1995 ACURA TL relay

Starter Switc h Signa l
This signal s th e EC M whe n th e engin e is cranking .
NOTE: Transmissio n in o r position .
A (26P)ECM CONNECTOR S
Wir e sid e o t femal e terminal s
I s ther e batter y voltage ?
Is th e fus e OK ? Repai
r shor t i n th e wir e be -
twee n th e EC M (B5 ) an d th eNo . 9 STARTE R SIGNA L (7. 5
A ) fus e o r th e PGM-F I mai n
relay .Replac e th e No . 9 STARTE R
SIGNA L (7. 5 A ) fuse .
B (16P )
Inspectio n o f Starte r Switc h Sig -nal.
Chec k fo r a n ope n o r shor t i n th e
wir e (ST S line) :
Measur e voltag e betwee n EC M
connecto r terminal s B 5 an d A2 6on th e EC M connector s wit h th e
ignitio n switc h i n th e star t posi -
tion (III) .
Starte r switc h signa l i s OK . Inspec
t th e No . 9 STARTE R SIG -
NA L (7. 5 A ) fus e in th e under-das h
fuse/rela y box .
Repai r ope n in th e wir e betwee n
the EC M (B5 ) and th e No . 9STARTE R SIGNA L (7. 5 A ) fuse .
ProCarManuals.com

(From pag e 11-108 )
I s ther e a clickin g nois e fro m
th e A/ C compresso r clutch ?
Chec k th e A/ C operation :
1 . Star t th e engine .
2 . Tur n th e blowe r switc h ON .
3 . Tur n th e A/ C switc h ON .
Doe s th e A/ C operate ?
Ai r conditionin g signa l i s OK . Chec
k fo r a n ope n i n th e wire
(AC C line) :Momentaril y connec t th e A/ C
clutc h rela y connecto r termina l
No. 2 to bod y groun d wit h ajumpe r wir e severa l times . A/
C CLUTC H RELA Y CONNECTO R (C328 )JUMPE RWIRE
Wire sid e o f
femal e terminal s
I s ther e a clickin g nois e fro m
th e A/ C compresso r clutch ? Se
e ai r conditione r inspectio n
(se e sectio n 22 ).
Repai r ope n i n th e wir e betwee n
th e EC M (A8 ) an d th e A/ C clutc h
relay.
ECM CONNECTOR S
A (26P)B (16P)
Chec k fo r a n ope n i n th e wir e
(AC C line) :
Measur e voltag e betwee n EC M
connecto r terminal s A2 6 an d B3 . Wir
e sid e o f femal e terminal s
I s voltag e les s tha n 1. 0 V ? Repai
r ope n i n th e wir e betwee n
th e EC M (B3 ) an d th e A/ C switch .
Substitut e a known-goo d EC M
an d recheck . I f symptom/indi -
catio n goe s away , replac e th e
origina l ECM .
Se e th e ai r conditione r inspec -
tion (se e sectio n 22 ).
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Fuel Supply System

System Description

The fuel supply system consists of a fuel tank, in-tank

high pressure fuel pump, PGM-FI main relay, fuel filter,

fuel pressure regulator, fuel injectors, and fuel delivery

and return lines. This system delivers pressure-regulat-

ed fuel to the fuel injectors and cuts the fuel delivery

when the engine is not running.

11-124ProCarManuals.com

PGM-FI Main Relay

Description

The PGM-FI main relay actually contains two individual

relays. This relay is located at the left side of the cowl.

One relay is energized whenever the ignition is on which

supplies the battery voltage to the ECM, power to the

fuel injectors, and power for the second relay. The second

relay is energized for two seconds when the ignition is

switched on, and when the engine is running, to supply

power to the fuel pump.

PGM-FI

MAIN RELAY

FUEL PUMP
Relay Testing

NOTE: If the car starts and continues to run, the PGM-FI

main relay is OK.

1. Remove the PGM-FI main relay.

2.

Attach the battery positive terminal to the No. 2 ter-

minal and the battery negative terminal to the No. 1

terminal of the PGM-FI main relay. Then check for

continuity between the No. 5 terminal and No. 4 ter-

minal of the PGM-FI main relay.

If there is continuity, go on to step 3.

If there is no continuity, replace the PGM-FI main

relay and retest.

3. Attach the battery positive terminal to the No. 5 ter-

minal and the battery negative terminal to the No. 3

terminal of the PGM-FI main relay. Then check that

there is continuity between the No. 7 terminal and

No. 6 terminal of the PGM-FI main relay.

If there is continuity, go on to step 4.

If there is no continuity, replace the PGM-FI main

relay and retest.

4. Attach the battery positive terminal to the No. 6 ter-

minal and the battery negative terminal to the No. 1

terminal of the PGM-FI main relay. Then check that

there is continuity between the No. 5 terminal and

No. 4 terminal of the PGM-FI main relay.

If there is continuity, the PGM-FI main relay is OK.

