Infiniti Q45 (FY33). Manual — part 47
Diagnostic Procedure 1
SYMPTOM:
Selector lever cannot be moved from “P” position when apply-
ing brake pedal. It can be moved when releasing brake pedal.
Selector lever can be moved from “P” position when key is
removed from key cylinder.
SAT118JA
SAT119JA
SAT393J
CHECK POWER SOURCE.
1. Turn ignition switch to “OFF” position.
2. Check voltage between shift lock control
unit harness terminal
q
1
and ground.
Battery voltage should exist.
OK
E
NG
Check the following items:
1. Harness for short or
open between battery
and shift lock control unit
harness terminal
q
1
2. 20A fuse [No.
26
,
located in the fuse block
(J/B)]
CHECK IGNITION SIGNAL.
1. Turn ignition switch to “OFF” position.
2. Check voltage between shift lock control
unit harness terminal
q
5
and ground.
0V
3. Turn ignition switch from “OFF” to “ON”
position.
(Do not start engine.)
4. Check voltage between shift lock control
unit harness terminal
q
5
and ground.
Battery voltage should exist.
OK
E
NG
Check the following items:
1. Harness for short or
open between battery
and shift lock control unit
harness terminal
q
5
2. 10A fuse [No.
17
,
located in the fuse block
(J/B)]
3. Ignition switch
Refer to EL section
(“POWER SUPPLY
ROUTING”).
CHECK GROUND CIRCUIT FOR CON-
TROL UNIT.
1. Turn ignition switch from “ON” to “OFF”
position.
2. Disconnect shift lock control unit har-
ness connector.
3. Check continuity between shift lock con-
trol unit harness terminal
q
7
and ground.
Continuity should exist.
OK
E
NG
Repair harness or connec-
tor.
q
A
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES — A/T Shift Lock System
H
H
H
AT-185
SAT394J
SAT936E
SAT395J
q
A
CHECK INPUT SIGNAL
(KEY SWITCH).
1. Reconnect shift lock control unit harness
connector.
2. Remove key from ignition switch.
3. Check voltage between A/T device har-
ness terminal
q
5
and ground.
0V
OK
E
NG
Check key switch.
(Refer to “Component
Check”, AT-194.)
1. Insert key into ignition switch.
2. Check voltage between A/T device har-
ness terminal
q
5
and ground.
Battery voltage should exist.
OK
E
NG
Check the following items:
1. Harness for short or
open between A/T device
harness terminal
q
5
and
key switch harness termi-
nal
q
4
2. Harness for short or
open between key switch
harness terminal
q
3
and
10A fuse [No.
28
,
located in the fuse block
(J/B)]
3. Key switch (Refer to
“Component Check”,
AT-194.)
CHECK INPUT SIGNAL
(DETENTION SWITCH - SHIFT).
1. Turn ignition switch from “OFF” to “ON”
position
(Do not start engine.)
2. Set selector lever in “P” position and
release selector lever button.
3. Check voltage between shift lock control
unit harness terminal
q
4
and ground.
0V
OK
E
NG
Check detention switch
- shift.
(Refer to “Component
Check”, AT-193.)
q
B
TROUBLE DIAGNOSES — A/T Shift Lock System
Diagnostic Procedure 1 (Cont’d)
H
H
H
H
AT-186
SAT123JA
SAT124JA
SAT940E
SAT396J
q
B
CHECK INPUT SIGNAL
(DETENTION SWITCH - SHIFT).
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Depress brake pedal. Push selector
lever button. Check voltage between
shift lock control unit harness terminal
q
4
and ground.
Battery voltage should exist.
3. Set selector lever in any position except
“P”. Check voltage between shift lock
control unit harness terminal
q
4
and
ground.
When selector lever cannot be moved
from “P” position with brake pedal
depressed, push shift lock release
knob. (Remove shift lock release
knob cover.)
Battery voltage should exist.
OK
E
NG
Check the following items:
1. Harness for short or
open between shift lock
control unit harness ter-
minal
q
4
and detention
switch harness terminal
q
6
2. Harness for short or
open between detention
switch harness terminal
q
5
and key switch har-
ness terminal
q
4
3. Detention switch - shift
(Refer to “Component
Check”, AT-193.)
Set selector lever in “P” position.
CHECK INPUT SIGNAL
(STOP LAMP SWITCH).
Turn ignition switch to “OFF” position. (Do
not start engine.)
I
Check voltage between A/T device har-
ness terminal
q
8
and ground.
OK
E
NG
Check the following items:
1. Harness for short or
open between A/T device
harness terminal
q
8
and
stop lamp switch harness
terminal
q
2
2. Harness for short or
open between stop lamp
switch harness terminal
q
1
and 15A fuse [No.
37
,
located in the fuse block
(J/B)]
3. Stop lamp switch
(Refer to “Component
Check”, AT-194.)
q
C
Brake pedal
Voltage
Depressed
Battery voltage
Released
0V
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES — A/T Shift Lock System
Diagnostic Procedure 1 (Cont’d)
H
H
H
H
AT-187
SAT397J
q
C
CHECK OUTPUT SIGNAL
(SHIFT LOCK SOLENOID).
1. Turn ignition switch from “OFF” to “ON”
position.
(Do not start engine.)
2. Check voltage between shift lock control
unit harness terminal
q
6
and body
ground.
OK
E
NG
Check the following items:
1. Check harness for short
or open between shift
lock control unit harness
terminal
q
6
and A/T
device harness terminal
q
9
.
2. Check shift lock solenoid.
(Refer to “Component
Check”, AT-193.)
1. Reconnect A/T device harness connec-
tor.
2. Turn ignition switch from “OFF” to “ON”
position.
(Do not start engine.)
3. Recheck shift lock operation.
OK
E
NG
1. Perform control unit
input/output signal
inspection test.
2. If NG, recheck harness
connector connection.
INSPECTION END
Brake pedal
Voltage
Depressed
Battery voltage
Released
0V
TROUBLE DIAGNOSES — A/T Shift Lock System
Diagnostic Procedure 1 (Cont’d)
H
H
H
AT-188
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