1995 ACURA TL ignition

8. Install the new SRS unit.

TORX BOLTS

9.8 N-m (1.0 kgf-m, 7.2 Ibf-ft)

Use a Torx T30 bit.

Replace.

SRS MAIN HARNESS

18P CONNECTOR

TORX BOLTS

9.8 N-m (1.0 kgf-m, 7.2 Ibf-ft)

Use a Torx T30 bit.

Replace.

9. Connect the SRS main harness 18P connector to the

SRS unit, then push it into position until it clicks.

10. Reinstall the radio panel bracket and radio panel

assembly.

11. Reinstall the dashboard center trim and center con-

sole.
12. Reconnect the driver's airbag 2P connector to the

cable reel 2P connector, and reinstall the access

panel on the steering wheel.

13. Reconnect the front passenger's airbag connector

to the SRS main harness, then reinstall the glove

box.

14. Reconnect the battery positive cable, then the nega-

tive cable.

15. After installing the SRS unit, confirm proper system

operation: Turn the ignition switch ON (II); the SRS

indicator light should come on for about six sec-

onds and then go off.

16. Enter the anti-theft code for the radio, then enter the

customer's radio station presets.ProCarManuals.com

Engine Removal/Installation

Removal

• Make sure jacks and safety stands are placed properly

and hoist brackets are attached to the correct positions

on the engine.

• Make sure the car will not roll off stands and fall

while you are working under it.

CAUTION:

• Use fender covers to avoid damaging painted sur-

face.

• Unplug the wiring connectors carefully while holding

the connector portion to avoid damage.

• Mark all wiring and hoses to avoid misconnection.

Also, be sure that they do not contact other wiring

or hoses or interfere with other parts.

1. Secure the hood open as far as possible.

2. Make sure you have the anti-theft code for the radio,

then write down the frequencies for the radio's pre-

set buttons.

3. Disconnect the battery negative terminal first, then

the positive terminal.

4. Remove the engine ground cables and ignition coil

wire.

IGNITION COIL

WIRE

GROUND

CABLES
6 x 1.0 mm

9.8 N-m (1.0 kgf-m,

7.2 Ibf-ft)
5. Remove the battery, then remove the heat shields.

6 x 1.0 mm

9.8 N-m (1.0 kgf-m, 7.2 Ibf-ft)

HEAT

SHIELDS

6. Remove the battery base.
6 x 1.0 mm

9.8 N-m (1.0 kgf-m,

7.2 Ibf-ft)

8 x
1.25
mm

22 N-m (2.2 kgf-m, 16 Ibf-ft)

BATTERY

BASEProCarManuals.com

Engine Coolan t Refillin g an d Bleedin g
CAUTION : Whe n pourin g engin e coolant , b e sur e t o
shu t th e rela y bo x li d an d no t t o le t coolan t spil l o n th e
electrica l part s o r th e paint . I f an y coolan t spills , rins e it
of f immediately .
NOTE:
• Perfor m thi s procedur e whe n th e engin e i s cool .
• Befor e replacin g th e coolant , tur n th e ignitio n O N (II) ,
slowl y tur n th e climat e contro l temperatur e kno b t o
90 ° an d tur n of f th e ignition . Thi s wil l allo w th e
coolan t i n th e heate r t o drai n ou t wit h th e res t o f th e
system .
1.Whe n th e radiato r i s cool , remov e th e radiato r cap .
Loose n th e drai n plug , an d drai n th e coolant .
Remov e th e drai n bol t fro m th e righ t sid e o f th e
cylinde r bloc k t o drai n th e block .
DRAIN PLU G
DRAI N BOL T59 N- m (6. 0 kgf-m ,
4 3 Ibf-ft )WASHE RReplace.
3. Appl y liqui d gaske t t o th e drai n bol t threads , the n
reinstal l th e bol t wit h a ne w washe r an d tighte n i t
securely .
4. Tighte n th e radiato r drai n plu g securely .
5 . Remove , drai n an d reinstal l th e reservoir . Fil l th e
tan k halfwa y t o th e MA X mar k wit h water , the n u p
t o th e MA X mar k wit h antifreeze .
6 . Mi x th e recommende d antifreez e wit h a n equa l
amoun t o f wate r i n a clea n container .
NOTE:
• Us e onl y genuin e Hond a antifreeze/coolant .
• Fo r bes t corrosio n protection , th e coolan t con -
centratio n mus t b e maintaine d year-roun d a t
50 % minimum . Coolan t concentration s les s tha n
50 % ma y no t provid e sufficien t protectio n
agains t corrosio n o r freezing .
• Coolan t concentration s greate r tha n 60 % wil l
impai r coolin g efficienc y an d ar e no t recom -
mended .
7.
8.
9 .
CAUTION :
• D o no t mi x differen t brand s o f antifreeze/coolants .
• D o no t us e additiona l rus t inhibitor s o r anti-rus t
products ; the y ma y no t b e compatibl e wit h th e
coolant.
Engin e Coolan t Refil l Capacit y [includin g reservoi r
(0.7 (0. 7 U S qt , 0. 6 Im p qt))] :
5.2 (5. 5 US qt , 4. 6 Im p qt )
Loose n th e ai r blee d bolt s i n th e thermosta t hous -
in g an d intak e manifold , the n fil l th e radiato r t o th e
botto m o f th e fille r nec k wit h th e coolan t mixture .
Tighte n th e blee d bolt s a s soo n a s coolan t start s t o
ru n ou t i n a stead y strea m withou t bubbles .
BLEED BOLT S9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
With th e radiato r ca p off , star t th e engin e an d le t i t
ru n unti l warme d u p (radiato r fa n come s o n a t leas t
twice) . Then , i f necessary , ad d mor e coolan t mi x t o
brin g th e leve l bac k u p t o th e botto m o f th e fille r
neck.
Put th e radiato r ca p o n tightly , the n ru n th e engin e
agai n an d chec k fo r leaks .
ProCarManuals.com

