRCUIT" .
CONSULT-II Reference Value in Data Monitor ModeACS002QB
On Board Diagnosis LogicACS002QC

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

Diagnostic trouble code “P1815 MANU MODE SW/CIR” with CONSULT-II is detected when TCM moni-
tors Manual mode, Non manual mode, Up or Down switch signal, and detects as irregular when impossi-
ble input pattern occurs 1 second or more.
Possible CauseACS002QD

Harness or connectors
(These switches circuit is open or shorted.)

Manual mode select switch (Into control device)

Manual mode position select switch (Into control device)
DTC Confirmation ProcedureACS002QE
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. Turn ignition switch ON. (Do not start engine.)
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Move selector lever to “M” position.
5. Drive vehicle for at least 2 consecutive seconds.
6. If DTC is detected, go to AT- 1 7 3 , "
Diagnostic Procedure" .
Item name Condition Display Value
MANU MODE SW Manual shift gate position (neutral) ON
Other than the above OFF
NON M-MODE SW Manual shift gate position OFF
Other than the above ON
UP SW LEVER selector lever: + side ON
Other than the above OFF
DOWN SW LEVER selector lever: - side ON
Other than the above OFF
BCIA0031E

DTC P1815 MANUAL MODE SWITCH AT-173
D E
F
G H
I
J
K L
M A
B
AT
Revision: 2005 July 2005 FX
TCM terminals and data are reference value. Measured between each terminal and ground.
Diagnostic ProcedureACS002QF
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to AT- 9 3 , "
SELF-DIAGNOSTIC RESULT MODE" .
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 1 0 6 , "DTC U1000 CAN COMMUNICATION LINE" .
NO >> GO TO 2.
2. CHECK MANUAL MODE 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 “MANU MODE SW”, “NON M-MODE SW”, “UP SW LEVER”, “DOWN SW LEVER”.
Without CONSULT-II
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 >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING ITEM
Check the following items.

Manual mode switch. Refer to AT- 1 7 4 , "Component Inspection" .

Pin terminals for damage or loose connection with harness connector.

Open circuit or short to ground or short to power in harness or connector for A/T device (manual mode
switch).

Unified meter and A/C amp. Refer to DI-5, "COMBINATION METERS" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
Terminal Wire
color Item Condition Data (Approx.)
3 L CAN-H – –
8 R CAN-L – –
9GYStarter relay Selector lever in “N” and “P” positions. Battery voltage
Selector lever in other positions. 0V
Item name Condition Display Value
MANU MODE SW Manual shift gate position (neutral) ON
Other than the above OFF
NON M-MODE SW Manual shift gate position OFF
Other than the above ON
UP SW LEVER selector lever: +side ON
Other than the above OFF
DOWN SW LEVER selector lever: -side ON
Other than the above OFF
SCIA4988E

DTC P1841 ATF PRESSURE SWITCH 1 AT-175
D E
F
G H
I
J
K L
M A
B
AT
Revision: 2005 July 2005 FX
DTC P1841 ATF PRESSURE SWITCH 1PFP:25240
DescriptionACS002QI
Fail-safe function to detect front brake clutch solenoid valve condition.
CONSULT-II Reference ValueACS003KR
On Board Diagnosis LogicACS002QJ

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

Diagnostic trouble code “P1841 ATF PRES SW 1/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 1
is irregular during depressing accelerator pedal. (Other than during shift change)
Possible CauseACS002QK

ATF pressure switch 1

Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureACS002QL
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
Selector lever: “D” position
Gear position: 3rd
4th Gear (FR/B 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 (P1841) is detected, go to AT- 1 7 6 , "
Diagnostic Procedure" .
If DTC (P1757) is detected, go to AT- 1 5 5 , "
Diagnostic Procedure" .
Item name Condition Display value
ATF PRES SW 1 Front brake engaged. Refer to
AT- 2 1
.ON
Front brake disengaged. Refer to AT- 2 1
.OFF
BCIA0031E

