1994 HONDA INTEGRA Dash

PGM-FI System
Engine Control Module (ECM)
lB18B1 ongino onlyl
The Malfunction Indicator Lamp(MlL) n6v6. com6s on lovon follwo socondal aftor ignition istumed on.
lurn the ignition switch ON.
Inspect No. 15 {BACK-UP LIGHT}l1O A) luse in the underdashtuse/relay box.ls the low oil pressure light on?
- R€placo No. 'l5
IBACK-UP LIGHT)llo Al fuso.- Ropair short inYEL wiro botwoonNo. 15 (BACK-UP
LIGHT) {10 A) fusoano gauge 6$om-blv.
Turn lhe ignition switch OFF.
ls the fuse OK?
Connecl the test harness betweenthe ECM and connectors (seepag€ 11-37).Repair opon in YEL wiio botw6onNo.'15 IBACK-UP LIGHTI 110 A)luso and gaug6 assombly.
Turn the ignition switch ON.
- RsDlaco tho MIL bulb.- Ropair opon in GRN/ORN wi.ebetwoen ECM {A13} andgaug€ a$6mbly.
ls the MIL on?
Measure voltage between body
Oround and the tollowing termi-nafs individuallv: 423, 424.
Ropah op6n in BLK wirolsl bo-tw6en ECM and GlOl llocatod atthormostat housing) that hadmoro than 1.0 V.
ls there less than 1.O V?
Substituto a known-good ECMand rochgck, lf symptom/indica-tion go€s away, roplaco tho origi-nal ECM.
NOTE: lf this svmptom is intermittent. check for a loose fuse No. 15 (BACK
UP LIGHT, 1OA) in the under-dash Juse/relay box, a poor connection at ECM
terminal A13, or an intermittent open in the GRN/ORN wire between the ECM(A13) and the gauge assembly.
I A13
I| | o oooo oooooooo I oooo oooo I ooooool ooooooooooo I
G 10'l
11-42

Th. ll.lfunction Indicltor Lamp
lMlll at!y3 on o. cornaa on alt6ltwo aacond!.
Connect the SCS short connectorto th6 sorvice check connector(see page 11-34).
Turn the ignition switch ON.
Go to iolfdiagnostic Proceduros(se€ pago 11-34).Does the MIL indicate anv Oi-agnostic Trouble Code (DTC)?
Romove th€ SCS shon connectorlrom the service ch€ck connector.
Turn the ignition switch OFF.
Try to start the engine.
Connect the test harness betweenthe ECM and connectors (see
page 11-37).
Turn the ignition switch ON.
Measure voltage botween D4 (+ )terminal and D22 { - ) terminal.
connect the SCS shonconnector to servlcecheck connector.ls there approx. 5 V?
Ropair shon to body g.ound inBRN/WHT wire betwoon th6 ECMlD4) end sorvlco chock connocto?.Measure voltage be_tween D4 {+} terminaland body ground.
- R6pair open in BRN/WHT witobotwoon EcM lD4) and s6rv-ice chock connactor.- Repoir opon in BLK wiro bo-twoon 36rvi@ chock connectoaand G4Ol.
ls there approx. 5 V?
InsDoct ECU {ECM) 115 A) tuse inth6 undeFhood luse/relav box.
- Rsolaco ECU {ECM} (15 Allus€.- R6pair shon in YEL/WHT wilobotw6on ECU lEcMl 115 A)fuso and PGM-FI main rolay.
Remove the scs shortConnector from theservice check con-nector.
ls the luss OK?
NOTE:
a When there is no code stored, the MIL willstay on if the service check con-
nector is shorted.
a tf this svmotom is intermittent, check for:
- A loose ECM fuse (15A) in the under-hood tuse/relay box
- A loose No. 24 fuse (ACG) (ALT) ( 1 5A: B1 8B 1 engine, 2OA: B18C 1 en-
gine) in the under-dash fuse/relay box- An intermittent short in the BRN/WHT wire between the ECM (D4) and
the service check connector- An intermittent oDen in the BLK wire between the service check con-
nector and G4O1- An intermittent shon in the GRN/ORN wire between the ECM (A 13) and
the gauge assembly.- An intermittent short in the YELMHT wire between the ECM (D19) and
the MAP sensor- An intermittent short in the YEL/BLU wire between the ECM (D20) and
the TP sensor
o ooooo ooo ooo o loooooooo liii:$A$.Ps,l o oo ooo ooooo
o oooo ooo o o ooo I oooooooooooooooooo
D4 (+)
l"oo,o'.
D22 t-l
uu,l
'NOTE: After repair, disconnect the SCS ShortConnsctor, test drive the car, and recheckthe MIL
lor a code.
(cont'd)
(To page 1 'l -44)lTo page 1 1-44)
11-43

