1999 HONDA CR-V Air mix control

homelink height adjustment fuse box location hood open transmission MPG

Page 282 of 1395

HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual
PGM-FI System
System Description
INPUTS
CKP/TDC/CYP Sensor
CKF Sensor
MAP Sensor
ECT Sensor
IAT Sensor
TP Sensor
Primary HO2S
Secondary H02S
vss
KS*5
BARO Sensor
ELD*6
Starter Signal
ALT FR Signal
Ai

PGM-FI System
System Description
INPUTS
CKP/TDC/CYP Sensor
CKF Sensor
MAP Sensor
ECT Sensor
IAT Sensor
TP Sensor
Primary HO2S
Secondary H02S
vss
KS*5
BARO Sensor
ELD*6
Starter Signal
ALT FR Signal
Air Conditioning Signal
Ay'T Gear Position Signal*1
Baftery Voltage (lGN.1)
Brake Switch Signal
PSP Switch Signal
Fuel Tank Pressuae Sensor*4. *5
Countershaft Speed Sensor*1
Mainshaft Speed Sensor*r
OVER-DRIVE Switch Signal*s
ENGINE CONTROL MODULE (ECM)/
POWERTRAIN CONTROL MODULE (PCM) OUTPUTS
|iuel 1"j""- Th,rhg ""d Drrafr";-l
Et*-.nt"tdt"cont.orl
to,r*,c;;trffi;]
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Ecir/PcM B*k',p Fr""il]
m;"t-ll-r*'io*l
Fuel Injectors
PGM-Fl Main Relay (Fuel Pump)
MIL
IAC Valve
Ay'C Compressor Clutch Relay
Radiator Fan Relay
Condenser Fan Relay
ALT
tcM
EVAP Purge Control Solenoid
Valve
Primary HO2S Heater
Secondary H02S HeaterEVAP Bypass Solenoid Valve*a *5
EVAP Control Canister Vent Shut
DLC
Lock-up Control Solenoid Valve*l
Shift Control Solenoid Valve*1
Ay'T Clutch Pressure Control
Solenoid Valve*1
D4 Indicator Light'1 *3, *a
D Indicator Light,l *5
OVER-DRIVE OFF Indicator
Lighl*t *:
*1: A/T {3:'97 model'2: M/f +4:'98 model*5: '99 - 00 models"6: USA
PGM-Fl System
The PGM-Fl system on this model is a sequential multiport fuel injection system.
Fuel iniecior Timing and Duration
The ECM/PCM contains memories for the basic discharge durations at various engine speeds and manifold pressure. The
basic discharge duration, after being read out from the memory, is further modified by signals sent from various sensors
to obtain the final discharge duration.
ldle Air Control
ldle Air Control Valve (lAC Valve)
When the engine is cold, the Ay'C compressor is on, the transmission is in gear, the brake pedal is depressed, the P/S load
is high, or the alternator is charging, the ECM/PCM controls current to the IAC Valve to maintain the correct idle speed.
lgnition Timing Control
o The ECM/PCM contains memories for basic ionition timing at various engine speeds and manifold air flow rates.
lgnition timing is also adjusted for engine coolant temperature.
. A knock control system was adopted which sets the ideal ig nition timing for the octane rating of the gasoline used.*s
Other Control Funstions
1. Starting Control
When the engine is started. the ECM/PCM provides a rich mixture by increasing fuel injector duration.
2. Fuel Pump Control
. When the ignition switch is initially turned on (ll). the ECMiPCM suppli€s ground to the PGM-FI main relay that
supplies current to the fuel pump for two seconds to pressurize the fuel system.
. When the engine is running, the ECM/PCM supplies ground to the PGM-FI main relay that supplies current to the
fuel oumo.
. When the engine is not running and the ignition is on, the ECM/PCM cuts ground to the PGM-FI main relay which
cuts current to the fuel pump.
1 1-80
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Page 283 of 1395

HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual
Fuel Cut-off Control
. During deceleration with the throttle valve closed, current to the fuel injectors iscutoffto improvefuel economyat
speeds over 970 rpm (97 - 98 models), 920 rpm (99 - 00 mode

