ECU HONDA INTEGRA 1994 4.G Repair Manual

Five-step Troubleshooting
1. Verify The Complaint
Turn on all the components in the problem circuit to
verify the customer complaint. Note the symptoms.
Do not begin disassembly or testing until you have
narrowed down the Droblem area.
2. Analyze The Schomatic
Look up the schematic for the problem circuit. De-
termine how the circuit is supposed to work by trac-
ing the current paths from the power leed through
the circuit components to ground. It severalcircuits
fail at the same time, the luse or ground is a likely
cause.
Based on the symptoms and your understanding of
the circuit operation, identity one or more possible
causes of the Droblem.
3. lsolato The Problom By Testing The Circuit
Make circuit tests to check the diagnosis you made
in step 2. Keep in mind that a logical, simple proce-
dure is the key to etticient troubleshooting. Test for
the most likely cause of failure first. T.y to make
tests at points that are easilv accessible.
4. Fix The Problem
Once the specilic problem is identified, make therepair. Be sure to use proper tools and safeproceoures.
5. Mak6 Suro The Circuit Wolks
Turn on all components in the repaired circuit in allmodes to make sure you've fixed the entire problem.
It the problem was a blown Juse, be sure to test allof the circuits on thst tuse. Make sure no newproblems turn up and the original problem does not
recuf.
23-5

Connector ldentification and Wire Harness Routing
Msin Wiie Harness (Left branch)
Connector or
Terminal
Numbel ot
CavitiesLocationConnects toNotes
c411
c412
c413
c414
c415
c416
c4'17
c418
c419
c420
c42'l
c423
c424
c425
c426
c427
c42A
c429
c430
c431
c43l
c432
c433
c434
c435
c436
c437
c438
c439
c440
c44'l
c442
c443
c444
c445
c446
c447
c448
c449
26
10
20
20
14
8
4
I
14
20
22
't4
4
2
10
4
7
4
o
7
I
7
22
6
4
7
4
15
to
Center floor
Center floor
Center floor
Under left side ot dash
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Under left side of dash
Under left side of dash
Under lett side of dash
Under left side ot dash
Under lett side of dash
Under lett side of dash
Under lett side of dash
Under lett side of dash
Under lett side ot dash
Under left side of dash
Under left side ol dash
Under left side of dash
Under left side of dash
Under left side of dash
Under left side of dash
Under left side of dash
Behind dashboard lower cover
Behind dashboard lower cover
Behind dashboard lower cover
Under left side of dash
Under left side of dash
Under left side of dash
Under lett side of dash
Under left side of dash
Behind under-dash fuse/relay box
Under left side ot dash
Behind dashboard lower cover
Behind dashboard lower cover
A/T gear position console light
Shift lock solenoid
A/T gear position switch
Interlock control unit
Daytime running lights control unit
Daytime running lights control unil
Cruise control unit
Junction connector
Transmission control module
(TCM)
Transmission controi module
{TCM)
Rear wire harness (C501)
Rear wire harness {C502)
Engine compartment wire harness
(c301)
Engine compartment wire harness
(c302)
Roof wire harness (C663)
Security system (Option)
SRS main harness (C802)
Clutch interlock switch
Clutch switch (Cruise control)
Dashboard wire harness (C552)
Brake switch (Without cruise
control)
Brake switch (With cruise control)
lgnition switch
Security system (Option)
Combination light switch
Combination light switch
Combination light switch
Combination light switch
Under-dash fuse/relay box {C9131
Under-dash fuse/relay box {C9161
Underdash tuse/relay box (C9'l 7l
Security system (Option)
Security system {Option)
PGM-FI main relay
Starter cut relay
Rear window defoqger relay
Integrated cont.ol unit
Security system {Option)
Horn relay
Dashboard wire harness (C553)
Afi
AiT
Afi
Afi
Canada
Canada
Arf
An
Canada
Canada
M/T
M/T
Atr
Canada
Canada
M/T
Canada
G401Behind left kick panelBody ground, via main wire
harness
23-26

