1999 HONDA CIVIC troubleshooting

Troubleshooting
Diagnostic Trouble Code (DTGI Chart (cont'dl
*7: D16YS engine (M/T)*8: D16Y5, D'16Y8 engine*9: USA model*14r'97 model*15r '96 model
DTC(MlL indicationlDetection lt6mProbablc CausePage
P1162+1 (48)Primary Heated Oxygen Sensor(Sensor 1) CircuitMalfunction
Open or short in Primarv HO2S (Sensor 1Primary H02S (Sensor 1)1 1- 146
P]163' (61)Primary Heated Oxygen Sensor(Sensor '1) CircuitSlow Response
. Primary HO2S (Sensor 1)
11-145
Pl164*r (61)Primary Heated Oxygen Sensor(Sensor l) Cjrcuit Range/Performance Problem
. Primary HO2S (Sensor 1)
1 1- 150
P1165*? (61)Primary Heated Oxygen Sensor(Sensor 1) Circuit Range/Performance Problem
. Primary HO2S (Sensor 1)
11-150
P1166' (41i
Primary Heated Oxygen Sensor(Sensor '1) Heater System ElectricalProblem
Open or short in Primary HO2S (Sensor 1)heater circuitPrimary HO2S (Sensor 1)ECM/PCM
1 1-'161
P1167*' (41)Primary Heated Oxygen SensorlSensor 1) Heater SystemMalfunction
Open in Primary HO2S (Sensor 1) VS+ circuitPrimary HO2S (Sensor 1) HeaterPrimarv HO2S {Sensor 1)1 1- 163
P1168*' (48)Primary Heated Oxygen Sensor(Sensor 1) LABEL Low Input
. Short in Primary HO2S (Sensor 1) LABELcircuit11-151
Pl169*? (48)
Primary Heated Oxygen Sensor(Sensor 1)IABEL High Input. Open in Primary HO2S (Sensor 1)IABELcircuit. Short in ground circuit11.152
P1259*3(221
WEC System MalfunctionWEC Solenoid ValveOpen or short in WEC SolenoidValve circu itVTEC Pressure SwitchOpen or short in VTEC Pressure SwitchcircuitECM,FCM
Section 6
P1297*s (20)Electrical LoadDetector CircuitLow Input
Electrical Load DetectorElectrical Load Detector circuitECM/PCM11-179
Pr298+' l20l
Electrical LoadDetector CircuitHigh Input
Electrical Load DetectorElectrical Load Detector circuitECM/PCM1 1-181
anosome ofP0301P0302P0303P0304
l71ll72ll73ll7 4l
Bandom Misfirelgnition systemFuel supply systemMAP sensorEGR systemIAC valveContaminated fuelLack ol fuel
11-166
1 1-100

Troubleshooting
Diagnostic Trouble Code (DTCI Ghart (cont'd)
DTClMlL indicationlDetegtion homProbablo CsussPage
P1491*! \12J
EGR ValveLift InsufficientDetected
EGR valve (with lift sensor)EGR valve lift sensor circuitEGR control solenoid valve (A,/I)
EGR control solenoid valve circuitEGR lineEGR valve circuit (M/T)
ECM
't1-256
P1498*. 112)
EGR ValveLift SensorHigh Voltage
EGR valve (with lift sensor)EGR valve lift sensor circuitECM11-265
Pl508*10 (14)
ldle Air Control ValveCircuit FailureIAC valveIAC valve circuitECM
'11-194
{14)
ldle Air Control ValveCircuit FailureOpen or short in IAC valve circuitIAC valveECM/PCM1l-198
P1607 1-)
Engine ControlModule/Powertrain Control lvlodulelnternalCircuit Failure A
. ECM/PCM
11-188
P1655*1 (30)TMA,/TMB Signal Line FailureODen or sho.t in TMA,/TMB circuit11-189
P1705P1706P 1753P1758P1768P1785P1790P1791P1793 (70)*
P1870P1873P1879P1885P1886P1888P1890P1891
Automatic Transaxle
Section 14
*: The E indicator light and the Malfunction Indicator Lamp {MlL) may come on simultaneously.*4: D16Y5 engine (M/T)+10: Except A/T and Dl6Y7 engine*11: A,/T and D16Y7 engine*18: D16Y5 engine (CW) (except '99 - 00 models)
11-102

