1995 ACURA TL check engine

Starter Switch Signal

This signals the PCM when the engine is cranking.

PCM CONNECTORS

A
(26P)
C
(12P)

Wire side of female terminals

Is there battery voltage?

Is the fuse OK?
Repair short in the wire be-

tween the PCM (C6) and the

No. 9 STARTER SIGNAL (7.5

A) fuse or the PGM-FI main

relay.

Replace the No. 9 STARTER

SIGNAL (7.5 A) fuse.

Repair open in the wire between

the PCM
(C6)
and the No. 9

STARTER SIGNAL (7.5 A) fuse.
Starter switch signal is OK.
Inspect the No. 9 STARTER SIG-

NAL (7.5 A) fuse in the under-dash

fuse/relay box.
Check for an open or short in the

wire (STS line):

Measure voltage between PCM

connector terminals C6 and A26

with the ignition switch in the

start position (III).
Inspection of Starter Switch Sig-

nal.
NOTE: Transmission in or position.ProCarManuals.com

(From pag e 11-108 )
Chec k fo r a n ope n in th e wir e (AT P
P N line) :
1. Tur n th e ignitio n switc h OFF .2. Reconnec t th e 16 P connecto r
t o th e gaug e assembly .
3 . Star t th e engine .
4 . Measur e voltag e betwee n PC M
connecto r terminal s E2 4 an d
A26 wit h th e transmissio n inposition .
PCM CONNECTOR S
A (26P)E (26P)
Wire sid e o f femal e terminal s
I s ther e les s tha n 1. 0 V ? Repai
r ope n in th e wir e betwee n
the PC M (E24 ) an d the gaug e
assembly .
Check fo r a n ope n in th e wir e (AT PPN line) :Measur e voltag e betwee n PC M
connecto r terminal s E2 4 an d A2 6
with th e transmissio n i n posi -tion.
Is ther e les s tha n 1. 0 V ? Repai
r ope n in th e gaug e assem -bly.
A/T gea r positio n signa l i s OK .
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Fast Idl e Therm o Valv e
Descriptio n
T o preven t errati c runnin g whe n th e engin e i s warmin g
up , i t i s necessar y t o rais e th e idl e speed . Th e fas t idl e
therm o valv e i s controlle d b y a thermowa x plunger .
Whe n th e engin e i s cold , th e engin e coolan t surround -
in g th e thermowa x contract s th e plunger , allowin g addi -
tiona l ai r t o b e bypasse d int o th e intak e manifol d s o tha t
th e engin e idle s faster . Whe n th e engin e reache s operat -
in g temperature , th e valv e closes , reducin g th e amoun t
o f ai r bypassin g int o th e intak e manifold .
FASTIDLETHERM OVALVE
IDLEADJUSTIN GSCREW
IACVALV E
AIR BYPAS SVALVE
WAX
Inspectio n
NOTE: Th e fas t idl e therm o valv e i s factor y adjusted ; i t
shoul d no t b e disassembled .
1 . Remov e th e cove r o f th e fas t idl e therm o valve .
2 . Star t th e engine .
3.Pu t you r finge r o n th e valv e sea t are a an d mak e sur e
tha t ther e i s ai r flo w wit h th e engin e col d (engin e
coolan t temperatur e belo w 86°F , 30°C ) an d idling .
FASTIDLETHERM OVALVE
• I f not , replac e th e fas t idl e therm o valv e an d retest .
O-RING SReplace .
12 N- m(1.2 kgf-m , 8. 7 Ibf-ft )
4.
5.
Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h n o
loa d (transmissio n in o r position ) unti l th e radia -
to r fa n come s on , the n le t i t idle .
Chec k tha t th e valv e i s completel y closed . I f not , ai r
suctio n ca n b e fel t i n th e valv e sea t area .
I f an y suctio n is felt , th e valv e is leaking .
Chec k engin e coolan t leve l an d fo r ai r i n th e engin e
coolin g syste m (se e sectio n 10 ).
I f OK , replac e th e fas t idl e therm o valv e an d
recheck .
NOTE: I f th e cove r o f fast idle therm o valv e wa s removed ,
d o th e PC M rese t procedure .
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Idle Contro l Syste m
Idle Spee d Settin g
Inspection/Adjustmen t
NOTE:
Before settin g th e idl e speed , chec k th e followin g
items :
— Th e MI L ha s no t bee n reporte d on .
— Ignitio n timin g
— Spar k plug s
— Ai r cleane r (ACL )
— PC V syste m
(Canada ) Pul l th e parkin g brak e leve r up . Star t th e
engine , the n chec k tha t th e headlight s ar e off .
1 . Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (transmissio n i n o r position ) unti l th e
radiato r fa n come s on , the n le t i t idle .
2 . Connec t a OBDI I sca n too l (se e pag e 11-32 ) o r
tachometer .
• Connec t a tachomete r t o th e ignitio n contro l
module (ICM ) secondary , or.. .
TACHOMETE R
ICM
Remov e th e rubbe r ca p fro m th e tachomete r
connecto r an d connec t a tachometer .
TACHOMETE R TACHOMETE R
CONNECTOR
RUBBERCAP
3. Disconnec t th e IA C valv e connector .
4.
5 .
IA C VALV E
Start th e engin e wit h th e accelerato r peda l slightl y
depressed . Stabiliz e th e rp m a t 1,000 , the n slowl y
releas e th e peda l unti l th e engin e idles .
Check idlin g in no-loa d conditions : headlights , blow -
er fan , rea r defogger , radiato r fan , an d ai r conditione r
ar e no t operating .
Idl e spee d shoul d be :
480 5 0 rp m
(in o r position )
Adjus t th e idl e speed , i f necessary , b y turnin g th e
idl e adjustin g screw .
NOTE : Afte r adjustin g th e idl e spee d i n thi s step ,
rechec k th e ignitio n timin g (se e sectio n 23 ).
I f i t i s ou t o f spec , g o bac k t o ste p 4 .
IDL E ADJUSTIN G SCRE W
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14. Align the center line on the connector with the mark on the fuel rail.