(From page 1 1-43)
Inspect the No. 24ACG {ALT) (lG)(15 A: 81881 engine, 2OA:818C1 enginel fuse in the under-dash fuse/relav box.
- R.pllr .hon in BLK|rEL wlr6batr.v€qr undariair luro/Fbybox lnd FGM-FI m.in .obv.- noebco lto. 24 ACG {lG) nLT)(15 A: 81881 ongin., 2OA:Bl8Cl onein.l tu!6.
ls the fuse OK?
Turn the ignition switch ON.
Disconnect the 3P connector oteach sensor one al a time:. MAP sensor. TP sensor
Rcplaoo thg lgnlor that caur6dth. llght to Oo out.Does the MIL remain ON?
Turn the ignition switch OFF.
connect the test harness.Disconnect the "D" connectorfrom th€ ECM only, not the mainwire harness (see page 11-37).
Check tor continuity betweenbody ground and D19, O2O ter-minals,
- Bapai? rhod ro body g.ound inYEL/WHT wi.e boiwoon ECM(Dl9) .nd MAP ..n3or.- R.p!k shon to body ground inYEL/BLU wire b.lwo6n ECM(O2Ol .nd TP 3on!or.
Reconnect all tho sensor con-necrors,Reconnect the "D" connector torhe ECM.
Turn the ignition switch ON.
{To page 11-45}
System
Control Module (ECMI (cont'dl
PGM-FI
Engine
Dt9I
I oooooooooo ooo I oooooooo I omoool o oooooooooo | |I ooooooooooooo I oooooooo 1o('oe(lo I ooooooooooo | |-lD2O I
\-.J
Continuity?
(From page 11-43)
Disconnect "A" con-nector from the ECM.
Subrtltute r knowngood ECM.nd rochock. ll lymptom/indics-tlon g@a rw!y, rephco tho origi-n.l ECM.
ls the MIL ON?
Ropair short to bodygiound in GRN/ORNwir6 botwoon tho ECMlA131 6nd MlL.
11-44

ldle Gontrol System
Startel Switch Signal
This signals the ECM when the engine is cranking.
BATTERYVOLTAGE?
NOTE:a M/T: Clutch pedal must beoeprgsseo.a A/T: Trsnsmission in lll or LIJ position.
11-92
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oooooooooooo
A26 {-}Connect the lest harness botweenthe ECM and connector (see page
11,37).
Measure voltage between 89 (+)
terminal and 426 (-) terminalwith the ignition switch in thestart position.
Inspect No. 18 STARTER SIGNAL{7.5 A) fuse in the under-dashfuse/relav box.ls there batterv voltage?
- Roplac. No. 18STARTER SIG AL(7.5 A) lurc,- Rrpsir lhort In BLU/WHT wir. batwccnECM (89) .nd No.18 STARTER SIG.t{AL {7.5 Al 1u..,PiGM-Fl fi.ln rol.y.
R.palr opon in BLU/WHT wir6 b6-tw€.n ECM lB9l and t{o, 18STARTER SIGNAL 17.5 Al lu.o.
Startor .witch .ign.l is OK.