How to Read Flowcharts
A flowchart is designed to be used from start to final repair. lt's like a map showing you the shortest distance. But beware:
lf you go off the "map" anywhere but a "stop" symbol, you can easily get lost.
tSrARTl(bold type)
FanoNl
@
tsroP I
{bold type)
Describes the conditions or situation to start a troubleshooting flowchart.
Asks you to do something; perform a test, set up a condition etc.
Asks you about the result of an action, then sends you in the appropriate troubleshooting direction.
The end of a series of actions and decisions. describes a final repair action and sometimes directs you to
an earlier part of the flowchart to confirm your repair,
NOTE:
. The term "lntermittent Failure" is used in these charts, lt simply means a system may have had a failure. but it checks
out OK at this time. lf the Malfunction Indicator Lamp (MlL) on the dash does not come on, check for poor connections
or loose wires at all connectors related to the circuit that you are troubleshooting (see illustration below)'
. Most of the troubleshooting flowcharts have you reset the Engine Control Moduls (ECM)/Powertrain Control Module
(pCM) and try to duplicate the Diagnostic Trouble Code (DTC). lf the problem is intermittent and you can't duplicate the
code, do not continue though the flowchart. To do so will only result in confusion and, possibly, a needlessly replaced
ECM/PCM.
. ,,Open" and "Short" are common electrical terms. An open is a break in a wire or at a connection. A short is an acci-
dental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't
work at all. In complex electronics (like ECM's/PCM'sl. this can sometim€s mean something works, but not the way it's
suDDosed to.
toosE
1 1-103

3.
5.
6.
1.
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 the following rpm:. D16Y5 engine (M/T):850 rpm. D]6Y5 engine (CVT), D'16Y8 engine (USA M/T): 920 rpm
. Dl6Y8 engine (USA A,/I), D16Y7 engine (USA A,/T);910 rpm
. D16Y8 engine (Canada M/T), D16Y7 engine (canada): 990 rpm
' D16Y8 engine (Canada M/T): 1,000 rpm
. 816A2 engine: 970 rpm
. Fuel cut-off action also takes place when engine speed exceeds 6,900 rpm (D16Y5, D16Y7 engine; D'16Y8 engine:
7,000 rpm. 816A2 engine: 8.100 rpm), regardless of the position of the throttle valve, to protect the engine from
over-rewing. With '99 Dl6Y7 engine (A,/T) and '99 D16Y8 engine (A./T), the PCM cuts the fuel at engine speeds over
5,000 rpm when the vehicle is not moving.
IVC Compressor Clutch Relay
When the ECM/PCM receives a demand for cooling from the air conditioning system, it delays the compressor from
being energized, and enriches the mixture to assure smooth transition to the A,/C mode
Evaporative Emission (EVAP) Purge Control Solenoid Valve*'
When the engine coolant temperature is above 154'F (68'C). the ECM/PCM controls the EVAP purge control solenoid
valve which controls vacuum to the EVAP purge control canister.
Evaporative Emission (EVAP) Purge Control Solenoid Valve*a
When the engine coolant temperature above 154"F (68"C), intake air temperature above 32"F (0'C) and vehicle speed
above 0 mile (0 km/h) or [Ay'C compressor clutch on and intake air temperature above 160"F (41'C)], the ECM/PCM
controls the EVAP purge control solenoid valve which controls vacuum to the EVAP purge control canister.
Exhaust Gas Recirculation (EGR) Control Solenoid Valve*?
When EGR is required for control of oxides of nitrogen (NOx) emissions. the ECM controls the EGR control solenoid
valve which supplies regulated vacuum to the EGR valve
Alternator Control
The system controls the voltage generated at the alternator in accordance with the electrical load and driving mode,
which reduces the engine load to improve the fuel economy.
ECM/PCM Fail-safe/Back-up Functions
1. Fail safe Function
When an abnormality occurs in a signal from a sensor, the ECM/PCM ignores that signal and assumes a pre-pro-
grammed value for that sensor that allows the engine to continue to run.
2. Back-uD Function
When an abnormality occurs in the ECM/PCM itself, the fuel injectors are controlled by a back-up circuit independent
of the system in order to permit minimal driving.
3. Self diagnosis Function lMalfunction Indicator Lamp (MlL)l
When an abnormality occurs in a signal from a sensor, the ECM/PCM supplies ground for the lvllL and stores the DTC
in erasable memory. When the ignition is initially turned on, the ECM/PCM supplies ground for the MIL for two sec-
onds to check the MIL bulb condition.
4. Two Trip Detection Method
To prevent false indications, the Two Trip Detection Method is used for the HO2S, fuel metering-related. idle control
system, ECT sensor, EGR system and EVAP control system self-diagnostic functions. When an abnormality occurs,
the ECM/PCM stores it in its memory. When the same abnormality recurs after the ignition switch is turned OFF and
ON 0l) again, the ECM/PCM informs the driver by lighting the MlL. However, to ease troubleshooting, this function is
cancelled when you jump the service check connector. The MIL will then blink immediately when an abnormality
occurs,
5. Two (or Three) Driving Cycle Detection Method
A "Driving Cycle" consists ot starting the engine. beginning closed loop operation, and stopping the engine. lf misfir-
ing that increases emissions is detected during two consecutive driving cycles, or TWC deterioration is detected dur-
ing three consecutive driving cycles, the ECM/PCM turns the MIL on. However, to ease troubleshooting, this function
is cancelled when you jump the service check connector. The MIL will then blink immediately when an abnormality
occurs.
(cont'd)
1 1-1 05
.1.

