Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 830
6E–49
3.2L ENGINE DRIVEABILITY AND EMISSIONS
INJ. PULSE BANK 1 – Tech 2 Range 0-1000 msec. –
Indicates the amount of time the ECM is commanding
each injector “ON” during each engine cycle. A longer
injector pulse width will cause more fuel to be delivered.
Injector pulse width should increase with increased
engine load.
LONG TERM FUEL TRIM BANK 1
The long term fuel trim is derived from the short term fuel
trim values and represents a long term correction of fuel
delivery for the bank in question. A value of 0% indicates
that fuel delivery requires no compensation to maintain
the ECM commanded air/fuel ratio. A negative value
significantly below 0% indicates that the fuel system is
rich and fuel delivery is being reduced (decreased injector
pulse width). A positive value significantly greater than
0% indicates that a lean condition exists and the ECM is
compensating by adding fuel (increased injector pulse
width). Because long term fuel trim tends to follow short
term fuel trim, a value in the negative range due to
canister purge at idle should not be considered unusual.
Fuel trim values at maximum authority may indicate an
excessively rich or lean system.
MAF — Tech 2 Range 0.0-512 g/s —
MAF (mass air flow) is the MAF input frequency
converted to grams of air per second. This indicates the
amount of air entering the engine.
MIL — Tech 2 Displays ON or OFF —
Indicates the ECM commanded state of the malfunction
indicator lamp.
POWER ENRICHMENT — Tech 2 Displays ACTIVE
or INACTIVE —
“ACTIVE” displayed indicates that the ECM has detected
conditions appropriate to operate in power enrichment
mode. The ECM will command power enrichment mode
when a large increase in throttle position and load is
detected. While in power enrichment mode, the ECM will
increase the amount of fuel delivered by entering open
loop and increasing the injector pulse width. This is done
to prevent a possible sag or hesitation from occurring
during acceleration.
SPARK — Tech 2 Range –64
°
to 64
°
—
Displays the amount of spark advance being commanded
by the ECM on the IC circuit.
START-UP ECT — Tech 2 Range –40
°
C to 151
°
C
(–40
°
F to 304
°
F) —
Indicates the engine coolant temperature at the time that
the vehicle was started. Used by the HO2S diagnostic to
determine if the last start-up was a cold start.
TP — Tech 2 Range 0%-100% —
TP (throttle position) angle is computed by the ECM from
the TP sensor voltage. TP angle should display “0%” at
idle and “100%” at wide open throttle.
TP SENSOR — Tech 2 Range 0.00-5.00 Volts —
The voltage being monitored by the ECM on the TP
sensor signal circuit.
CATALYST PROTECTION MODE— Tech 2 Displays
YES or NO —
“YES” displayed indicates that the ECM has detected
conditions appropriate to operate in TWC protection
mode. The ECM will decrease the air/fuel ratio to a value
that depends on mass air flow (higher mass air flow =
lower air/fuel ratio).
WEAK CYLINDER –Tech 2 Displays Cylinder
Number—
This indicates that the ECM has detected crankshaft
speed variations that indicate 2% or more cylinder firing
events are misfires.
Typical Scan Data Values
Use the Typical Scan Data Values Table only after the
On-Board Diagnostic System Check has been
completed, no DTC(s) were noted, and you have
determined that the on-board diagnostics are functioning
properly. Tech 2 values from a properly-running engine
may be used for comparison with the engine you are
diagnosing. The typical scan data values represent
values that would be seen on a normally-running engine.
NOTE: A Tech 2 that displays faulty data should not be
used, and the problem should be reported to the Tech 2
manufacturer. Use of a faulty Tech 2 can result in
misdiagnosis and unnecessary replacement of parts.
Only the parameters listed below are referred to in this
service manual for use in diagnosis. For further
information on using the Tech 2 to diagnose the ECM and
related sensors, refer to the applicable reference section
listed below. If all values are within the typical range
described below, refer to the
Symptoms section for
diagnosis.
Test Conditions
Engine running, lower radiator hose hot, transmission in
park or neutral, closed loop, accessaries off, brake not
applied and air conditioning off.
6E–50
3.2L ENGINE DRIVEABILITY AND EMISSIONS
3.2L V-6 Engine (Automatic and Manual Transmission)
Tech 2
Parameter
Data List
Units
Displayed
Typical Data
Values (IDLE)
Typical Data
Values
(2500 RPM)
Refer To
A/C Clutch
Engine
On/Off
Off
Off
General Description and
Operation, A/C Clutch
Circuit Operation
A/C Request
Engine
On/Off
Off
Off
General Description and
Operation, A/C Request
Signal
Air/Fuel Ratio
Engine
Ratio: _ to
1
14.7
14.7
General Description and
Operation, Fuel System
Metering Purpose
Barometric
Pressure
Engine
kpa
Depend
barometric
pressure
Depend
barometric
pressure
—
Catalyst
Protection Mode
Engine
Yes/No
—
—
—
Check Trans
Lamp (Auto
Trans)
Engine
On/Off
Off
Off
Automatic Transmission
Diagnosis
CMP Act.
