Speedometer HONDA CIVIC 1997 6.G Workshop Manual

Troubleshooting
Troubleshooting Procedures (cont,dl
ECM/PCM Data
By connecting the OBD ll scan tool or the Honda pGM Tester to the l6p data link connector (DLC), various data can beretrieved from the EcM/PcM. The items Iisted in the table below conform to the sAE recommended practice.The Honda PGM Tester also reads data beyond that recommended bv SAE.understanding this data wil help to find the causes of intermittent fairures or engine probrems,
NOTE:
' The "operating values" given below are approximate values and may be different depending on the environment andthe individual vehicle.. Unless noted otherwise, "at idle speed,, means idling with the engine completely warmed up, Ay'T in position @ or E],M/T in neutral, and the Ay'C and all accessories turned off.
(
DataDescriptionOperating ValueFreeze Data
Diagnostic
Trouble Code(DTC)
lf the ECM /PCM detects a problem, it will store it as acode consisting of one letter and four numbers.Depending on the problem, an SAE-defined code (poxxx)or a Honda-defined code (Plxxx) will be outDut to therester.
lf no problem is detected,
there is no output.
YES
Engine SpeedThe ECM/PCM computes engine speed from the signalssent from the Crankshaft Position sensor.This data is used for determining the time and amount offuel injection,
Nearly the same as
tachometer indication.YES
Vehicle SpeedThe ECM/PCM converts pulse signals from the VehicleSpeed Sensor (VSS) into speed data.Nearly the same as
speedometer indicationYES
Manifold
Absolute
Pressure {MAP)
The absolute pressure caused in the intake manifold bvengine load and speed.With engine stopped:
Nearly the same as atmo-
spheflc pressure
At idle speed:
24 - 31 kPa (180 - 280
mmHg, 7.1 - 11.0 inHg)
YES
Engine Coolant
Temperature
(ECT)
The ECT sensor converts coolant temperature into volt_age and signals the ECM/PCM. The sensor is a thermistorwhose internal resistance changes with coolant temDera_ture. The ECM/PCM uses the voltage signals from theECT sensor to determine the amount of iniected fuel.
With cold engine:
Same as ambient temper,
ature and IAT
With engine warmed up:
176 - 194.F (80 - 90.C)
YES
Heated Oxygen
Sensor {HO2S)(Primary,
Sensor 1)(Secondary
Sensor 2)
The Heated Oxygen Sensor detects the oxygen contentin the exhaust gas and sends voltage signals to theECI\4/PCM. Based on these signats, the ECM/pCM con_trols the airlfuel ratio. When the oxygen content is high(that is, when the ratio is leaner than the stoichiometricratio), the voltage signal is lower.When the oxygen content is low (that is, when the ratiois richer than the stoichiometric ratio), the voltage signalis higher.
0.0 - 1.25 V
At idle speed:
about 0.1 - 0.9 V
NO(Sensor 1)
1 1-86

Differential
Check lor cracks.
BALL BEARINGCheck for wear and damage.
DIFFERENTIAL
THRUST SHIMSelective part
SPEEDOMETERDRIVE GEAR
10 x 1.0 mm101 N.m (10.3 ksf.m. 74.5 lbt.ftlLeft-hand threads
ffi
FrNAL DRTvEN o*^r'@c'ec'owea'-Zl
BALL BEARINGCheck for wear and damage.
13-30
Backlash Inspection
'1. Place differential assembly on V-blocks, and installboth driveshafts.
OIAL
Measure backlash of both pinion gears.
Standard {New); 0.05 - 0.15 mm {0.002 - 0.006 in)
lf the backlash is not within the standard, reDlacethe differential carrier.
SI

Differential
lllustrated lndex
BOLT10 r 1.0 mm'10'l N'm (10.3 k91.m,74.5 lbf.ftlLeft-hand threads
SET RING, 80 mrrt
FINAL DRIVEN GEARInspect tor excessive wear.Install in this direction.
efef
BALL BEARINGInspect for faulty movement.
DIFFERENTIAL CARRIERInsoect for cracks,
ROLLER,5x10mmSPEEDOMETER ORIVE
GEARlnstall in this direction.
SNAP RINGInstall in this direction.
EALL BEARINGInspect for faulty movement-
-
14-166

