fuel ACURA TL 1995 Service Service Manual
[x] Cancel search | Manufacturer: ACURA, Model Year: 1995, Model line: TL, Model: ACURA TL 1995Pages: 1771, PDF Size: 62.49 MB
Page 836 of 1771
System Descriptio n
Vacuum Connection s
'95 - 9 6 models :
EVAPORATIV EEMISSION(EVAP)PURGE CONTRO L
SOLENOI D VALV E
CONTRO L BO X
pag e 11- 9
INTAK E AI R BYPAS S (IAB )
VACUU M TAN KTo EVAPORATIV E
EMISSIO N (EVAP )
TW O WA Y VALV E
FRON T O F
VEHICL E
INTAK E AI R BYPAS S (IAB )
CONTRO L SOLENOI D VALV E INTAK
E AI R BYPAS S
(IAB ) CHEC K VALV E
WATERVALVECONTRO L
DIAPHRAG MEVAPORATIV
E EMISSIO N
(EVAP ) PURG E FLO WSWITC H
EXHAUS T GA S RECIRCULATIO N
(EGR ) VALV E an d LIF T SENSO R
INTAK E AI R
BYPAS S (IAB )
CONTRO L DIAPHRAG M
VALV E
FUELPRESSUR EREGULATO R
To ENGIN E
MOUN T CONTRO L
SOLENOI D VALV E EVAPORATIV
E
EMISSION(EVAP)CONTRO LCANISTER
ProCarManuals.com
Page 839 of 1771
System Description
Vacuum Connections (cont'd)
'95 - 96 models:
PRIMARY HEATED OXYGEN SENSOR (PRIMARY HO2S)
SECONDARY HEATED OXYGEN SENSOR (SECONDARY
HO2S)
MASS AIR FLOW (MAP) SENSOR
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
INTAKE AIR TEMPERATURE (IAT) SENSOR
FRONT KNOCK SENSOR (FKS)
REAR KNOCK SENSOR (RKS)
IDLE AIR CONTROL (IAC) VALVE
FAST IDLE THERMO VALVE
IDLE ADJUSTING SCREW
THROTTLE BODY (TB)
FUEL INJECTOR
FUEL FILTER
FUEL PRESSURE REGULATOR
FUEL PULSATION DAMPER
FUEL PUMP (FP)
FUEL TANK
FUEL TANK EVAPORATIVE EMISSION (EVAP) VALVE
AIR CLEANER
RESONATOR
CRANKSHAFT SPEED FLUCTUATION (CKF) SENSOR
INTAKE AIR BYPASS (IAB) CHECK VALVE
INTAKE AIR BYPASS (IAB) VACUUM TANK
INTAKE AIR BYPASS (IAB) CONTROL SOLENOID VALVE
INTAKE AIR BYPASS (IAB) CONTROL DIAPHRAGM
EXHAUST GAS RECIRCULATION (EGR) VACUUM CONTROL
VALVE
EXHAUST GAS RECIRCULATION (EGR) CONTROL
SOLENOID VALVE
EXHAUST GAS RECIRCULATION (EGR) VALVE
EXHAUST GAS RECIRCULATION (EGR) VALVE LIFT
SENSOR
POSITIVE CRANKCASE VENTILATION (PCV) VALVE
EVAPORATIVE EMISSION (EVAP) PURGE CONTROL
SOLENOID VALVE
EVAPORATIVE EMISSION (EVAP) PURGE FLOW SWITCH
EVAPORATIVE EMISSION (EVAP) CONTROL CANISTER
EVAPORATIVE EMISSION (EVAP) PURGE CONTROL
DIAPHRAGM VALVE
EVAPORATIVE EMISSION (EVAP) TWO WAY VALVE
WARM UP THREE WAY CATALYTIC CONVERTER (WU TWC)
THREE WAY CATALYTIC CONVERTER (TWC)
WATER VALVE CONTROL SOLENOID VALVE
WATER VALVE CONTROL DIAPHRAGM
WATER VALVE CHECK VALVEProCarManuals.com
Page 840 of 1771
'97 - 98 models:
Vacuum hose No.