- Dash sensors- Cable reel- SRS unit
General Precautions
Carefully inspect any SRS part before you install it.Do not install any part that shows signs of beingdropped or improperly handled, such as dents, cracksor deformation:
- Airbag assembly {driver's and front passenger's)
Airbag Handling and Storage
Do not try to disassemble the airbag assembly. lt has noserviceable parts. Once an airbag has been operated(deployed), it cannot be repaired or reuseo.
For temporary storage of the airbag assembly duringservice, please observe the following precautions:
. Store the removed airbag assembly with the pad sur-face up.
!@ It the airbag is impropsrty stored facsdown, accidental deployment could propel the unit withenough force to cause setious iniury
Store the removed airbag assembly on a secure flatsufface away from any high heat source (exceeding
212"Fl1OO'Cl and free of any oil. grease, detergent or
CAUTION: lmproper handling or storage can internallydamage the airbag assembly, making it inoperativ€.ll you suspect the airbag assembly has been damagod,install a new unit and rgler to the Deployment/DigposalProcedures lor disposing of the dsmaged airbag.
Use only a digital multimeter to check the system. lfit's not a Honda multimeter make sure its output is 10mA (0.01 A) or less when switched to the smallestvalue in the ohmmeter range. A tester with a higheroutput could damage the airbag circuit or cause accidental deployment and possible injury.
Do not install used SRS parts from another car. Whenmaking SRS repai.s, use only new pans.
Except when performing electrical inspections,always disconnect both the negative cable and posi-
tive cable at the battery before beginning work.
Replacement of the combination light andwiper/washer switches and cruise control switch canbe done without removing the steering wheell
- Combination light and wiper/washer switchreplacement (see page 23-160).- Cruise control sevresume switch replacement {seepage 23-2491 .
The original radio has a coded theft protection circuit.Be sure to get the customer's code number beforedisconnecting the battery.
When reinstalling the SRS unit cover, be sure it snapstogether properly.
SHORT CONNECTON {REDI
23-271

Supplemental Restraint System (SRSI
Wiring Precautions
o Never attempt to modify. splice or repair SRS wiring.
NOTE: All SRS electrical wiring harnesses are covered
with yellow insulation.
Be sure to install the harness wires so that they are
not pinched or interfering with other car pans.
Make sure all SRS ground locations are clean and
grounds are securely fastened for optimum metal-to-
metal contact. Poor grounding can cause intermittent
problems that are difficult to diagnose.
23-272
Connecting the Short Connectors
@ To avoid accident8l deploymont and pos-
5ibl6 iniury, slways insiall the protectiva short connec-
tor(s) on tho drivgr'3 and passengor's airbag connec.
tor(s) be{ore working noar any SRS wiring.
NOTE: The original radio has I coded theft protection
circuit. Be sure to get the customer's code number
before disconnecting the battery cables.
1. Disconnect the battery negative cable. then discon-
nect the Dositive cable.
2. Connect the short connector(s) {RED):
Driver's Side:
. Remove the access panel from the steering wheel.
then remove the short connector (RED) from the
Daner.
DRIVER'SAIRBAG
CONNECTORIREDI
Disconnect the 3-P connector between the driver's
airbag and cable reel, then connect the short connec-
tor {RED} to the airbag side oi the connector.

Sensor Inspection
CAUTION: Tak€ €xtra care whon painting or doing
body work in the ar€a bslow th6 dalhboard.
Avoid dirost exposure ot lh6 sonsors or wiring to hestguns, wolding, or spraying equipmont.
Di3connact both the nogativo and po3itivo b!ftery
cable3.
Connsct tho short conneclor(s) before working
bslow the da3hboard or nsar lhe dash sen3o.3.
After any degree of frontal body damage, inspect
both dash sensors. Replace a sensor if it is dented,
cracked, or deformed.
DASH SENSOR
a Be sure the sensors are installed securelv,
Inspection After Deployment
After a collision in which the airbags were deployed.
inspect the following:
1. Inspect the dash sensors for physical damage.
lf the sensors are damaged, replace them.
2. Inspect all the SRS wire harnesses, ReDlace, don'trepair, any damaged harnesses.
3. Inspect the cable reel for heat damage. lf there is
any damage. replace the cable reel.
4. After the car is completely repaired. turn the igni-tion switch on. lf the SRS indicator light comes onfor about six seconds and then goes off, the SRS
system is OK. lf the indicator light does not functionproperly, go to SRS Troubleshooting (next page).
BOLTS
23-275

CAUTION: Bo 3uro to in3tsll tho SRS wiring so that it isnot pinchod or intoforing with other car parts.
4. Install the new airbag(s):
Driver's Sido: Place the driver's airbag assembly inthe steering wheel, and secure it with new TORX@bolts.
TORXC BOLT9.8 N'm 11.0 kgt m.7.2lbf.ftl Replace.Uio a TORXO T30 bit
TORXO BOLI9,8 N'm l'1.0 kgf.m,7.2lbtftl Replaco.Us. . TORX6 T30 bit
Front Pa$aogsr's Sid€:
. Place the front passenger's airbag assembly in thedashboard.
Loosely install all four mounting nuts.
Tighten the upper two nuts first, then the lowsr twonuts. Adjust the lower mounting bracket if necessarV.
FRONT PASSENGER'SAIRBAGASSEMALY
UPPERMOUNTING NUTS
LOWERMOUNTING NUTS9.8 N.m (1.0lgtm, t.2lbtftlReolace.
CONNECTORIREDI
{cont'd)
23-297

