ECM HONDA CR-V 1998 RD1-RD3 / 1.G Manual Online

ldle Control System
Power Steering Pressure (PSP) Switch Signal (cont'dl
'98 - 00 models:
*: Do not hold the steering wheel at lulllock for more than five seconds.
ECM/FCM CONNECTORS
PSP SwlTCH 2P CONNECTOR ICl35}
PSP SW IGRNI
JUMpER f-7 T \wtRE L-5 rl
GND (3LX}
Wire side of lemale terminals
Inspection of PSP swilch 3ignal.
Ch€ck tor rn opon in the wire (PSP
SW line):1. Turn the ignition switch ON {ll).2. Measure voltage betlveen ECM/PCM connector terminals 426and 820.
Chock for an open in the wire IPSPSW lin€):1. Turn the ignition switch OFF.2. Disconnect the PSP switch 2Pconnector,3. Turn the ignition switch ON (ll).4. At the wire side. connect thePSP switch 2P connector terminals No. 1 and No.2 with a
5. Measure voltage between ECM/PCM connector terminals 426and 820.
ls there less than 1.0 V?
- Ropai. open in the wire be-tweon th6 ECM/PCM (A26)
and th6 PSP .witch.- R6p.ir open in BLK wire be-tween tho PSP 3witch andG 101,
lsthere less than 1.0 V?Check the op€ration of the PSPswitch:1. Stan the engine2. Turn steering wheel to the fulllock position*.3. Measure voltage b€tween ECM/PCM connector terminals A26and 820.
ls there battery voltage?
PSP switch signal is OK.
Wire side of female terminals
11-164
(To page 11-165)
www.emanualpro.com

{From page 11 164i
Check for a short in the PSPswitch:1. Turn the ignition switch OFF.2, Disconnect the 2P connectorfrom the PSP switch.3. Turn the ignition switch ON (ll).
4. Measure voltage betlveen ECM/PCM connector terminals A26and 820.
Check lor e 3hort in the wire IPSPSW linell1. Turn the ignition switch OFF.2. Disconnect ECM/PCM con-nector A (32P).
3. Check for continuity betweenbody ground and ECM/PCMconnector terminal A26.
ReDair short in the wir€ bstweenthe ECM/PCM (A26) and the PSPswitch.
Substitute a known-good ECM/PCM and rechock. It Drescribodvoltago is now available, roplacethe origin.l ECM/PCM,
ECM/PCM CONNECTORS
A l32Pl
Wire side of female terminals
Wire side of female terminals
1 1-165
www.emanualpro.com

ldle Control System
Brake Switch Signal
This signals the ECM/PCM when the brake pedal is depressed.
('97 model)'- - - - -_- Il
PCM CONNECTORSa t32P) D ll6Pl
BKSW(GRN/WHT)
Wire side of female terminals
Insp€ction of Brak. Switch Signal.
Are the brake lights on withoutpressing the brake pedal?
Inspect the HORN, STOP {15 A)fuse in the undeFhood luse/ relaybox.Do the brake lights come on?
Reoair short in the wire be-tween th€ b.ake switch andth6 HoRN, STOP {15 A)luso,Replaco the HoRN, STOP (15
Al fuse.
Repair op6n in the wir€ be-tween the brake switch andtho HORN, STOP (15 Allus6.Inspect the brrke switch (see
aection l9l.
Check tol .n open in the wire{BXSW linel:1. Press the brake pedal.2. Measure voltage between rcMconnector terminais D5 and Agwith the brake pedal pressed.
Reprir open in the wire betweenthe PcM lD5l rnd the brakeswitch.
(To page 11-167)
1 1-166
www.emanualpro.com