Fuel Cut-off Control
. During deceleration with the throttle valve closed, current to the fuel injectors iscutoffto improvefuel economyat
speeds over 970 rpm ('97 - 98 models), 920 rpm ('99 - 00 modelsl.
. Fuel cut-off action also takes place when engine speed exceeds 6,500 rpm ('97 - 98 models), 6900 rpm ('99 - 00
models), regardless of the position of the throttle valve, to protect the engine from over-rewing.
With Ay'T model. the PCM cuts the fuel at engine speeds over 5,000 rpm when the vehicle is not moving.*'
4,./C Comoressor Clutch Relav
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 a smooth transition to the Ay'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,
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.
PCM Fail-saf e/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-pre
grammed value for that sensor that allows the engine to continue to run.
2. Back-up 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 IMalfunction Indicator Lamp (MlL)l
When an abnormality occurs in a signal from a sensor, the ECM/PCM supplies ground for the MIL and stores the DTC
in erasable memory. When the ignition is initially turned on {ll), the ECM/PCM supplies ground for the MIL for two
seconds to check the MIL bulb condition.
4. Two Trio Detection Method
To prevent false indications, the Two Trip Detection Method is used for the HO2S*1, fuel metering-related. idle control
system, ECT sensor 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 (ll) 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 {'97 model)
A "Driving Cycle" consists of starting the engine, beginning closed loop operation, and stopping the engine. lf misfir-
ing that increases emissions or EVAP control system malfunction is detected during two consecutive driving cycles.
or TWC deterioration is detected during 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.
*1: '97 - 98 models*2: '99 - 00 models
5.
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Page 1096 of 1395

HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual
Component Location
Index (contdl
SRS components are located in this area. Review the SRS component locations, precautions, and procedures in the SRS
section (24) before performing repairs or service

Page 1099 of 1395

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Page 1101 of 1395

HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual
Self-diagnosis Function
The heater control panel has a self-diagnosis function.
Running the Self-diagnosis Function97 mod€l:
Turn the ignition switch ON {ll), then set the mode control dial to the

Self-diagnosis Function
The heater control panel has a self-diagnosis function.
Running the Self-diagnosis Function'97 mod€l:
Turn the ignition switch ON {ll), then set the mode control dial to the Vent position, and the recirculation controt switch toRecirculate {recirculation indicator light comes on). Press and hold the recirculation control switch to Fresh (recirculation indi-cator light goes off). Continue to hold the switch; the recirculation indicator light will come on for two seconds. then it willblink the Diagnostic Trouble Code (DTC) to indicate a iaulty component. lf no DTC'S are found, the indicator liqht will notblink atter the initial two second light.
'98 - 00 models:
Set the mode control dial to the Vent position, and turn the ignition switch ON (ll). Within six seconds after turning the igni-tion switch on, press the recirculation control switch the required number of times depending on the recirculation indicatorlight status:
.lftheindicatorlightisON,presstherecirculationcontrol switch five times..lftheindicatorlightisOFF,presstherecirculationcontrol switch six I|mes.The recirculation indicator light will come on for two seconds, then blink the Diagnostic Trouble Code (DTC) to indicate afaulty component. lf no DTC'S are found, the indicator light will not blink after the initial two second liqht.
DTC Indicaiion Pattern {See DTC 3}:
Rocirculationindicatorlight on
Recirculrtionindicatorlighi off'97 model:P.ess and hold th6 recircul.tioncontrol switch'98 - 00 modek:Within six second3 atter theignition switch b turned ON (lll.Prass the rocirculation controlswitch the required number oltimes depending on the r6circu-lation indicator light striu3
,r*
/1.5 aaa 0.3 aac
RECIRCULANONINDICATOR LIGHT
In case of multiple problems, the recirculation indicator light indicate only one DTC that is the least number of blinks.
Resetiing the Solf.diagnosis Funqtion
Turning the ignition switch OFF will cancel the self-diagnosis function. After service work, run the self-diaqnosis functiononce again to check that there is no other Droblem.
MODE CONTROL OIAL
Diagnostic
trouble
code {DTCI
R6circulation
indicator lightComponent with problsmPossiblo causcSee page
'lOne blinkAir mix control molorOpen or short circuit, obstructed door,
faulty motor22-12
2Two blinksElower motorOpen or short circuit, faultv motor22-14,16
Three blinksEvaporator temperature sensorOpon or short circuit, faulty sensor22-20
t
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Page 1102 of 1395

HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual
Troubleshooting
Air Mix Control Motor
Recirculation indicator light indicates Diagnostic Trouble Code (DTC) 1: A problem in the air mix control motor circuit.
The air mix control motor regulates the

Page 1103 of 1395

HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual
Ftom page 22.12HEATER CONTROL PANEL 2OP CONNECTOR
Wire side ol female terminals
Check tor a short to poweriCheck the same terminals forvoltage.
Repair shon lo power in the wi.ebetween the heater cont

Page 1130 of 1395

HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual
Troubleshooting
Heater Control Panel Input/Output Signals
HEATER CONTROL PANEL CONNECTORS
8P CONNECTOR
Wire side of female terminals
2OP CONNECTOR
8P CONNECTOR
Cavitylrvire cololSignalCavityWire colo

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