Supplemental Restraint System (SRSI
Airbag Assembly Disposal (cont'd)
Connect a l2 volt batterv to the tool:
. lf the green light on the tool comes on, th€
airbag igniter circuit is d€fective and cannot
deploy the airbag. Go to Dsmag€d Airbag
Special Procedure.
. lf the red light on the tool comes on, the airbag is
ready to be deployed.
Push the tool's deployment switch. Th6 sirbag
should deploy (deployment is both highly audible
and visibls - a loud noise and raDid inflation of the
bag, followed by slow deflationl.
. lf audible/visible deploym€nt happsns and the
green light on the tool comes on, continus with
this Drocedure.
. lf the airbag doesn't deploy, yet the green light
comes ON, its igniter is dofectiv€. Go to
Damaged Airbag Special Procedure.
@ During deploym€nt, the airbsg assom-
bly can become hot enough to burn you. Wait thirty
minutes after deployment beforo touching the
assemblv.
Dispose of the complete airbag sssembly. No pan
of it can be reused. Place it in I sturdy plastic bag
and seal it securelv.
CAUTION:
Woar a taco shiold lnd glov.s whon hlndling !
doploy.d airbag.
Waeh your hands and rin3a tham wall with
wslor aftor handling r deploycd !irb!g.
23-300
Doploying the Airbag: Out-ot{!r.
NOTE: lf an intsct airbag assembly has been removed
from a scrapped car, or has been found dofective or
damagsd during transit, storage or service, it should bs
dsployed as follows:
@ Porition th6 lirbrg rr:.mbly t.ce up, out-
doo6 on flat ground !t lorrt thirty foot from rny ob3t..
clar or pcoplo.
1. Confirm that the special tool is functioning properly
by following the check procedure on this page or on
the tool box label.
2. Remove the short connector from the airbag con-
nector.
3. Folfow steps 5,6,7, and 8 of the in-car deployment
orocequre.
Dlmlged Airbsg Sp.ci8l Procoduro.
E!@ f rn lirbag crnnot be deploy.d, it rhould
not br trcltcd !s normll scrrp; ii 3hould still bc comid-
ercd a potantillly oxplolivr dcvicc thli cln c!u3a 3ari-
ou3 iniury.
1. lf instslled in a car, follow the removal procedure on
page 23-295.
2. In all cases, make sure a short connector is properly
installed on the airbag conn€ctor.
3. Package the airbag in sxacily the same packaging
that the now replacement part cama in.i[. Mark the outside 0f the box "DAMAGED AIRBAG
NOT OEPLOYED" so it does not get confused with
your parts stock.
5. Contact your Acura District Service Manager for
how and where to return it for disoosal.
Dcploymont Tool: Chcck Procedure.
1. Connect the yellow clips to both switch protector
handles on the tool; connect the tool to a battery.
2. Push th€ operation switch: green means the tool is
OK; red means the tool is faulty.
3. Disconnect the battery and the yellow clips.

Supplemental Restraint System (SRSI
Dash Sensor Replacement (cont'dl
CAUTION:
. Be 3ure to install the harness wires so that theY ars
not pinchcd or interfering with othor car parte.
o Carefully inspest the dash sensors lor signs of boing
dropped or improperly handled,3uch as dents,
cracks or dsformation.
. For the SRS to lunction propotly, ths right and lsft
sensors must be installsd on the propor sidos.
6. Install the sensor securely.
DASH SENSOR
MOUNTING BOLTS8 mm x 1.2522 N.m (2.2 kgf.m, 16lbfftlReplace.
7. Reinstall all other removed parts.
23-306
li
10.
Remove and properly store the short connector{sl,
then reconnect the airbag connector(s) (and rsin-
stallthe glove box).
Reconnect the battery positive cable, then the nega-
tive cable.
After installing the dash sensor, confirm proper sys-
tem operation: Turn the ignition ON (ll): the instru-
ment panel SRS indicator light should come on for
about six seconds and then go off.
Enter the code number to restore radio operation
(see page 23-191)-
11.