Differential
Diff erential Carrier Replacement
L Remove the final driven gear from the differential
carrier.
NOTE: The final driven gear bolts have left-hand
threads.
Pry the snap ring off differential carrier, then remove
the speedometer drive gear and 5 x 10 mm roller.
SNAP RING
3. Install the 5 x l0 mm roller in the differential carrier,
Install the speedometer drive gear with its cham-
fered side facing the carrier. Align the cutout on the
bore of the speedometer drive gear with the 5 x 10
mm roller.
L
14-168,
5. Align the hooked end of the snap ring with the pin-
ion shaft as shown, then install the snap ring in the
differential carrier groovs.
SNAP RINGHooked end Install in this direction.
SPNI G PIN
Install the final driven gear, then tighten the bolts to
the specified torque.
TOROUE: 101 N.m (10.3 kgf'm, 74.5 lbf.ftl
NOTE: The final driven gear bolts have left-hand
threads.
BOLTS10 r 1.O mm1Ol t{.m 11O.3 kgf.m,74.5 lbl.frlLeft-hand rhreads
FINAL DRIVENGEARlnstall in thisdirection.
DIFFERENTIALCARRIER
7. Install a new ball bearing (se€ page 14-157).
Install in this direclon.

JGau ge/lndicator/Terminal
With tachometer;
CONNECTOR "A"
{A/T GEAR POSITION INDICATOR}
Location lndex
CONNECTOR "8"
{GAUGE and INOICATOR)CONNECTOB "C"
CONNECTOR "D"
{ABS INDICATORI
SPEEDOMETER:Indicates 60 km/h at 637 rpm or
60 mph at 1,025 rpm o{thevehicle speed sensor (VSS).
A/T GEAR POSITIONINDICATORSee page 23 149
TACHOMETER:Indicates 100 rpm at200 pulses per minuteol the ignition controlmodule (lCMi.FUEL GAUGEENGINE COOLANT TEMPERATURE (ECT) GAUGE
(cont'd)
23-129
(GAUGE end INDICATORI
A1-----------+816
JlltlllulllllrL
c1 --------->c13
1ililil{ilrL
oooo o 0006^
)og @ @ o^o @ )'l |. o
Fl- - -> F5E1_ _ -->E5D1- --+05
oo/ \oo
Gauge/Sending Unit Test, page 23-142

Gauge Assembly
Gauge/lndicator/Terminal Location Index (cont'd)
Without tachometer:
CONNECTOR "A"
IA/T GEAR POSITION INDICATORICONNECTOR "8"
{GAUGE and INDICATOR}CONNECTOR "C"
(GAUGE and INDICAIORI
CONNECTOR "F"
{SRS INDICATOR)CONNECTOR "D"
{ABS INDICATORI
SPEEDOMETER:Indicates 60 km/h at 637 rpm or60 mph at 1,025 rpm ofthevehicle speed sensor (VSS).
ENGINE COOLANT TEMPERATUFE (ECT) GAUGEA/T GEAR POSITIONINDICATOFSee page 23 149FUEL
A1 ------> 46
----> al4
B1. - --------------->B16
JilililHililil1
C1-- - --------..+C13
JililHililL
Oo_o-o O 0006
lus 0 0 Bu-. )
oo/ \oo
23-130
Gauge/Sending Unit Test, page 23 142

JDisassembly {Without Tachometerl
NOTE: Handle the terminals and printed circuit boards
carefully to avoid damaging them.
SPEEDOMETER MOUNTINGSCREWS (x 4)
A/T GEAR POSITION INDICAMOUNTING SCREWS {x 2l
SRS INOICATORPRINTED CIRCUIT BOARD
ENGINE COOLANT TEMPERATURE {ECT}
GAUGE
ABS INDICATORPRINTED CIRCUIT BOARD
PRINTED CIRCUIT
METER PANEL
FUEL GAUGEMOUNTING SCREWS {x 3)ENGINE COOLANT TEMPERATUR€GAUGE MOUNTING SCREWS {x 3l
A/T GEAR POSITION INDICATOR
PRINTED CIRCUIT BOARD
'a@
.-@--o
o"i^>
Er t
lmwp\
d*re
\*P
\
FUELTest,GAUGEpage 23-142
oOo ,.-'€'-., oOOo -/\
€3,'" ' "$?'----"')
)a.' '.,,'+ ':j
\ll Lto
BOARD
METER LENSMETER VISOR
23-139

J
(From prevaous page)
WHT TEST HARNESSCLIP
TEST HABNESS07LAJ - Plil020aRED TEST HARNESSCLIP
PROTECTIVEAPE
GRN TEST HARNESS CLIP
GAUGE ASSEMBLY 16P CONNECTOR "8"
BLU
23-141
Tost the BLU/WHT wireiConnect lhe GRN test harnessclip to the positive probe of avoltmeter, and connect the RED
test harness clip to the negativeprobe.
Repair open in the BLU/WHT wirob€twoon the VSS and ECM/PCM,TCM (CVT), and cruise control untt.ls there about 5 V or more ?
Test the vss:1. Turn the ignition switch OFF.2. Connect the other test harness connector to the VSS.3. Raise the front ot the vehicle,and support it with safetystands,4. Put the vehicle in neutral with
the ignition switch ON (ll).
5. Slowly rotate one wheel withthe other wheel blocked.
Does voltage pulse from 0 toapprox.5 V or more ?
Speedometer Tosii'1. Disconnect the 16P connector"B" from the gauge assem-blv.2. Touch a probe to the BLUMHTwire, and connect it to bodyground through a voltmeter.
3. Slowly rotate one wheel with
the other wheel blocked.
Repair open in the BLU/WHT wi.ebelween th€ VSS and the 3pe€d-Does the meter indicate puls-
ing voltage?
female terminals