Fuel Supply System
PGM-Fl Main Relay (cont'dl
BLU
BLU/wHt
Bt-xNOTE:. M/T: Clutch pedal mustbe depressed.. A/T: Transmission in
N or E] position.
BLK/ YEL/YEL BLK
Tloubloshooting
{To page 11 113}
- Engino will not sran.- Inspection oI PGM-FI main re-lay and rolay ha.n6!a.
Check lor continuitv between BLKterminal @ and body ground.
Rapair open in BLK wire botwoonPGM-FI main.el6y and GIO'l llo-catod at thormostot housingl.
Measure the voltage betweenYELMHT terminal @ and bodyground.- Roplaco th. ECU IECMI(15 Allus6 in tho under-hood fu!o/r6-lay box.- Ropair opan or short in theYEL/WHT wil6 botwosn thePGM-FI main rolay and the ECU
{EcMl 115 A} luso.
ls there battery voltage?
Turn the ignition switch ON.
Measure the voltage betweenBLK/YEL terminal @ and bodyground.- Reolac. ths No. 24 ACG {ALT}{lcl {15 A:81881 6ngino, 20A: Bl8Cl engin6) tuse in thoundor-dash fuso/rolaY box.- Ropaii op6n or rhon in thoBLK/YEL wiro botwoen thoPGM-FI main ielay and th€ No.24 ACG {ALT) flG} {'15 A:818Bi ongine, 20 A: 818Cionginol fuso.Turn the ignition switch to theSTART position.
Measure the voltage betweenBLUMHT terminsl @ and bodyground.
- Replaco the l\lo. 18 STARTERSIGNAL {7.5 A} fuso in thoundor-dash fuaa/rolay box.- R6pai. open or short in thoBLU/WHT wire botweon thsPGM-FI main relay and tho No.1A STARTER SIGNAL I7.5 AIluse.
11-112

The Automatic Transmission is a combination of a 3-e,ement torque convefter and triple-shaft electfonically controlled
automatic transmission which provides 4 speeds forward and 1 speed reverse. The entire unit is positioned in line with
the engine.
Torque Converter, Gears and Clutches
The torque converter consists of a pump, turbine and stator assembly in a single unit, The torque converter is connected
to the engine crankshaft so they turn together as a unit as the engine turns. Around the outside of the torque converter
is a ring gear which meshes with the starter pinion when the engine is being staned. The entire torque converter assem-
bly serves as a flywheel while transmitting power to the transmission mainshaft.
The transmission has three parallel shafts, the mainshaft. countershaft and sub-shaft. The mainshatt is in line with the
engine crankshaft.
The mainshaft includes the clutches for 1 st, and 2ndl4th, and gears for 3rd. 2nd, 4th, reverse and l st (3rd gear is in-
tegral with the mainshaft, while reverse gear is integral with the 4th gear).
The countershaft includes the 3rd clutch and gears Ior 3rd, 2nd,4th, reverse, lst and parking. Reverse and 4th gears
can be locked to the countershaft at its center, providing 4th gear or reverse, depending on which way the selector is moved.
The sub-shaft includes the lst-hold clutch and gears for 1st and 4th
The gears on the mainshait are in constant mesh with those on the countershaft and sub-shaft. When certain combina-
tions of gears in the transmission are engaged by the clutches, power is transmitted from the mainshaft to the counter-
shaft via the sub-shatt to provide @, E, tr. tr and @ position.
Electronic Control
The electronic control system consists of the Transmission Control Module {TCM), sensors, and 4 solenoid valves. Shift-
ing and lock-up are electronically controlled for comfortable driving under all conditions.
The TCM is located below the dashboard, behind the left side kick panel on the driver's side.
Hydraulic Control
The valve bodies include the main valve body, secondary valve body, regulator valve body. servo body, and lock-up valve
body throuqh the respective separator plates.
They are bolted on the torque converter housing.
The main valve body contains the manual valve, 1-2 shift valve, 2-3 shift valve, Clutch Pressure Cont.ol (CPC) valve,
4th exhaust valve, relief valve, and oil pump gears.
The secondary valve body contains the 4-3 kick-down valve,3-2 kick-down valve,2-3 orifice cont.ol valve, 3-4 shitt
valve, orifice control valve. modulator valve, and servo control valve
The regulator valve body contains the pressure regulator valve. lock-up control valve, torque converter check valve, and
cooler check valve.
The servo bodv contains the servo valve which is integrated with the reverse shift fork, throttle valve B, and accumulators.
The lock-ug valve bodv contains the lock-up shift valve and lock-up timing B valve. and is bolted on the secondary valve
body.
Fluid from the regulator passes through the manual valve to the various control valves.
Shitt Control Mochanism
Input to the TCM i.om various sensors located throughout the car determines which shift control solenoid valve should
be activated.
Activating a shift control solenoid valve changes modulator pressure, causing a shift valve to move. This pressurizes
a line to one of the clutches. engaging that clutch and its corresponding gear.
Lock-up Mechanism
In @ position. in 2nd, 3rd and 4th, and E position in 3rd, pressurized tluid can be drained from the back of the tor-
que converter through an oil passage, causing the lock-up piston to be held against the torque converter cover. As this
takes Dlace, the mainshaft rotates at the same speed as the engine crankshatt. Together with hydraulic control, the TCM
optimizes the timing ol the lock-up mechanism.
The lock-up valves control the range of lock-up according to lock-up control solenoid valves A and B, and throttle valve B
When lock-up control solenoid valves A and B activate, modulator pressure changes. Lock-up control solenoid valves
A and B are mounted on the torque converter housing, and are controlled by the TCM.
(cont'd)
14-3

