misfiring HONDA CR-V 1998 RD1-RD3 / 1.G Workshop Manual

PGM-FI System
Random Misfire
lF()gool", tftod-' and some or lpiogol throughTo3oti
The scan tool indicates Diagnostic Trouble Code (DTC)
P0300*,, P1300*1 and some of po30t - pO3O4; Randommisfire.
Descriotion
Misfire detection is accomplished by monitoring the crankshaft speed with the crankshaft speed fluctuation (cKF) sensorwhich is attached to the crankshaft.lfmisfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and DTcP0300*', P1300*1 and some of DTCs P03ol through P0304 will be stored. Then, after misfire has ceased, the MtL will comeon,
lf misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and DTcand some of DTCS p0301 through p0304 wi

be stored.NOTE: lf some of the DTCS listed below are stored at the same time as a misfire DTc, troubleshoot those DTcs first. thentroubleshoot the misfire DTC.
P0106, P]128, P1'129; MAp sensorP0171. P0172; Fuet metering
P0505: ldle Control Svstem
P1336, P1337; CKF sensor
P1361, P1362: TDC sensor
Pl381. Pl382: CYP sensor
P1508: IAC valve *1:,97 model*2: '98 - 00 models
Possiblo Caus€
. Fuel pump insufficient fuel pressure, amountofflow. Fuel line clogging. blockage, leakage. Fuel filter clogginga Fuel pressure regulator stuck open. Distributormalfunction
. lgnition coil wire open, leakage. lgnition control module malfunction. Valves carbon deposita Compression lowa Fuel does not meet Owner's Manual spec., lack offuel
Troubleshooting
By test-driving, determine the conditions during which misfire occurs. Depending on these conditions, test in the orderdescribed in the table below.
Possible cause
[ ;;;;- -....
Crankshaft
speed fluctuation
sensor
Fuel
pressureDistributor and
lgnition wirestcMValve
Clearance
Conditionsection 611-178section 23section 23section 6
Only low rpm and load,6)o
Only acceleratingooo
Only high rpm and loado@,a'@
Not specificationG\o@o@
NOTE: lf misfire doesn't recur, some possible causes are fuel that doesn't meet owner's manual spec, lack of fuel, carbondeposits on spark plu9, etc.
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Misfire Detected in One Cylinder
Ipffi1] Thescantoot indicates Diagnostic Trouble Code (DTC) P0301: Cylinder 1 misfire detected.
lF03O2l 16".""n toot indicates Diagnostic Trouble Code (DTC) P0302; Cylinder 2 misfire detected.
I P0303 | fne scan tool indicates Diagnostic Trouble Code (DTC) P0303: Cylinder3 misfire detected.
lF0il04l 16" ""un tool indicates Diagnostic Trouble Code (DTC) PO3O4: Cylinder 4 misfire detected
Description
Misfire detection is accomplished by monitoring the crankshaft speed with the crankshaft speed fluctuation (CKF) sensor
which is attached to the crankshaft.
lf misiiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence. and DTC
P0301, P0302, P0303 and/or P0304 will be stored. Then, after the misfire has ceased, the MIL will come on.
lf misfiring that increases emissions is detected during two consecutive driving cycles. the MIL will come on, and DTc
P0301, P0302, P0303 and/or P0304 will be stored.
NOTE: lJ some of the DTcs listed below are stored at the same time as a misfire DTc, troubleshoot those DTcs first, then
troubleshoot the misfire DTC.
P0107, P0108, P'n2a, P1129t MAP sensor
Po'17 'l , P0112t Fuel suPP|Y system
P0441: EVAP insufficient Purge flow
P1336, P1337: CKF sensor
P1359, Pl361, P1362: TDC sensor
Pl381, P1382: CYP sensor
Possible Cause
. Fuel injector clogging, fuel leakage, air leakage
. Fuel injector circuit open or shorted
. Spark plug carbon deposits, fouling, malfunction
. lgnition wires open, leaking
. Distributor malfunction
. Compression low
. Valve clearance out of specification
(cont'd)
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PGM-FI System
Misfire Detested in One Cylinder (cont'dl
Troubl93hooting Flowchart
The illu stration shows'97 - 98 models,'99 - 00 modelsare similar.
NOTE:.lf there is no freeze data ol misfiring,just clear the DTC..lf there is no freeze data ot misfiring,test drives under various conditionsare necessary,
- Th. MIL h!3 b6on r.portod on.- DTC m30r, P0302, m303. orP0304 is indicated.
Ch.ck tho fuol inicctor tunction:Start the engino, and listen for Iclicking sound at the fuol injectorin the probl€m cylinder.
Check for an open or short in theharness between the ECM/PCMand the luel injector.
Boprir opan or 3hort in tha wlre.
- Roplaco th. tuel inioctor.- Substitut. . known-goodECM/PCM .nd rochock. It3ym ptom/ indicati on go.3aw.y, replace the oliginalECM/PCM.
Problom vorification:1. Atter chacking the lre€ze data,do the ECM/PCM Reset Pro-cedure.2. Exchange the spark plug fromthe problem cylinder with oneol another cylinder.3. Connect the SCS service con-nector.4. Tost-drive the vohicle severaltimes in the rango ol the freezedata.
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(From page 11-128)
lntormittent misfire due lo sparkplug fouling, etc. (no mislire at
this tim€).
ls DTC P0301, P0302, P0303,or P0304 indicated?
ooes the misfire occur in theother cylinder?Replace the faulty spark Plug.
Check lor fuel iniector maltunc-
t|on:1. Exchange the fuel injectorfrom the problem cylinderwith one from another cylin-der.2. Let the engine idle for two min
utes.3. Test'drive the vehicle severaltimes in the range of the freezedata,
lntermittent misfiro due lo bad
contrct in the fuel iniector con-nector {no misfire at this time).
ls DTC P0301, P0302, P0303,or P0304 indicated?
Does the misfire occur in theother cylinder?Replace lhe faulty luel inlector.
Check following items- Valvo clearance- Cvlinder l€ak-down- Compression- Crsnkshaft Speed FluctuationICKF) sensol
NOTE: lf there is no freeze data of misfiring, test drives under various condi_
tions are necessary.
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