Infiniti F50. Manual — part 84
DTC P1841 ATF PRESSURE SWITCH 1
AT-221
D
E
F
G
H
I
J
K
L
M
A
B
AT
Diagnostic Procedure
ECS0088M
1.
CHECK INPUT SIGNALS (WITH CONSULT-II)
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.
Accelerate vehicle in the “D” position (3rd
Þ
4th gear), and con-
firm the ON/OFF actuation of the “ATF PRES SW 1”.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
2.
CHECK INPUT SIGNALS (WITHOUT CONSULT-II)
Without CONSULT-II
1.
Start engine.
2.
Accelerate vehicle in the “D” position (3rd
Þ
4th gear).
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
3.
CHECK POWER SOURCE CIRCUIT
1.
Turn ignition switch to “OFF” position.
2.
Disconnect TCM connector.
3.
Check continuity between A/T unit assembly harness connector
and TCM connector.
4.
If OK, check harness for short to ground and short to power.
5.
Reinstall any part removed.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
PCIA0067E
Solenoid valve
Connector
No.
Terminal No.
(Wire color)
Voltage
Front brake solenoid
valve
OFF
F104
35 (B/Y) - Ground
Battery voltage
ON
Approx. 0 V
PCIA0066E
Item
Connector No.
Terminal No.
(Wire color)
Continuity
TCM
F104
35 (B/Y)
Yes
A/T unit assembly harness
connector
F26
3 (B/Y)
SCIA3097E
AT-222
DTC P1841 ATF PRESSURE SWITCH 1
4.
CHECK TERMINAL CORD ASSEMBLY
1.
Remove oil pan. Refer to
AT-289, "Control Valve Assembly"
2.
Disconnect A/T unit assembly harness connector and control valve assembly harness connector.
3.
Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.
4.
If OK, check harness for short to ground and short to power.
OK or NG
OK
>> Replace control valve assembly. Refer to
AT-289, "Control Valve Assembly"
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK DTC
Perform DTC confirmation procedure. Refer to
AT-179, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.
6.
PERFORM TCM INSPECTION
1.
Perform TCM input/output signal inspection.
2.
If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace control valve assembly. Refer to
AT-289, "Control Valve Assembly"
NG
>> Repair or replace damaged parts.
Item
Connector No.
Terminal No. (Wire color)
Continuity
A/T unit assembly
harness connector
F26
3 (G)
Yes
Control valve assem-
bly harness connec-
tor
F302
12 (G)
SCIA3098E
DTC P1843 ATF PRESSURE SWITCH 3
AT-223
D
E
F
G
H
I
J
K
L
M
A
B
AT
DTC P1843 ATF PRESSURE SWITCH 3
PFP:25240
Description
ECS0088N
Fail-safe function to detect input clutch solenoid valve condition.
On Board Diagnosis Logic
ECS0088O
●
This is not an OBD-II self-diagnostic item.
●
Diagnostic trouble code “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
ECS0088P
●
ATF pressure switch 3
●
Harness or connectors
(The switch circuit is open or shorted.)
DTC Confirmation Procedure
ECS0088Q
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.
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 condition.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
Þ
4th Gear (I/C ON/OFF)
3.
Perform step “2” again.
4.
Turn ignition switch to “OFF” position, 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
.
If DTC (P1752) is detected, go to
AT-172, "Diagnostic Procedure"
SAT014K
AT-224
DTC P1843 ATF PRESSURE SWITCH 3
Wiring Diagram — AT — FPSW3
ECS0088R
TCM terminals and data are reference value.
TCWM0029E
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
4
P/L
SEL3
(pressure switch 3)
–
–
40
Y/G
DATA BIT1
–
–
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