Infiniti Q45. Manual — part 63
DTC P1841 ATF PRESSURE SWITCH 1
AT-165
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DTC P1841 ATF PRESSURE SWITCH 1
PFP:25240
Description
NCS000ZG
Fail-safe function to detect front brake clutch solenoid valve condition.
CONSULT-II Reference Value
NCS000ZH
On Board Diagnosis Logic
NCS000ZI
●
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 Cause
NCS000ZJ
●
ATF pressure switch 1
●
Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation Procedure
NCS000ZK
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: “3”
Þ
“4” (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-166, "Diagnostic Procedure"
If DTC (P1757) is detected, go to
AT-146, "Diagnostic Procedure"
Item name
Condition
Display value
ATF PRES SW 1
Front brake engaged. Refer to
.
ON
Front brake disengaged. Refer to
.
OFF
BCIA0031E
AT-166
DTC P1841 ATF PRESSURE SWITCH 1
Diagnostic Procedure
NCS000ZL
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 (3rd
Þ
4th gear), and confirm
the ON/OFF actuation of the “ATF PRES SW 1”.
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-173, "MAIN POWER SUPPLY AND GROUND CIR-
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-225, "Control Valve with TCM and A/T Fluid Tem-
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-165, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item name
Condition
Display value
ATF PRES SW 1
Front brake engaged. Refer to
.
ON
Front brake disengaged. Refer to
.
OFF
PCIA0067E
DTC P1843 ATF PRESSURE SWITCH 3
AT-167
D
E
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G
H
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L
M
A
B
AT
DTC P1843 ATF PRESSURE SWITCH 3
PFP:25240
Description
NCS000ZM
Fail-safe function to detect input clutch solenoid valve condition.
CONSULT-II Reference Value
NCS000ZN
On Board Diagnosis Logic
NCS000ZO
●
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 Cause
NCS000ZP
●
ATF pressure switch 3
●
Harness or connectors
(Switch circuit is open or shorted.)
DTC Confirmation Procedure
NCS000ZQ
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: “3”
Þ
“4” (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-168, "Diagnostic Procedure"
If DTC (P1752) is detected, go to
AT-142, "Diagnostic Procedure"
Item name
Condition
Display value
ATF PRES SW 3
Input clutch engaged. Refer to
.
ON
Input clutch disengaged. Refer to
.
OFF
BCIA0031E
AT-168
DTC P1843 ATF PRESSURE SWITCH 3
Diagnostic Procedure
NCS000ZR
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 (3rd
Þ
4th gear), and confirm
the ON/OFF actuation of the “ATF PRES SW 3”.
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-173, "MAIN POWER SUPPLY AND GROUND CIR-
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-225, "Control Valve with TCM and A/T Fluid Tem-
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-167, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item name
Condition
Display value
ATF PRES SW 3
Input clutch engaged. Refer to
.
ON
Input clutch disengaged. Refer to
.
OFF
PCIA0067E
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