PRIMARY HEATED OXYGEN SENSOR (PRIMARY HO2S)
SECONDARY HEATED OXYGEN SENSOR (SECONDARY
HO2S)
MASS AIR FLOW (MAP) SENSOR
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
INTAKE AIR TEMPERATURE (IAT) SENSOR
FRONT KNOCK SENSOR (FKS)
REAR KNOCK SENSOR (RKS)
IDLE AIR CONTROL (IAC) VALVE
FAST IDLE THERMO VALVE
IDLE ADJUSTING SCREW
THROTTLE BODY (TB)
FUEL INJECTOR
FUEL FILTER
FUEL PRESSURE REGULATOR
FUEL PULSATION DAMPER
FUEL PUMP (FP)
FUEL TANK
FUEL TANK EVAPORATIVE EMISSION (EVAP) VALVE
AIR CLEANER
RESONATOR
CRANKSHAFT SPEED FLUCTUATION (CKF) SENSOR
INTAKE AIR BYPASS (IAB) CHECK VALVE
INTAKE AIR BYPASS (IAB) VACUUM TANK
INTAKE AIR BYPASS (IAB) CONTROL SOLENOID VALVE
INTAKE AIR BYPASS (IAB) CONTROL DIAPHRAGM
EXHAUST GAS RECIRCULATION (EGR) VACUUM CONTROL
VALVE
EXHAUST GAS RECIRCULATION (EGR) CONTROL
SOLENOID VALVE
EXHAUST GAS RECIRCULATION (EGR) VALVE
EXHAUST GAS RECIRCULATION (EGR) VALVE LIFT
SENSOR
POSITIVE CRANKCASE VENTILATION (PCV) VALVE
EVAPORATIVE EMISSION (EVAP) PURGE CONTROL
SOLENOID VALVE
EVAPORATIVE EMISSION (EVAP) CONTROL CANISTER
EVAPORATIVE EMISSION (EVAP) CONTROL CANISTER
VENT SHUT VALVE
EVAPORATIVE EMISSION (EVAP) THREE WAY VALVE
EVAPORATIVE EMISSION (EVAP) TWO WAY VALVE
EVAPORATIVE EMISSION (EVAP) BYPASS SOLENOID
VALVE
FUEL TANK PRESSURE SENSOR
WARM UP THREE WAY CATALYTIC CONVERTER (WU TWC)
THREE WAY CATALYTIC CONVERTER (TWC)
WATER VALVE CONTROL SOLENOID VALVE
WATER VALVE CONTROL DIAPHRAGM
WATER VALVE CHECK VALVEProCarManuals.com
Page 854 of 1771
C110
C114
C115
C116
C117
C118
C119 ('95-96 models)
C121
C122
C123
C126
C127
C309
C314
C317
C322
C326 ('95 - 96 models)
C330
('97 - 98 models)
C331
('97 - 98 models)
C332
('97-98 models)
NOTE: • Different wires with the same color have been given a number suffix to distinguish them (for example, YEL/BLK1
and YEL/BLK2 are not the same).
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 sideProCarManuals.com
Page 856 of 1771
NOTE: • Different wires with the same color have been given a number suffix to distinguish them (for example,
YEL/BLK1 and YEL/BLK2 are not the same).
: 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
C402 C403 C405 C406
C415 C417 C419 C427
C429 C603 C612
C613ProCarManuals.com
Page 858 of 1771
C408
C432 ECM-A
C433 ECM-B
C434 ECM-C
*1:'95-96 models
*2:'97-98 models
C435 ECM-D
*1: '95 -96 models
*2: '97 - 98 models
NOTE: • Different wires with the same color have been given a number suffix to distinguish them (for example,
YEL/BLK1 and YEL/BLK2 are not the same).
: 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
C436
C407
C430ProCarManuals.com
Page 859 of 1771
System Descriptio n
System Connector s [Das h an d Floor ] (cont'd )
DASHBOAR DWIREHARNES S
C463
REA RHARNES S
C519/C77 1
FUEL UNI TSUB-HARNES S
C773
MAIN
WIRE HARNESS
C455/C622
C449
C444
C44 6
C441C44 0
ProCarManuals.com
Page 860 of 1771
NOTE: • Different wires with the same color have been given a number suffix to distinguish them (for example,
YEL/BLK1 and YEL/BLK2 are not the same).
: 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
C519 C773
C446 C449 C455 C463
C440 C441 C444ProCarManuals.com
Page 867 of 1771
Troubleshooting
Troubleshooting Procedures (cont'd)
ECM Data
By connecting the OBD II scan tool or the Honda PGM Tester to the 16P data link connector (DLC), various data can be
retrieved from the ECM. The items listed in the table below conform to the SAE recommended practice.