II. Engine Control Module (ECM) Reset Procedure

Either of the following actions will reset the ECM.

• Use the OBD II scan tool or Honda PGM Tester to clear the ECM's memory.

NOTE: See the OBD II scan tool or Honda PGM Tester user's manuals for specific operating instructions.

• Turn the ignition switch OFF. Remove the BACK UP RADIO (10 A) fuse from the under-hood fuse/relay box for

10 seconds.

BACK UP RADIO

(10 A) FUSE

UNDER-HOOD

FUSE/RELAY

BOX

III. Final Procedure (this procedure must be done after any troubleshooting)

1. Remove the SCS Service Connector if it is connected.

NOTE: If the SCS service connector is connected and there are no DTCs stored in the ECM, the MIL will stay

on when the ignition switch is turned ON (II).

2. Do the ECM Reset Procedure.

3. Turn the ignition switch OFF.

4. Disconnect the OBD II scan tool or Honda PGM Tester from the Data Link Connector (16P).ProCarManuals.com

Data
Description

Operating Value
Freeze Data

HO2S

Feedback

Loop Status
Loop status is indicated as "open" or "closed".

Closed: Based on the HO2S output, the ECM deter-

mines the air/fuel ratio and controls the amount of

injected fuel.

Open: Ignoring HO2S output, the ECM refers to signals

from the TP, MAF, and ECT sensors to control the

amount of injected fuel.
At idle speed: closed

Short Term

Fuel Trim
The air/fuel ratio correction coefficient for correcting

the amount of injected fuel when H02S feedback is in

the closed loop status. When the signal from the H02S

is weak, short term fuel trim gets higher, and the ECM

increases the amount of injected fuel. The air/fuel ratio

gradually gets richer, causing a higher HO2S output.

Consequently, the short term fuel trim is lowered, and

the ECM reduces the amount of injected fuel. This

cycle keeps the air/fuel ratio close to the stoichiometric

ratio when in closed loop status.
±20%

Long Term

Fuel Trim
Long term fuel trim is computed from short term fuel

trim and indicates changes occurring in the fuel supply

system over a long period.

If long term fuel trim is higher than 1.00, the amount of

injected fuel must be increased. If it is lower than 1.00,

the amount of injected fuel must be reduced.
±20%

Intake Air

Temperature

(IAT)
The IAT sensor converts intake air temperature into

voltage and signals the ECM. When intake air tempera-

ture is low, the internal resistance of the sensor

increases, and the voltage signal is higher.
With cold engine:

Same as ambient temper-

ature and ECT

Throttle

Position
Based on the accelerator pedal position, the opening

angle of the throttle valve is indicated.
At idle speed:

approx. 10%

Ignition

Timing
Ignition timing is the ignition advance angle set by the

ECM. The ECM matches ignition timing to the driving

conditions.
At idle speed: 15° ±2°

BTDC with the SCS service

connector connected.

Calculated

Load Value

(CLV)
CLV is the engine load calculated from the MAF data.
At idle speed:

14-27%

At 2,500 rpm with no load:

13-26%ProCarManuals.com

PGM-FI System

System Description

INPUTS
ENGINE CONTROL MODULE (ECM)

OUTPUTS

Fuel Injectors

PGM-FI Main Relay (Fuel Pump)

MIL

IAC Valve

A/C Compressor Clutch Relay

Radiator Fan Relay

Condenser Fan Relay

ALT

ICM

EVAP Purge Control Solenoid

Valve

Primary HO2S Heater

Secondary H02S Heater

EGR Control Solenoid Valve

IAB Control Solenoid Valve

EVAP Bypass Solenoid Valve*2

EVAP Control Canister Vent Shut

Valve*2

*1: '95-96 models

*2: '97 - 98 models

PGM-FI System

The PGM-FI system on this model is a sequential multiport fuel injection system.

