1997 HONDA CIVIC For

c130
I10
l112131,4t5ta11t8t9
ct3r
1lz3lt/X61789to
cr34 tEcM/PCM-C)cr35 lPCM-Dr:cr35lPcl|.D,€
ca32
lr 2 3.1
IiGTNiBN Ill
l5l-wxr,nol]ll:a BLX vHI I
NOTE; . Different wires with the same color have been given a number suffix to distinguish them (for example, YEUBLK1
and YEUBLK, are not the samel.
O: Related to Fuel and Emissions Svstem.- Connector with male terminals (double outline): View from terminal side
- Connector with female terminals (single outline): View from wire side
lrl2l
lll* -_-l
tn Bs I
c1a
lr 2l
f.fil
,bl onrrwlrl.lftlBLrwHri-Flirx,lvHJ l]-l
c,|52 tEcM/PCM-Al
\-a
't/3l-1.51
/tgto 'lt12l3
2at6IE e t|0111'12ItItIt[l
11-79

System Descriptions
System Connectors lFuel Pump]
('9!, - 00 models 6xcept Dl6Y5 ongino with M/T)
\(
I
c568
ffi
c565
E
c792
Different wires with the same color have been given a number suffix to distinguish them (for example, YEUBLKIand YEVBLK, are not the same).
O: Related to Fuel and Emissions System.- Connector with male terminals (double outline): View from terminal side- Connector with female terminals (single outline): View from wire side
c793
fr
NOTE: o
a
a
1 1-80

Troubleshooting
Troubleshooting Procedures
How To Begin Troubleshooting
When the Malfunction Indicator Lamp (MlL) has been reported on, or there is a driveability problem, use the appropr'-
ate orocedure below to diagnose and repair the problem'
A. When the MIL has come on:
,1. connect the Honda PGM Tester or an oBD ll scan tool to the 16P Data Link connector (DLC) located near the left
kick panel.
2. Turn the ignition switch ON (ll)
3. Check the DTC and note it. Also check and note
the freeze trame data
Refer to the Diagnostic Trouble Code Chart and
begin troubleshooting.
NOTE:
.SeetheoBD||scantoolorHondaPGMTesteruser,smanua|sforspecificoperatinginstructions..
.Thescantoo|oltestercanreadtheDiagnosticTroub|ecodes(DTc},freezeframedata,currentdata,andother
Engine Control Module (ECM)/Powertrain Control Module (PCM) data'
oFreezeframedataindicatestheengineconditionswhenthefirstma|function,misfireorfue|trimma|function
was detected. lt can be useful information when troubleshooting'
B. When the MIL has not come on , out there is a d riveability problem, refer to the Symptom Chart on page 1 1-84'
c.DTcswi|lbeindicatedbytheb|inkingoftheMa|function|ndicatorLamp(M|L)withthescsserviceconnectorcon.
nected.
Connect the SCS service connector to Service Check Connector as shown (The 2P Service Check Connector is
|ocatedunderthedashonthepassenger,ssideofthevehic|e')TurntheignitionswitchoN{||)'
OBO ll SCAN TOOL olHONOA PGM TESTER
SERVICE CHECKCONNECTOR I2P)
scs sERvlcE(cont'd)
MALFUNCTIONINDICATORLAMP
DATA LINK CONNECTOR Il6PI
07PAZ - (x)l0100
11-81

Troubleshooting
Troubleshooting Procedures (cont,dl
ll, Engine Control Module (ECM)/powertrain Control Module (pCM) Reset procedure
NoTE: Resetting the EcM/PcM will erase any stored DTcs and any freeze data. lt will also restart all readiness codemonitors.
Either of the following actions will reset the ECM/PCM.
. Use the OBD ll scan tool or Honda pGM Tester to clear the EClM,s/pCM,s memory.
NorE: see the oBD ll scan tool or Honda PGM Tester user's manuals for specific operating instructions.
' Turn the ignition switch oFF. Remove the BACK uP (7.5 A) fuse from the under-hood fuse/relay box for 10 sec-onds.
NorE: Bemoving the BACK uP (7 5 A) fuse cancels the clock and the radio presets. Make note of the customer,spresets so you can reset then
lll. Final Procedure (this procedure must be done after any troubleshoottng)
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 EcMipcM, the MtL will stayon when the ignition switch is turned ON 0l).
2. Do the ECM/PCM Reset procedure.
3. Turn the ignition switch OFF.
1-82