(From page 11-166)
Chock for en open in the wire(BKSW line):1. Press the brake pedal.
2. Measure vohage between ECM/PCM connector terminals A32and 820 with the brake pedalpressed.
Ropair opon in tha wire bstwsonrhe ECM/PCM lA32l rnd thebrako switch.
Brake switch signd b OK.
ECM/FCM OONNECTORS
Wire side of femalo terminals
11-167
www.emanualpro.com

ldle Control System
ldle Speed Setting (cont'd)
38 - 0O mod6l3:
NOTE: Before setting the idle speed, check the follow-
ing items:- The MIL has not been reported on.- lgnition timing- Spark plugs
- Air cleaner- PCV system
1. Start the engine. Hold the engine at 3.000 rpm with
no load (in Park or neutral) until the radiator fan
comes on, then let it idle.
Connect a tachometer.
Disconnect the IAC valve 2P connector and the EVAP
purge control solenoid valve 2P connector.
CONTROLSOLENOID VALVE
SOLENOID VALVE
lf the engine stalls, restart the engine with the accel-
erato. pedal slightly depressed. Stabilize the rpm at
1,000, then slowly release the pedal until the engine
idles.
Che€k the idle in no-load conditions: headlights, blow-
er fan, rear defogger, radiator fan, and air conditioner
are not operating,
ldle speed should bo:
480 t 50 rpm {in PErk or noutrall
11-170
lf necessary, adjust the idle speed, by turning the
idle adjusting screw.
After adjusting the idle speed, recheck the ignition
timing (see section 4). lf it is out of spec, go back to
steo 4.tDt.E
6. Turn the ignition switch OFF.
7. Reconnect the 2P connectors to the IAC valve and
the EVAP purge control solenoid valve, then do the
ECM/PCM reset procedure.
8. Restart and idle the engine with no-load conditions
for one minute, then check the idle speed.
ldle speod should be:,98 model:
750 t 50 rpm tin Park or neutral)'9!l - 00 modsls:
730 i 50 lpm lin Psrk or neutral)
NOTE: lf the idle speed increases to 780 t 50 rpm(770 1 50 rpml*, this means the EVAP system is
purging the canister. To stop the purging temporari-
ly, raise the engine speed above 1,000 rpm with the
accelerator pedal, then slowly release the pedal.*: '99 - 00 models
9. Let the engine idle for one minute with the head-
lights (Low) ON, and check the idle speed.
ldle speed should be:
38 mod6l:
750 f 50 rpm (in Palk or neutrall'99 - 00 modols:
730 t 50 rpm (in Palk or neutral)
10. Turn the headlights off. Let the engine idle for one
minute with the heater fan switch at Hl and air con-
ditioner on, then check the idle speed.
ldls spqed should be:'98 model:
780 t 50 rpm (in Park or neutrall'99 - 00 mod€ls:
7701 50 rpm lin Park or neutral)
lf the idle speed is not within specification. see the
Symptom Chart on page 11-64.
ADJUSTING
www.emanualpro.com

PGM-FI Main Relay
Description
The PGM-Fl main relav actuallv contains two individual
relays. This relay is located at the passenger side of the
cowl. One relay is energized whenever the ignition is on
which supplies the battery voltage to the ECM/PCM,
power to the fuel injectors, and power for the second
relay. The second relay is energized for two seconds
when the ignition is switched on, and when the engine
is running, to supply power to the fuel pump
PGM.FIMAIN RELAY
Belay Testing
NOTE: lf the engine starts and continues to run, the
PGM-FI main relay is OK.
1. Remove the glovebox and the passenger's dash-
board lower cover (see section 20).
2. Remove the PGM-FI main relay
3. Aftach the battery positive terminal to the No. 2 ter-
minal and the battery negative terminal to the No. 1
terminal of the PGM-Fl main relay. Then check for
continuity between the No. 5 terminal and No. 4 ter-
minal of the PGM-FI main relay
. lfthere is continuity, go on to step 3.
. lf there is nocontinuity, replacethe PGM-Fl main
relav and retest.
No.2
To lGN. 1
To GROUND
To ST. SWITCH
To ECM/PCMCONNECTORTERMINAL A16(FLR)
To BAT O
To FUEL PUMPTo ECM/PCMCONNECTORTERMINAL(411 and A24,Bl .nd Bgal(IGP)
To FUEL PUMP
98 - 00 models
Attach the batterv Dositive terminal to the No. 5 ter-
minal and the battery negative terminal to the No. 3
termjnal of the PGM-Fl main relay. Then check that
there is continuity between the No. 7 terminal and
No. 6 terminal of the PGM-FI main relay.
. lf there is continuity, go on to step 4.
. lf there is nocontinuity, replacethe PGM-Fl main
relay and retest.
Attach the batterv oositive terminal to the No.6 ter-
minal and the battery negative terminal to the No. 1
terminal of the PGM-Fl main relay. Then check that
there is continuitv between the No. 5 terminal and
No. 4 terminal of the PGM-Fl main relay.
. lf there is continuity, the PGM-Fl main relay is OK.
. lf there is nocontinuity, replacethe PGM-FI main
5.
(cont'd)
11-147
No.5 No.5
relay and retest.
www.emanualpro.com

