Infiniti Q45 (FY33). Manual — part 48
Diagnostic Procedure 2
SYMPTOM:
Ignition key cannot be removed when selector lever is set to
“P” position. It can be removed when selector lever is set to
any position except “P”.
SAT118JB
SAT744J
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-189
SAT394J
SAT936E
SAT399J
q
A
CHECK INPUT SIGNAL
(KEY SWITCH).
1. Reconnect shift lock control unit harness
connector.
2. Remove key from ignition switch.
When ignition key cannot be
removed, even if selector lever is in
“P” position, use emergency button.
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 - KEY).
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
2
and ground.
0V
OK
E
NG
Check detention switch
- key.
(Refer to “Component
Check”, AT-193.)
q
B
TROUBLE DIAGNOSES — A/T Shift Lock System
Diagnostic Procedure 2 (Cont’d)
H
H
H
H
AT-190
SAT128JA
SAT129JA
SAT599I
SAT274IB
SAT400J
q
B
CHECK INPUT SIGNAL
(DETENTION SWITCH - KEY).
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Check voltage between shift lock con-
trol unit harness terminal
q
2
and
ground with brake pedal depressed
and selector lever button pushed.
Battery voltage should exist.
3. Check voltage between shift lock con-
trol unit harness terminal
q
2
and
ground with selector lever set in any
position except “P”.
Battery voltage should exist.
OK
E
NG
Check the following items:
1. Harness for short or open
between shift lock control
unit harness terminal
q
2
and detention switch har-
ness terminal
q
7
2. Harness for short or open
between detention switch
harness terminal
q
5
and
key switch harness terminal
q
4
3. Detention switch - key
(Refer to “Component
Check”, AT-193.)
1. Set selector lever in “P” position and
release selector lever button.
2. Turn ignition switch from “ON” to
“OFF” position.
CHECK OUTPUT SIGNAL
(KEY LOCK SIGNAL).
3. Turn ignition switch from “OFF” to
“ON” position.
(Do not start engine.)
4. Check voltage between key lock sole-
noid harness terminal
q
2
and ground
at the moment ignition key is turned
from “OFF” to “ON”.
Battery voltage should exist for
approximately 0.1 seconds.
OK
E
NG
Check harness for short or
open between shift lock sole-
noid harness terminal
q
2
and
control unit harness terminal
q
8
.
OK
NG
Repair harness or
connector.
Replace control unit.
CHECK GROUND CIRCUIT FOR KEY
LOCK SOLENOID.
1. Turn ignition switch from “ON” to
“OFF” position.
2. Disconnect key lock solenoid harness
connector.
3. Check continuity between key lock
solenoid harness terminal
q
1
and
ground.
Continuity should exist.
OK
E
NG
Repair harness or connector.
INSPECTION END
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 2 (Cont’d)
H
H
H
H
H
H
AT-191
SAT131JB
Shift Lock Control Unit Inspection
I
Measure voltage between each terminal by following “SHIFT
LOCK CONTROL UNIT INSPECTION TABLE”.
I
Pin connector terminal layout.
Shift Lock Control Unit Inspection Table
(Data are reference values.)
Terminal No.
Item
Condition
Judgment standard
!
@
q
1
q
7
Power source
Battery voltage
q
2
Detention switch
(Key)
I
When the key is in key cylinder,
selector lever is in “P” position, and
selector lever button pushed.
I
When the key is in key cylinder,
selector lever is set in any position
except “P”, and selector lever button
released.
Battery voltage
Except above
0V
q
4
Detention switch
(Shift)
I
When the key is in key cylinder,
selector lever is in “P” position, and
selector lever button pushed.
I
When the key is in key cylinder,
selector lever is set in any position
except “P”, and selector lever button
released.
Battery voltage
Except above
0V
q
5
Ignition signal
Battery voltage
q
6
Shift lock signal
When selector lever is
set in “P” position and
brake pedal is depressed
Battery voltage
Except above
0V
q
8
Key lock signal
When ignition switch is turned from
LOCK, “OFF” or “ACC” to “ON”.
Battery voltage
(Approximately 0.1 seconds)
Except above
0V
TROUBLE DIAGNOSES — A/T Shift Lock System
AT-192
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