lf the inspection for a particular code requires voltage or resistance checks at the ECM/PCM connectors, remove the right
kick panel. Pull the carpet back to expose the ECM/PCM. Remove the ABS control unit if so equipped. unbolt the EcM/
PCM bolt. Turn the ignition switch oFF, and connect the backprobe sets and a digital multimeter as described below
check the system according to the procedure described for the appropriate code(s) listed on the following pages'
The illustrationshows '96 - '98 models.
How to Use lhe Backprobe Sets
connect the backprobe adapters to the stacking patch cords, and connect the cords to a multimeter. using the wire insula-
tion as a guide for the contoured trp of the backprobe adapter. gently slide the tip into the connector from the wire side
until it comes in contact with terminal end of the wire'
BackProbe
BACKPROEE SET
07SAZ - 001000A lTwo
DIGITAL MULTIMETER(Commercially avail.bleI orKs - AHM - 32 - oo3 (cont'd)
KICK PANEL
1 1-83

Troubleshooting
Troubleshooting Procedures (cont,dl
CAUTION:
. Punqturing ihe insulation on a wirs can cause poor or intermiftent electricar connections.I Bring the test€r probe into contacl with the terminatlrom the terminal side of wire harnesg conncctors in the gngin€compartment. For temale connectors, iust touch lightly with the tester probe and do not inse.t the probe.
\I
RUBBER SEAL
Other Probable Causes for an engine that will not start:- Compression- Starting system- lntake air leakage - Overheating- Engine locked up - Battery- Timing belt
TESTER PROBE
Symptom Chart
Listed below are symptoms and probable causes for problems that Do NoT cause the Malfunction indicator Lamp (MlL) tocome on. lfthe MIL was reported on, go to page 11_81.Troubleshoot each probabre cause in the order risted (from reft to right) untir the symptom is eriminated.The probable cause and troubleshooting page reference can be found berow.
L
*: '99 - 00 models
TERMINAL
SYMPTOMPROBABLE CAUSE
4,2,3, 5,20, 14, 1
2, 4, 11, 16, 13, 't9
?, s^6. 16
1,8,10.9
Engine will not sta rt
Hard starting
Cold fast idle too low
Cold fast idle too high
ldle speed fluctuates7,8, 10.9
Troubleshoot for misfire on pages l1-166, 167Misfire or rough running
LOW power
E"g|* "t"lb
2,9, 10, 12, 11, 16, 't8,20
2,4,11,7,20,8,5,15
't9, 21
1r, ,1
Difficult to refuel*
Fuel overflows during refueling*
11-84

Probable Cause List lFor th€ DTC Chart, see page 11-971*: '99 - 00 models
Probable GausePageSystem
11 1-107Engine Control Module (ECM)/Powertrain Control Module (l'uM)
PGM-Fl main relay
l^^iti^n cwetam
211-230,231
3't't-237
Section 23
51'1-172,183Crankshaft Position/fop Dead Center/Cylinder Fosltlon sensor clrculr' Lr\F selrsor
circuit
Intake Air Temperature (lAT) sensor circuit
ldle Air Control (lAC) Valve
ldle speed adjustment
Throttle bodY
Throftle cable
Manifold Absolute Pressure (MAP) sensor
Throftle Position (TP) sensor
Barometric pressure (BARO) senso'
Mf g"a, po"ition signal (see page 11-216) or clutch switch signal
Brake switch signal
Air Cleaner
lntake air pipe
Three Way Catalytic Converter (TWC)
Evaporative emission (EVAP) control
Contaminated fuel
ORVR vent shut valvs
't1-124
71 1-194
I11-220 - 223
11-241
'1011-244
1111-115
1211-132
13't1-178
14Section 14. 11-218
1511-210
16't1-244
1811-252
1911-261
20
21*11-296
(cont'd)
11-85

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