15. Install and tighten the retainer nuts.

16. Connect the fuel hose to the fuel rail.

17. Connect the vacuum hose and fuel return hose to the fuel pressure regulator.

18. Install the connectors on the fuel injectors.

19. Install the engine cover.

20. Turn the ignition switch ON (ll) but do not operate the starter. After the fuel pump runs for approximately two seconds,

the fuel pressure in the fuel line rises. Repeat this two or three times, then check whether there is any fuel leakage.
FUEL

INJECTOR
MARKINGS
FUEL

RAIL
FUEL RAIL

INSULATOR
FUEL

RAILSProCarManuals.com

Troubleshooting Flowchar t
No. 1 VACUU MHOSEVACUU M
PUMP/GAUG E
A973 X - 04 1 - XXXX X
FUELPRESSUR EREGULATO R
Is ther e manifol d vacuum ?
Is ther e vacuum ?
Chec k th e Fue l Pressur e Regula -
to r Contro l Solenoi d Valve :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e 4 P connecto r
fro m th e contro l box .
3 . Connec t batter y positiv e t o
termina l No . 4 an d batter y
negativ e t o termina l No . 3 on
th e 4 P connector .
4 . Star t th e engin e an d allo w it
to idle .
Chec k th e No . 1 an d No . 3 vacu -
u m hose .
I f hose s ar e OK , replac e th e fue l
pressur e regulato r contro l sole -
noi d valve .
Inspec t fo r a shor t t o groun d in
wir e betwee n PC M (A10 ) an d th e
4P connector .If th e wir e i s OK , substitut e a
known-goo d PC M an d recheck . I f
sympto m goe s away , replac e th e
origina l PCM .
CONTRO L BO X4P CONNECTO R (C218 )
I s ther e manifol d vacuum ? Replac
e th e fue l pressur e regula -
to r contro l solenoi d valve . Termina
l sid e o f mal e
terminal s
(T o pag e 11-126 ) Disconnec
t th e 4 P connecto r
fro m th e contro l box .
Chec
k fo r vacuu m at idle :
1 . Star t th e engine . Hol d th e
engin e a t 3,00 0 rp m wit h n o
loa d (transmissio n in o r
position ) unti l th e radiato r fa n
come s on .
2 . Disconnec t th e No . 1 vacuu m
hos e fro m th e fue l pressur e
regulato r an d connec t a vac -
uu m gaug e to th e hose .
Inspectio
n o f Fue l Pressur e
Regulato r Contro l Solenoi d Valve .
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PGM-FI Main Relay

Description

This PGM-FI main relay is located at the left side of the

cowl. The PGM-FI main relay actually contains two indi-

vidual relays. One relay is energized whenever the igni-

tion is on. It supplies battery voltage to the PCM, 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.

It supplies 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.

Remove the PGM-FI main relay.

Attach the battery positive terminal to the No. 3*

terminal and the battery negative terminal to the

No. 2* terminal of the PGM-FI main relay. Then

check for continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.

If there is continuity, go on to step 3.

If there is no continuity, replace the relay and

retest.

No. 4
*: 8P CONNECTOR

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

minal and the battery negative terminal to the No.

7* terminal of the PGM-FI main relay. Then check

that there is continuity between the No. 3 terminal

and No. 1 terminal of the PGM-FI main relay.

• If there is continuity, go on to step 4,

• If there is no continuity, replace the relay and

retest.

4. Attach the battery positive terminal to the No. 1 ter-

minal and battery negative terminal to the No. 2*

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

there is continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.

If there is continuity, the relay is OK;

If the fuel pump still does not work, go to

Harness Testing on the next page.

If there is no continuity, replace the relay and

retest.ProCarManuals.com

Fuel Suppl y Syste m
PGM-F I Mai n Rela y (cont'd )
Troubleshootin g Flowchar t
Engine wil l no t start .Inspectio n o f PGM-F I mai nrelay an d rela y harness .
Check fo r a n ope n in th e wir e (PG 1line) :1. Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PGM-F I mai n
rela y 4 P connecto r an d 8 P
connector .3. Chec k fo r continuit y betwee n
th e PGM-F I mai n rela y 8 P
connecto r termina l No . 7 an d
bod y ground . PGM-F
I MAI N RELA Y 8P CONNECTO R (C417 )
Wir e sid e o f femal e terminal s
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
th e PGM-F I mai n rela y an d G10 1
(locate d a t righ t middl e o f
engine) .
Check 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 4 P connecto r
termina l No . 3 an d bod y ground . PGM-F
I MAI N RELA Y 4P CONNECTO R (C418 )
BAT(YEL /BLU)
Wire sid e o f femal e terminal s
I s ther e batter y voltage ? 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 (PCM )
(2 0 A ) fuse .
Replac e th e EC U (PCM ) (2 0 A )
fus e in th e under-hoo d fuse /
relay box .
Chec k fo r a n ope n o r shor t i n th e
wir e (IGS W line) :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e voltag e betwee n th e
PGM-F I mai n rela y 8 P connec -
to r termina l No . 5 an d bod y
ground .
Is ther e batter y voltage ?
(T o pag e 11-131 ) 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 .
Replac e th e No . 2 FUE L PUM P
(15 A ) fus e i n th e under-das hfuse/relay box .
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