PGM-FI System
Engine Control Module/Powertrain Control Module (ECM/PCMI
('96 - 98 Models,'99 - 00 Dl6Y5 engine with M/Tl (cont'd)
NOTE:. When there is oo Diagnostic Trouble Code (DTC) stored, the MtL wi

stay on if the SCSservace connector is connected and the ignition switch is on,. lf this symptom is intermittent, checklor:- A loose Fl E/M 115 A) fuse in the under hood luse/relay box- A loose No. 13 FUEL PUMP fuse (15 A) in the underdash fuse/relay box- An intermittent shon in the wire between the ECM/PCM (C7) and the service cnecKconnector- An intermittent short in the wire between the ECM/PCM (A18) and the gaugeassembly- An intermittent shon in the wire between the ECM/PCM {D4) and the MAp sensorAn intermittent short in the wire between the ECM/PCM (D10), the Tp sensor, theEGR valve l:ft sensor (D16Y5 engine) and/or the Fuel tank pressure sensor (,96Dl6Y8 engine (coupe), '97 016Y7 engine (coupe: KL model, sedan: KL (LX) modeli,'97 016Y8 engine {coupe: all models, sedan: KL modeti,'98,all models}- PGM-FImain relay. See the OBD ll scan tool or Honda PGM Tester user's manuals lor specitic operatinginstructions.
ECM/PCM CONNECTOR C 13lPI
Wire side of female terminals
(To page 11 109)
(To page 11,109)
11-108
The Maltunction Indicator Lamp(MlLl stays on o. comes on eftartwo s€conds,
Check the Oiagnoslic TroubleCode {DTC}I1. Connect a scan tool or HondaPGM Tester.2. Turn the ignition switch ON (ll).
3. Read the DTC with the scantool or Honda PGM Tester.
Go to troubleshooting p.oc€dur€s(se€ pago 11{11.Are any DTC{s) indicated?
Check the DTC by MIL indication:1. Turn the ignition switch OFF.2. Connect the SCS service con,nector to the service checkconnector.3. Turn the ignition switch ON (lli.
Repair opon ol short in wirebotwoen the ECM/PCM (C8)
and Data Link Connector.Go to troublelhooting proce-dure ls6e page 11-811.
Does the MIL indicate any DTC?
Try to start the engine.
Does the engine start?
Check for a short in the wire(SCS lin€l:1. Disconnect the SCS serviceconnector.2. Stop the engine and turn theignition switch ON {lli.3. Measure voltage between theECM/PCM connector terminalC7 and body ground.
Ropair short to body Iround inthe wire betweon ECM/PCM lCTland sorvice check connector.
ls there approx. 5 V?
scs tBRNI