DTC P1843 ATF PRESSURE SWITCH 3 AT-177
D E
F
G H
I
J
K L
M A
B
AT
Revision: 2005 July 2005 FX
DTC P1843 ATF PRESSURE SWITCH 3PFP:25240
DescriptionACS002QN
Fail-safe function to detect input clutch solenoid valve condition.
CONSULT-II Reference ValueACS003JZ
On Board Diagnosis LogicACS002QO

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

Diagnostic trouble code “P1843 ATF PRES SW 3/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 3
is irregular during depressing accelerator pedal. (Other than during shift change)
Possible CauseACS002QP

ATF pressure switch 3

Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureACS002QQ
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
Selector lever: “D” position
Gear position: 3rd
4th Gear (I/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 (P1843) is detected, go to AT- 1 7 8 , "
Diagnostic Procedure" .
If DTC (P1752) is detected, go to AT- 1 5 1 , "
Diagnostic Procedure" .
Item name Condition Display value
ATF PRES SW 3 Input clutch engaged. Refer to
AT- 2 1
.ON
Input clutch disengaged. Refer to AT- 2 1
.OFF
BCIA0031E

DTC P1845 ATF PRESSURE SWITCH 5 AT-179
D E
F
G H
I
J
K L
M A
B
AT
Revision: 2005 July 2005 FX
DTC P1845 ATF PRESSURE SWITCH 5PFP:25240
DescriptionACS002QS
Fail-safe function to detect direct clutch solenoid valve condition.
CONSULT-II Reference ValueACS003K0
On Board Diagnosis LogicACS002QT

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 CauseACS002QU

ATF pressure switch 5

Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureACS002QV
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
Selector lever: “D” position
Gear position: 1st
2nd Gear (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 8 0 , "
Diagnostic Procedure" .
If DTC (P1762) is detected, go to AT- 1 5 9 , "
Diagnostic Procedure" .
Item name Condition Display value
ATF PRES SW 5 Direct clutch engaged. Refer to
AT- 2 1
.ON
Direct clutch disengaged. Refer to AT- 2 1
.OFF
BCIA0031E

DTC P1846 ATF PRESSURE SWITCH 6 AT-181
D E
F
G H
I
J
K L
M A
B
AT
Revision: 2005 July 2005 FX
DTC P1846 ATF PRESSURE SWITCH 6PFP:25240
DescriptionACS002QX
Fail-safe function to detect high and low reverse clutch solenoid valve condition.
CONSULT-II Reference ValueACS003K1
On Board Diagnosis LogicACS002QY

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 CauseACS002QZ

ATF pressure switch 6

Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation ProcedureACS002R0
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
Selector lever: “D” position
Gear position: 2nd
3rd Gear (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 8 2 , "
Diagnostic Procedure" .
If DTC (P1767) is detected, go to AT- 1 6 3 , "
Diagnostic Procedure" .
Item name Condition Display value
ATF PRES SW 6 High and low reverse clutch engaged. Refer to
AT- 2 1
.ON
High and low reverse clutch disengaged Refer to AT- 2 1
.OFF
BCIA0031E

AT-184
MAIN POWER SUPPLY AND GROUND CIRCUIT
Revision: 2005 July 2005 FX
TCM terminals and data are reference value. Measured between each terminal and ground.
Diagnostic ProcedureACS00863
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 0V
6 Y Power supply – Battery voltage
–0V
10 B Ground Always 0V
Item Connector Terminal
(Wire color) Voltage
TCM F44 1 (LG) - Ground
Battery voltage
2 (LG) - Ground
6 (Y) - Ground 0V
SCIA2104E
Item Connector Te r m i n a l
(Wire color) Voltage
TCM F44 1 (LG) - Ground
Battery voltage
2 (LG) - Ground
6 (Y) - Ground
SCIA2105E