Contents
How to Use This Manual ICircuit Schematics (see Circuit Index)Fuse/Relaylnformation 6Ground-to-Componentslndex 6-6ComponentLocationPhotooraohs 201Conriector Views 202
Circuit Index
Accessory power socket 155Air conditionerAir delivery'96198 models 61'99-'00 models 61-2Blower controls'96198 models 60'99100 models 60-1Compressor controls 62Fans 63Anti-lock brake system (ABS) 44A/T gear position indicatorCVT 89All except CVT 89-1Automatic transmission controlsAll '96-'98 models except CVT and GX 39All '99100 models except CVT 39-8All GX models 39-8'96-'98 CVT 39-4'99100 cw 39-12Back-up lightsCoupe and Sedan 110Hatchback l'10-1Brake lightsAll Coupes and'96-'98 Sedans 110-15'99-'00 Sedans 110-16Hatchback 110-17Brake system indicator light'96198 models 7'1'99100 models 71-1Ceiling light 114-3Charging system 22Condenser fan 63Console lights 114Cruise control 34Dash lights 114Daytime running lights 110- 13Engine coolant temperature gauge 81-1Fog lights 110-10Front parking lights 110-2Fuel gauge 81-1Fuse/relay boxUnder-dash 6Under-hood 6-4Underhood ABS 6-3Gauges 81Ground distribution 14Ground-to-Componentslndex 6-6Hazard warning lightsAll except '99100 Sedans 110-6'99100 Sedans 110-8Headlights 110-12Headlight switch 100Heater - See Air ConditionerHorn'96197 models 40'98 model 40-1'99100 models 40-2lgnition key reminder 73lgnition systemAll '96198 models except Dl685 20All '99100 models except D16Y5 with Mn 2O-2All D1685 engines 20-2'99-'00 D 16Y5 with M/T 20
lndicators 80Integrated control unit 70lnterlock systemAll except'96J98 CVT 138'96198CVT 138-1License plate lightsAll Coupes and '96-'98 Sedans I l0-3'99100 Sedans 1 10-4Hatchback 110-5Low fuel indicator light 74Moonrool'96197 models |22'98-'00 models 122-1Odometer 81Oil pressure indicator light 80-3Power distributionBattery to ignition switch, fuses, and relaysFuses to relays and components 10-2Power door locksAll models without keyless entry 130'96-'98 models with keyless entry 130-2'99100 models with keyless entry 130-12Power mirrorsWithout detogger 141With defogger '141-2
Power windows 120Programmed fuel injection system (PGNr-Fl)All '96-98 models except D1685 23All '99-'00 models except D16Y5with M/T and D1685 24All D1685 engines 25'99100 D16Y5 with M/T 23Radiator fan 63Rear window defogger'96-,98 models 64'99100 models 64-1Seat belt reminder 73Security system'96.'98 USA HX, LX, EX 133'96-'98 Canada EX, Si 133'99TOO USA HX, LX, EX, DX.V Si 133-4'99100 Canada EX, Si 133-4All CX and DX models 133-8Speedometer 81Starting systemA./T (All except Dl685) 21A"/r (D16Bs) 21-1Manualtransmission 21-2Slereo sound system 150Supplemental rastraint system (SRS) 47Tachometer 81TailliqhtsAllboupes and'96-'98 Sedans 110-3'99100 Sedans 1 10-4Hatchback 110-5Trunk light 114-3Turn signal lightsAll except'99100 Sedans 110-6'99-'00 Sedans 1 10-8Vehicle speed sensor (VSS) 33Wiper/washerFront 91Rear 92
10

- How the Gircuit Works
With the ignition switch in ON (ll) or START (lll),
battery voltage is supplied through fuse 15 and
the BLI(WHT and BLK/YEL wire to the vehicle
speed sensor (VSS). The sensor is grounded by
the BLK wire to G1 01 . The speedometer and
other control units in the circuit supply about 5
volts to the BLU/WHT wire. The vehicle soeed
sensor (VSS) intermittently grounds the
BLUMHT wire which generates a pulsed signal
in it. The number of pulses per minute
increases/decreasos with the soeed of the car.
Reter to th€ Service Manual (Section 23, Electrical)
tor specific tosts or troubleshooting procedures.
33-1