Fuel injector Timing and Duration

The ECM contains memories for the basic discharge durations at various engine speeds and manifold air flow rates. The

basic discharge duration, after being read out from the memory, is further modified by signals sent from various sensors

to obtain the final discharge duration.

Idle Air Control

Idle Air Control Valve (IAC Valve)

When the engine is cold, the A/C compressor is on, the transmission is in gear, the brake pedal is depressed, the P/S load

is high, or the alternator is charging, the ECM controls current to the IAC Valve to maintain the correct idle speed.

Ignition Timing Control

• The ECM contains memories for basic ignition timing at various engine speeds and manifold air flow rates. Ignition

timing is also adjusted for engine coolant temperature.

• A knock control system is also used. When detonation is detected by a knock sensor (KS), the ignition timing is retarded.

Other Control Functions

1. Starting Control

When the engine is started, the ECM provides a rich mixture by increasing fuel injector duration.

2. Fuel Pump Control

• When the ignition switch is initially turned on, the ECM supplies ground to the PGM-FI main relay that supplies

current to the fuel pump for two seconds to pressurize the fuel system.

• When the engine is running, the ECM supplies ground to the PGM-FI main relay that supplies current to the fuel pump.

• When the engine is not running and the ignition is on, the ECM cuts ground to the PGM-FI main relay which cuts

current to the fuel pump.

3. Fuel Cut-off Control

• During deceleration with the throttle valve closed, current to the fuel injectors is cut off to improve fuel economy at

speeds over 1,250 rpm.

• Fuel cut-off action also takes place when engine speed exceeds 7,100 rpm, regardless of the position of the throttle

valve, to protect the engine from over-revving.
CKP/TDC/CYP Sensor

CKF Sensor

MAF Sensor

ECT Sensor

IAT Sensor

TP Sensor

EGR Valve Lift Sensor

Primary HO2S

Secondary H02S

VSS

BARO Sensor

ELD

Front KS

Rear KS

Starter Signal

ALT FR Signal

Air Conditioning Signal

A/T Gear Position Signal

Battery Voltage (IGN.1)

Brake Switch Signal

PSP Switch Signal

EVAP Purge Flow Switch*1

Fuel Tank Pressure Sensor*2ProCarManuals.com

PGM-FI System

Engine Control Module (ECM)

Is the low oil pressure light on?

Try to start the engine.

Does the engine start?

Check for an open in the wire or

bulb (MIL line):

1. Turn the ignition switch OFF.

2. Connect the ECM connector ter-

minal A7 to body ground with a

jumper wire.

3. Turn the ignition switch ON (II).
NOTE: If this symptom is intermittent, check for a loose fuse No. 1 (BACK UP

LIGHTS, METER LIGHTS, 10 A) in the under-dash fuse/relay box, a poor con-

nection at ECM terminal A7, or an intermittent open in the GRN/RED wire

between the ECM (A7) and the gauge assembly.

Is the MIL on?

Substitute a known-good ECM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
ECM.
— Repair short in the wire

between NO. 1 (BACK-UP

LIGHTS, METER LIGHTS) (10

A) fuse and gauge assembly.

— Replace No. 1 (BACK-UP

LIGHTS, METER LIGHTS) (10 A)

fuse.

Check for an open in the wires

(PG1, PG2 lines):

1. Turn the ignition switch ON (II).

2. Measure voltage between

body ground and ECM con-

nector terminals A12 and A25

individually.

Is there less than 1.0 V?

Repair open in the wires

between ECM (A7) and gauge

assembly.

Replace the MIL bulb.
ECM CONNECTOR A (26P)

Wire side of female terminals

Repair open in the wire(s)

between ECM and G101 (located

at left side of engine) that had

more than 1.0 V.

ECM CONNECTOR A (26P)

Wire side of female terminals
The Malfunction Indicator Lamp

(MIL) never comes on (even for

two seconds) after ignition is

turned on.

Turn the ignition switch ON (II).

JUMPER WIREProCarManuals.com

Before connecting a new fuel tube/quick-connect fitting

assembly, remove the old retainer from the mating pipe.

With the

tabs pulled

apart, pull

the retainer

off

New FUEL TUBE/

QUICK-CONNECT

FITTING ASSEMBLY

3. Align the quick-connect fittings with the pipe, and

align the retainer locking pawls with the connector

grooves. Then press the quick-connect fittings onto

the pipe until both retainer pawls lock with a click-

ing sound.

NOTE: If it is hard to connect, put a small amount of

new engine oil on the pipe end.

Connection with new retainer:

CONNECTOR

RETAINER

PIPE

CONNECTOR

RETAINER

PIPE
4. Make sure the connection is secure and the pawls

are firmly locked into place; check visually and by

pulling the connector.

Pull apart.

CONNECTOR

RETAINER

PIPE

Reconnect the battery negative cable, and turn the

ignition switch ON (II) the fuel pump will run for about

two seconds, and fuel pressure will rise. Repeat two

or three times, and check that there is no leakage in

the fuel supply system.

Reconnection to existing retainer:ProCarManuals.com