Description
Electronic Control System
Electronic Control System
The electronic control system consists of the Transmission Control Module (TCM), sensors. and 4 solenoid valves. Shift-
ing and lock-up are elect.onically controlled for comfortable driving under all conditions.
The TCM is located below the dashboard, behind the left side kick panel on the driver's side.
Lock-up ControlSolonoid Valvo A
14-18

Troubleshooting Procedures
when the TcM senses an abnormality in the input or output systems. the E]indicator light in the gaugo assembly willblink.
when the service check Connector {located under the dash on the passenger side} is connected with the specaat toolas shown, the E] indicator light will blink the Diagnostic Trouble iode {DTCI when the ignition switch is turned on.
When the lDil indicator light has been reported on, connect the service check connector with the special tool.Then turn on the ignition switch and observe the @ indicator light.
GAUGE ASSEMSLY
)'t
DAI'A LI]TKcor{r{EcToR (3P)NOTE:Do not atlachjumpe. wire.
Sc. DTCI
So. DTC2
S.. DTC14
scs sHoRT CO[{]{ECTORoTPAZ-OOl0too
codes 1 through I are indicated by individual short blinks, codes 1o through 1 5 are indicated by a series of tong andshon blinks. one long blink equals l0 short blinks. Add the long and short blinks together to dete;mins the cod€. Aft6rdetermining the code, refer to the erectricar system symptom-to-component chart on pages 14-5o and 51.
ahon
f"l
some PGM-FI problems will also make the @ indicator light come on. After repairing the pGM-Fr system, disconnectthe BACK UP tuse (7.5 Al in the under-hood fuse/relay box tor more than 1o seconds to reset the TcM memorv.
NOTE:
a PGM-FI svstem
The PGM-FI system on this model is a sequential multipon fuel iniection svstem.' Disconnecting the BACK UP tuse also cancels the radio anti-theft code, preset stations and the clock setting. G6tthe customer's code numbe. and make note of the radio presets befote temoving the fuse so you can reset them.
14-48