Fuel Supply System
PGM-FI Main Relay (cont'dl
('98 - 00 models)-l
(From page 11,188)
Check lor an open in the wire(FLR line):1. Turn the ignition switch OFF.2. Disconnect the ECM/PCM connector A (32P1.3. Check for continuity betweenthe PGM-FI main relay 7P con-nector terminal No. '1 and ECM/PCM connector terminal 416.
Repaia open in the wire betweenthe EcM/PcM lAl5l .nd thePGM-FI m.in relay.
Check for an open in the wiresllcPl,lGP2linos):1. Reconnect the ECM/PCN4 con-nector I (25P).2. Reconnect the PGM Fl mainretay connector.3. Turn the ignition switch ON l).4, Measure voltage betweenECM/PCM connector terminalsB1 and 82, and between 89and 82.
Ropai. open in tho wire b6t-we€n th. ECM/PCM lBt, Btl.nd the FGM-FI main rd.y.R€plac€ th6 FGM+| main retay,
Chock for an open in the ECM/PCM:1. Turn the ignition switch OFF.2, Measure voltage betweenECM/PCM connector terminals416 and 82 when the ignitionswitch is first turned ON (tl) for
Subrtitute e known-good ECM/PCM and recheck. lf prescribsdvoltage b now ovrihble, replacothe originel ECM/PCM.
ls there 1.0 V or less?
Check the PGM-FI main.elav(s6e page 11-1871.
PGM.FI MAIN RELAY 7P CONNECTOF (C€2)
Wire sid€ of female terminals
ECM/PCM CONNECTOR B I25PI
IGP2(YEL/BLKI
ECM/PCM CONNECTORS
a t32Pl
Wire side of female terminals
Wire side of f€male terminsls
1 1-190
Dde"Jt;;liL-F-T--
PGl(BLK}
38s l1011131719202122
www.emanualpro.com

Emission Control System
Three Way Catalytic Converter {TWCI (cont'd}
1P0420 Thescantool indicates Diagnostic Trouble Code (DTC) P0420: Catalyst system efficiency belowthreshold.
DescriDtion
This system evaluates the catalyst's capacity by means of the HO2S (Primary and Secondary) output during stable driving
conditions. lf deterioration has been detected during three consecutive driving cycles, the MIL comes on and DTC P0420 will
be stored.
NOTE: lf some of the DTCS listed below are stored at the same time as DTC P0420, troubleshoot those DTCS first. then
troubleshoot DTC P0420.
P0137, P0138: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) Heater
Possible Cause
. IWC Deterioration
. Exhaust system leakage
Troubleshooting Flowchart
- The MIL has been reDoried on.- DTC P0420 is stored.
Problem verification:1. Do the ECM/PCM Reset Procedure,2. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutrali untilthe radiator fan comes on.3. Connect the SCS service connector.4. Test-drive 40 - 55 mph (64 - 88km/h) for approx. lwo minutes.Then decelerate for at least 3seconds with the throftle completely closed. Then reducethe vehicle speed to 35 mph
156 km/h), and try to hold ituntil the readiness code
Intermittent tailure. system is OKat this time.ls DTC P0420 indicated?
Check the TWC (see section 9).lI nocessary, replace the TwC.
11-200
www.emanualpro.com

Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
99 - 00 models:
The scan tool indicates Diagnostic Trouble Code {DTC) P0451: The Fuel Tank Pressure sensor circuit range/oerformance Droblem.
ECM/PCM CONNECTORS
SG2 {GRN/BLK)
Wire side of {emaleterminals
FUEL TANKPRESSURESENSOR
VACUUMPUMP/GAUGE.0 -30 in.H9A973X - 041 -
XXXXX
- The MIL har been rooort€d on.- DTC P0451 b storod.
Check lor th6 tu6l tank pr€ssurelen30r:1. Do the ECM/PCM Reset Proce,oure.2. Remove the fuelfill cap.3. Turn the ignition switch ON (ll).4. Monitor the FTP Sensor voltage with the Honda PGMTester, or measure voltagebetween ECM/PCM connectorterminals A29 and C18.
Chock tho vacuum lin6s torrGlriction o. blockago repair asnecessary. lf OK, roplace the fueltank Drer3ur€ sentor.
ls there approx. 2.5 V?
Check for the fuel tank piessureSensot:L Disconnect the hose betweenthe EVAP two way valve andthe fuel tank pressure sensor atthe EVAP two way valve end.2. Connect a vacuum pump tothe open end ofthat hose.3. Turn the ignition switch ON (lll.4. Monitor the FTP S€nsor volt-age with the Honda PGMTester, or measure voltagebetween ECNI/PCNI connectorterminals A29 and C18, andcarefully appiy vacuum on thehose one stroke at a time.5. The voltage should smoothlydrop from the staning approx.2.5 V down to approx. 1.5 V.STOP applying vacuum whenthe voltage drops to approx.1.5 V or damage to the tueltank pressure sensor may
Does the voltage drop to approx.1.5 V and hold?
Intermittent tailuro. sv3tem is OKat this tim€. Chack to. poor con-n€ction6 or 10036 hose at fu6ltank pres3ure ionsor and fueltrnk.
a t32Pl
PTANK ILT GRNI
WAY VALVE
11-208
www.emanualpro.com

'98 - 00 mod€ls:
The scan tool indicates Diagnostic Trouble Code (DTC) P0452: A low voltage problem in the Fuel Tank Pressure
sensof.
The fuel tank Dressure sensor converts fuel tank absolute pressure into electrical signals and inputs the ECM/PCM.
OUTPUTVOLTAGEtvl{.5
0,5-? KPA(-50 mmHg,-2 in.Hgl
+7 kPr
l5O mmHg,2 in.Hgl
PRESSURE
ECM/PCM CONNECTOR A (32P)
Wire side ot female terminals
FUEL TANKPRESSURE SENSOR3P CONNECTOR tc6a6l
voc2(YEL/BLUI
Wire side ol fsmale terminals
(cont'd)
11-209
Th. MIL has been reoorted on.DTC m452 is stored.
Check the vacuum lin6:Check the vacuum lines of the fueltank pressure sensor for misrouting, leakage, breakage and clog-ging.
Are the vacuum lines OK?
Problem veriticstion:1. Do the ECM/PCM ResetProcedure-2. Remove the luelfillcap.3. Turn the ignition switch ONfl r).4. Monitor the FTP Sensor volt'age with the Honda PGMTester, or measure voltagebetween body ground andECM/PCM terminalA29.Intermittent failuro, system is OKat this lima. Chack lor Door con-nections or loose wi.es at C580llocrted rt access panell, C646lluel tank Daessure sensor) andat the ECM/PCM.
ls lhere approx. 2.5 V?
Check lor an open in wir€ lVeC2line):1. Turn the ignition switch OFF.2. Reinstallthe fuel fill cap.3. Disconnect the fuel tank pres-
sure sensor 3P connector,4. Turn the ignition switch ON (ll).
5- Measure voltage between thefLrel tank pressure sensor 3Pconnector No. 1 terminal andNo.2 terminal.
Replir opon in the wire b€tw€enth6 tuel tank pressure lensot andthe ECM/PCM {A29).ls there approx. 5 V?
YES
(To page 11-210)
www.emanualpro.com