Infiniti Q45 (FY33). Manual — part 97
SBR670DB
Diagnostic Procedure 18 (THROTTLE MOTOR
RLY [SHORT] (-a)/THROTTLE MOTOR RLY
[OPEN] (-b): Throttle motor relay circuit for
open circuit and short circuit)
Code No. 23 and 24 of TAC module
SBR671D
SBR553CA
THROTTLE MOTOR RELAY POWER
SUPPLY CHECK
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Check 15A fuse
56
. For fuse layout, refer
to POWER SUPPLY ROUTING in EL sec-
tion.
OK
E
NG
q
A
(Go to next page.)
Check 10A fuse
30
. For fuse layout, refer
to POWER SUPPLY ROUTING in EL sec-
tion.
OK
E
NG
q
B
(Skip page.)
1. Disconnect TAC module connector.
Check terminals for damage or loose
connection. Then reconnect connectors.
2. Carry out self-diagnosis again.
Do SLIP indicator and TCS OFF indi-
cator activate again?
Yes
E
No
Inspection end
THROTTLE MOTOR RELAY CIRCUIT
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
I
Disconnect connectors from TAC mod-
ule.
I
Turn ignition switch ON.
I
Check voltage between the following
terminals by grounding terminal
q
14
.
Battery voltage should exist.
NG
E
OK
Preliminary check (Basic
inspection 3), BR-48
Check voltage between terminal
q
14
for
TAC module connector and ground.
Battery voltage should exist.
NG
E
OK
q
D
(Skip page.)
q
C
TAC module
Motor
108
Ground
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
H
H
H
H
H
BR-105
SBR672DA
q
C
CHECK THROTTLE MOTOR RELAY.
I
Remove battery.
I
Remove throttle motor relay.
I
Refer to THROTTLE MOTOR RELAY in
Electrical Component Inspection,
BR-126.
OK
E
NG
Replace throttle motor
relay.
I
Check continuity between terminal
q
14
for TAC module connector and terminal
q
2
for throttle motor relay connector.
Continuity should exist.
OK
E
NG
Check the following.
I
Harness connectors
F75
,
B146
I
Harness for open or
short between throttle
motor relay connectors
and TAC module
If NG, repair harness or
connectors.
Repair harness and connector between
terminal
q
1
for throttle motor relay con-
nector and right side terminal of fuse No.
30 in fuse box.
For fuse layout, refer to EL section,
“POWER SUPPLY ROUTING”.
SBR785DA
q
A
Replace fusible link.
Does the fusible link blow out?
Yes
E
No
Inspection end
RELAY UNIT POWER SUPPLY CIRCUIT
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Disconnect throttle motor relay unit
4-pin connector
B146
.
2. Check continuity between throttle motor
relay unit 4-pin connector
B146
(body
side) terminal
q
3
and ground.
Continuity should not exist.
OK
E
NG
Check the following.
I
Harness connector
B146
I
Harness for open or
short between throttle
motor relay unit and fuse
If NG, repair harness or
connectors.
Inspection end
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
Diagnostic Procedure 18 (THROTTLE MOTOR
RLY [SHORT] (-a)/THROTTLE MOTOR RLY
[OPEN] (-b): Throttle motor relay circuit for
open circuit and short circuit) (Cont’d)
H
H
H
H
H
H
BR-106
SBR673DA
SBR674DA
SBR675DA
SBR676DA
q
B
Replace fuse.
Does the fuse blow out when ignition
switch is turned “ON”?
No
E
Yes
Check the following.
I
Harness connector
B146
I
Harness for open or
short between throttle
motor relay unit connec-
tor and fuse
If NG, repair harness or
connectors.
Inspection end
q
D
I
Check continuity between terminal
q
5
for throttle motor relay connector and
terminal
108
for TAC module connec-
tor.
Continuity should exist.
OK
NG
H
I
Check continuity between terminal
q
5
for throttle motor relay connector and
ground.
Continuity should not exist.
OK
E
NG
Repair harness and con-
nectors.
I
Check continuity between terminal
q
3
for throttle motor relay connector and
positive terminal for battery cable.
Continuity should exist.
OK
NG
H
I
Check continuity between terminal
q
3
for throttle motor relay connector and
ground.
Continuity should not exist.
OK
E
NG
Repair harness and con-
nectors.
CHECK THROTTLE MOTOR RELAY.
I
Remove battery.
I
Remove throttle motor relay.
I
Refer to THROTTLE MOTOR RELAY in
Electrical Component Inspection,
BR-126.
OK
E
NG
Replace throttle motor
relay.
Preliminary check (Basic inspection 3),
BR-48
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
Diagnostic Procedure 18 (THROTTLE MOTOR
RLY [SHORT] (-a)/THROTTLE MOTOR RLY
[OPEN] (-b): Throttle motor relay circuit for
open circuit and short circuit) (Cont’d)
H
H
H
H
H
H
H
H
BR-107
SBR677D
Diagnostic Procedure 19 (TH P/S PWR
SUPPLY: Power supply circuit for sensor)
Code No. 34 of TAC module
SBR042EA
I
Disconnect 20-pin connector from TAC
module.
I
Disconnect connector from secondary
throttle sensor.
I
Check continuity between terminal
q
15
for TAC module connector and terminal
q
3
for secondary throttle position sensor
connector.
Continuity should exist.
OK
E
NG
Repair harness and con-
nectors.
Check continuity between terminals
q
1
for
TAC module and terminal
129
for ECM.
Continuity should exist.
OK
E
NG
Repair harness and con-
nectors.
Check continuity between terminals
q
1
for
TAC module and terminal
q
1
for second-
ary throttle position sensor.
Continuity should exist.
OK
E
NG
Repair harness and con-
nectors.
Preliminary check (Basic inspection 3),
BR-48
Diagnostic Procedure 20 (THRTL/V RETURN
SPR: Secondary throttle return spring)
Code No. 32 of TAC module
Erase self-diagnosis results from TAC
module memory.
TRY SELF-DIAGNOSIS AGAIN.
Does CONSULT-II display “THRTL/V
RETURN SPR” (TAC module code No.
32) again?
Yes
E
No
Inspect system again refer-
ring displayed code No.
Be sure to remove motor connector
before inspection.
Completely close throttle valve, then open
it. If throttle valve does not open
completely, return spring may be broken.
Replace throttle chamber with new one.
TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS
H
H
H
H
BR-108
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