If there is no continuity, replace the PGM-FI main

relay and retest.ProCarManuals.com

Fuel Suppl y Syste m
PGM-F I Mai n Rela y (cont'd )
Troubleshootin g
Engine wil l no t start .
Inspectio n o f PGM-F I mai n
rela y an d rela y harness .
Chec k fo r a n ope n i n th e wir e
(GN D line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e PGM-F I mai n
rela y 7 P connector .
3 . Chec k fo r continuit y betwee n
th e PGM-F I mai n rela y 7 P con -
necto r termina l No . 3 an d bod y
ground .
I s ther e continuity ?
Chec k fo r a n ope n o r shor t i n th e
wir e (BA T line) :
Measur e voltag e betwee n th e
PGM-F I mai n rela y 7 P connecto r
termina l No . 7 an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n o r shor t i n th e
wir e (IG 1 line) :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e th e voltag e betwee n
th e PGM-F I mai n rela y 7 P con -
necto r termina l No . 5 an d bod y
ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n o r shor t i n th e
wir e (ST S line) :
1. Tur n th e ignitio n switc h to th eSTAR T (III ) position .NOTE: Transmissio n i n o rposition .2. Measur e th e voltag e betwee n
th e PGM-F I mai n rela y 7 P con -
necto r termina l No . 2 an d bod y
ground .
(T o pag e 11-133 ) PGM-F
I MAI N RELA Y 7 P CONNECTO R (C417 )
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e PGM-F I mai n rela y an d G101 .
Replac e th e EC U (ECM ) (1 5 A )
fus e i n th e under-hoo d fuse /
relay box .Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F I
mai n rela y an d th e EC U (ECM )
(1 5 A ) fuse .
Replac e th e No . 2 FUE L PUM P
(1 5 A ) fus e in th e under-das h
fuse/rela y box .
Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F I mai n
rela y an d th e No . 2 FUE L
PUM P (1 5 A ) fuse .
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(From pag e 11-132 )
I s ther e 1. 0 V or less ?
Replac e th e No . 9 STARTE RSIGNAL (7. 5 A ) fus e i n th e
under-das h fuse/rela y box .
Repai r ope n o r shor t i n th ewir e betwee n th e PGM-F I mai n
rela y an d th e No . 9 STARTE R
SIGNA L (7. 5 A ) fuse . PGM-F
I MAI N RELA Y 7 P CONNECTO R (C417 )
Wir e sid e o f femal e terminal s
Repai r ope n i n th e wir e betwee n
th e EC M (A4 ) an d th e PGM-F I
mai n relay .
ECM CONNECTOR S
Wir e sid e o f femal e terminal s
Repai r ope n i n th e wir e bet -
wee n th e EC M (A13 , B1 ) an d
th e PGM-F I mai n relay .
Replac e th e PGM-F I mai n relay .
ECM CONNECTO R A (26P )
Wir e sid e o f femal e terminal s
Substitut e a known-goo d EC M
an d recheck . I f prescribe d voltag e
i s no w available , replac e th e orig -
ina l ECM .
Chec k th e PGM-F I mai n rela y
(se e pag e 11-131 ).
Chec
k fo r a n ope n in th e ECM :
1. Tur n th e ignitio n switc h OFF .2. Measur e voltag e betwee n EC M
connecto r terminal s A 4 an d
A12 whe n th e ignitio n switc his firs t turne d O N (II ) fo r tw o
seconds .
I
s ther e batter y voltage ?
Chec
k fo r a n ope n i n th e wire s
(IGP1 , IGP 2 lines) :
1 . Reconnec t th e EC M connecto r
A (26P) .2. Reconnec t th e PGM-F I mai n
rela y connector .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e voltag e betwee n EC M
connecto r terminal s A1 2 an d
A13 , an d betwee n A1 2 an d B1 .
I
s ther e continuity ? EC
M CONNECTO R A (26P )
B (16P)A (26P )
Wire sid e o f femal e terminal s
Chec
k fo r a n ope n i n th e wir e
(FL R line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e EC M connec -
tor A (26P) .3. Chec k fo r continuit y betwee n
th e PGM-F I mai n rela y 7 P con -
necto r termina l NO . 1 an d EC M
connecto r termina l A4 .
Is ther e batter y voltage ?
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Intake Air System

System Description

The system supplies air for all engine needs. It consists of the intake air pipe, Air Cleaner (ACL), intake air duct. Throttle

Body (TB), Idle Air Control (IAC) Valve, fast idle thermo valve, and intake manifold.

A resonator in the intake air pipe provides additional silencing as air is drawn into the system.

IAB CONTROL

SOLENOID VALVE

IAB

CHECK

VALVE

IAB

CONTROL

DIAPHRAGM
From No. 4 ECU

(ECM) ('95 - 96 models: 15A,

'97-98 models: 20A)

FUSE

(in the under-dash

fuse/relay box)

From PGM-FI

MAIN RELAY

VARIOUS

SENSORS

IAB

VACUUM TANK

THROTTLE
BODY

INTAKE

AIR DUCT

ACL

INTAKE

MANIFOLD
IDLE

ADJUSTING

SCREW
FAST

IDLE

THERMO

VALVE

RESONATOR
INTAKE

AIR

PIPE
IAC VALVE

ENGINE

COOLANT
ENGINE

COOLANT

IAB

VALVE
ECMProCarManuals.com

Intake Air Bypass (IAB) Control System

Description

Two air intake paths are provided in the intake manifold to allow the selection of the intake path most favorable for a

given engine speed. Satisfactory power performance is achieved by closing and opening the intake Air Bypass (IAB)

valves. High torque at low rpm is achieved when the IAB valves are closed, whereas high power at high rpm is achieved

when the IAB valves are opened.

IAB CONTROL

DIAPHRAGM

From No. 4 ECU (ECM)

('95-96 models: 15A,

'97 - 98 models: 20A) FUSE

(In the under-dash

fuse/relay box)

VARIOUS

SENSORS

IAB

CONTROL

SOLENOID

VALVE

IAB VACUUM TANK

IAB CONTROL SOLENOID VALVE OFF

ENGINE RPM IS ABOVE 4,800 rpmProCarManuals.com