NOTE:"in-"n tf'"r" is no Diagnostic Trouble Code (DTCi stored, the MIL will stav on ;{ the scs
service connector is connected and the ignition switch is ON (ll)
. lf this symptom is intermittent, check for:- An intermittent short in the wire between the ECM/PCM (A10) and the service check
connector- An intermittent short in the wire between the ECM/PCM (A181 and the gauge
. s"" it'" Oab ll scan tool or Honda PGM Tester user's manuals for specific operating
instructions.
'l
ECM/PCM CONNECTOR A I32P)
Wire side of female terminals
The Malfunction Indicator LamP
lMlL) staYs on or comes on after
Check the Diagnostic Trouble
Code (DTC):
1. Connect a scan tool or Honcla
PGM Tester.
2. Turn the ignition switch ON (ll)
3. Read the DTC with the scan
tool or Honda PGM Tester.
Go to troubloshooting Proc€dures(see page 1141).Are any DTC(S) indicated?
check the DTC by MIL indic.tion:
1. Turn the ignition switch OFF
2. Connect the SCS service con_
nector to the service check
3. Turn the ignition switch ON (ll)
Repair open or 3hort in wiro
between ihe ECM/PCM (A21)
and Data Link Connector.
Go to troubleshooting Ploce_du.es (see page 11-811.
Does the MIL indicate anY DTC?
Try to start the engine
Substitute . known-good ECM/
PCM and recheck lt sYmptom/
indication goes awaY, rePlaca
th. original ECM,/PCM.
Check for a short in the wi.e(Scs line):1. Turn the ignition switch OFF
and turn the ignition switch
oN 1 ).2- Meas u re voltage between
body ground and the ECM/
PCM connector terminal A10
Reoair short to body ground in
the wiro bstwaen ECM/PCM (A101
and service ch€ck connoctot.ls there battery voltage?
(To page 11-'114)
(cont'd)
1 1-1 13

PGM-FI System
Engine Coolant Temperature (ECTI Sensor
The scan tool indicates Diagnostic Trouble code (DTC) P0116; A range/performance problem in the EngrneCoolant Temperature (ECT) Sensor circuit.
The ECT Sensor is a temperature dependant resistor (thermistor). The resistance of the thermistor decreases as the enginecoolant temperature increases as shown oetow.
RESISTANCE(ko)
NOTE: lf DTC P0117 and/or P01'18 are stored at the same time as DTCfor DTC P0116.
Possible Cause
. ECT sensor deterioration. Malfunction in the thermostat and cooling system
Troubleshooting Flowchart
-a 32 68 r0a la0l?6 2t2 2481'rr-20 o 20 ao o D r@ Il, r'c)
ENGINE COOLANT IEMPERATURE
P0116, troubleshoot those DTCS first. then recheck
11-128
THERMISTOR
- The MIL has bogn reported on.- DTC P0116 is stored.
Problem verification:1. Start the engine. Hotd theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on,then let it idle.2. With the scan tool, check the
Intermiftent lailure. system is OKai thi. time. Ch.ck the thc.mo-stat 6nd thc cooling system.
is 176 200'F {80 - 93'C)or0.0-0.TVindicated?
Check the thermostat and thecooling system. ll they als OK,raplace the ECT sensor.

t
Troubleshooting Flowchart
'l
NO
a-,-:- -
YES
- The MIL ha3 b€on rePorled on.- DTC P0171 a^dlot P0172 arc
stored,
is the fuel pressure OK?
Check the fuel pt€ssure regulator
and fusl re{urn pipe.ls the fuel pressure too high
ortoo low?
Check the Primary HO2S:
1. Start the engine. Hold the
engine at 3,000 rpm with no
Ioad (in Park or neutral) until
the radiator Ian comes on
2. Check the Primary HO2S(Sensor 1) output with the
scan tool,
Check the tu6l pump. fuel leedpipe, fu€l fiher, and Iuel Pressureregulator.
Does it stay at less than 0.3 V
or more than 0.6 V?
Check lor a sticking or leaking
EVAP purge control solenoid
With a vacuum PumP, aPPIY vacu-
um to the EVAP purge control
solenoid valve from the intake
manifold side.
Does it hold vacuum?
Check the MAP sensor outputr
1. Turn the ignition switch ON (ll)
2. Check the MAP with the scan
tool.
Check th6 response of the MAP
sensoa:1. Start the engine.2. Check the MAP with the scan
tool.
ls a MAP of 40.0 kPa 1300 mmHg,12.0 inHg) or less indicated within
one second after starting the
engine?
- Check th€ valve cloarance.- Check the EGR rystem lD16Y5enginel.- lf they are OK, r€place the tueliniocto]3.
1 1-165