The Honda PGM Tester also reads data beyond that recommended by SAE.
Understanding this data will help to find the causes of intermittent failures or engine problems.
NOTE:
• The "operating values" given below are approximate values and may be different depending on the environment and
the individual vehicle.
• Unless noted otherwise, "at idle speed" means idling with the engine completely warmed up, the transmission in posi-
tion or , and the A/C and all accessories turned off.
Data
Description
Operating Value
Freeze Data
Diagnostic
Trouble Code
(DTC)
If the ECM detects a problem, it will store it as a code
consisting of one letter and four numbers.
Depending on the problem, an SAE-defined code
(P0xxx)
or a
Honda-defined code
(P1xxx)
will
be
output
to the tester.
If no problem is detected,
there is no output.
Engine Speed
The ECM computes engine speed from the signals sent
from the Crankshaft Position sensor.
This data is used for determining the time and amount
of fuel injection.
Nearly the same as
tachometer indication
At idle speed:
700 ± 50 rpm
Vehicle Speed
The ECM converts pulse signals from the Vehicle
Speed Sensor (VSS) into speed data.
Nearly the same as
speedometer indication
Mass Air
Flow (MAF)
The MAF sensor measures the volume of the air that
flows into the engine, and sends voltage signals to the
ECM.
At idle speed:
2.2 - 4.4 g/sec
At 2,500 rpm with not
load:
7.5- 13.0 g/sec
Engine Coolant
Temperature
(ECT)
The ECT sensor converts coolant temperature into
voltage and signals the ECM. The sensor is a thermistor
whose internal resistance changes with coolant
temperature. The ECM uses the voltage signals from
the ECT sensor to determine the amount of injected
fuel.
With cold engine:
Same as ambient temper-
ature and IAT
With engine warmed up:
90 - 96°C
Heated Oxygen
Sensor (HO2S)
(Primary)
(Secondary)
The Heated Oxygen Sensor detects the oxygen content
in the exhaust gas and sends voltage signals to the
ECM. Based on these signals, the ECM controls the
air/fuel ratio. When the oxygen content is high (that is,
when the ratio is leaner than the stoichiometric ratio),
the voltage signal is lower. When the oxygen content is
low (that is, when the ratio is richer than the stoichio-
metric ratio), the voltage signal is higher.
0.0-1.25V
At idle speed:
about 0.1-0.9VProCarManuals.com
Page 868 of 1771
Data
Description
Operating Value
Freeze Data
HO2S
Feedback
Loop Status
Loop status is indicated as "open" or "closed".
Closed: Based on the HO2S output, the ECM deter-
mines the air/fuel ratio and controls the amount of
injected fuel.
Open: Ignoring HO2S output, the ECM refers to signals
from the TP, MAF, and ECT sensors to control the
amount of injected fuel.
At idle speed: closed
Short Term
Fuel Trim
The air/fuel ratio correction coefficient for correcting
the amount of injected fuel when H02S feedback is in
the closed loop status. When the signal from the H02S
is weak, short term fuel trim gets higher, and the ECM
increases the amount of injected fuel. The air/fuel ratio
gradually gets richer, causing a higher HO2S output.
Consequently, the short term fuel trim is lowered, and
the ECM reduces the amount of injected fuel. This
cycle keeps the air/fuel ratio close to the stoichiometric
ratio when in closed loop status.
±20%
Long Term
Fuel Trim
Long term fuel trim is computed from short term fuel
trim and indicates changes occurring in the fuel supply
system over a long period.
If long term fuel trim is higher than 1.00, the amount of
injected fuel must be increased. If it is lower than 1.00,
the amount of injected fuel must be reduced.
±20%
Intake Air
Temperature
(IAT)
The IAT sensor converts intake air temperature into
voltage and signals the ECM. When intake air tempera-
ture is low, the internal resistance of the sensor
increases, and the voltage signal is higher.
With cold engine:
Same as ambient temper-
ature and ECT
Throttle
Position
Based on the accelerator pedal position, the opening
angle of the throttle valve is indicated.
At idle speed:
approx. 10%
Ignition
Timing
Ignition timing is the ignition advance angle set by the
ECM. The ECM matches ignition timing to the driving
conditions.
At idle speed: 15° ±2°
BTDC with the SCS service
connector connected.
Calculated
Load Value
(CLV)
CLV is the engine load calculated from the MAF data.
At idle speed:
14-27%
At 2,500 rpm with no load:
13-26%ProCarManuals.com