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