Counter (Cam
Position Activity)
Engine
Counts
0-255, always
increasing
0-255, always
increasing
DTC P0341 and P0342
Deceleration
Fuel Mode
Engine
On/Off
Off
Off
General Description and
Operation, Deceleration
Mode
Desired Idle
Engine
RPM
760
2500
General Description and
Operation, Idle Air Control
(IAC) Valve
ECT (Engine
Coolant Temp)
Engine
Degrees C,
Degrees F
80-100
°
C
(176-212
°
F)
80-100
°
C
(176-212
°
F)
General Description and
Operation, Engine Coolant
Temperature (ECT)
Sensor
Engine Load
Engine
Percent
2.0% - 5.5%
9.0% - 20.0%
General Description and
Operation, Mass Air Flow
(MAF) Sensor
Time From Start
Engine
Sec
Varies. Resets
at each engine
start.
Varies. Resets
at each engine
start.
—
Engine Speed
Engine
RPM
Within –50 to
+100 of
“Desired Idle”
Actual engine
speed
DTCs: P1508, P1509
Fuel Pump
Engine
On/Off
On
On
Engine Fuel
Fuel Trim Cell
Engine
Cell
number
49, 50, 51
21, 22, 23
Diagnosis, Fuel Trim Cell
Diagnostic Weights
Fuel Trim
Leaned
Engine
Yes/No
No
Yes
Diagnosis, Fuel Trim
Monitor
HO2S Sen.
(millivolts)
Engine
Millivolts
50-950
changing slowly
50-950
changing slowly
General Description and
Operation
HO2S
(ready/not
ready)
Engine
Ready
Yes/No
Ready
Yes
Ready
Yes
General Description and
Operation, Fuel Control
HO2S; DTC: P0135
IAC Position
Engine
Steps
5-50
10-70
—
6E–51
3.2L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
Parameter
Data List
Units
Displayed
Typical Data
Values (IDLE)
Typical Data
Values
(2500 RPM)
Refer To
IAT (Intake Air
Temp)
Engine
Degrees C,
Degrees F
0-100
°
C,
depends on
underhood
0-80
°
C,
depends on
underhood
General Description and
Operation, Intake Air
Temperature (IAT) Sensor
Ignition Voltage
Engine
Volts
12.8-14.5
12.8-14.5
General Description and
Operation, Electronic
Ignition System
Inj. Pulse Bank
1
Engine
Millisecond
s
2.0-4.0
2.5-4.5
General Description, Fuel
Metering, Fuel Injector
Long Term FT
Bank 1 (Long
Term Fuel Trim)
Engine
Counts
and
Percent
counts, –12% to
+17%
counts, –10% to
+15%
Diagnosis, Fuel Trim
System Monitor; DTCs:
P0171, P0172
MAF (Mass Air
Flow)
Engine
Grams per
second
2.85-6.65
9.5-16.5
General Description and
Operation, MAF; DTCs:
P101, P0102, P0103
MIL
(Malfunction
Indicator Light)
Engine
On/Off
Off
Off
On-Board Diagnostic
System Check
EVAP Purge
Solenoid
Engine
%
—
—
—
PSP Switch
(Power Steering
Pressure)
Engine
Normal/Hig
h Pressure
Normal
Normal
Power Steering Gear and
Pump, General
Description, pressure
Switch
Power
Enrichment
Engine
Yes/No
No
No
General Description and
Operation, Acceleration
Mode
B1S1 (Short
Term)
Engine
Rich/Lean
Always
changing
Always
changing
General Description and
Operation, Fuel Control
HO2S
Shrt Term FT
Bank 1 (Short
Term Fuel Trim)
Engine
Counts
and
Percent
112 to 154
counts, –12% to
+20%
112 to 154
counts, –12% to
+20%
Diagnosis, Fuel Trim
System Monitor; DTCs:
P0171, P0172
Spark
(Advance)
Engine
Degrees
Before Top
Dead
Center
10-15
°
CA
34-44
°
CA
General Description and
Operation, Electronic
Ignition System
Start-Up ECT
(Engine Coolant
Temp)
Engine
Degrees C,
Degrees F
Depends on
engine coolant
temperature at
time of start-up
Depends on
engine coolant
temperature at
time of start-up
General Description and
Operation, Engine Coolant
Temperature (ECT)
Sensor
TCC Engaged
(Torque
Converter
Clutch)
Engine
No/Yes
No
No
Transmission Diagnosis
Torque
Management
Engine
Inactive/Ac
tive
Inactive
Inactive
Transmission Diagnosis
TP (Throttle
Position)
Engine
Percent
0
5-10
General Description and
Operation, Throttle
Position (TP) Sensor;
DTCs: P0121,
P0122,P0123
6E–52
3.2L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
Parameter
Data List
Units
Displayed
Typical Data
Values (IDLE)
Typical Data
Values
(2500 RPM)
Refer To
TP Sensor
(Throttle
Position)
Engine
Volts
0.4-0.7
0.60-1.00
General Description and
Operation, Throttle
Position (TP) Sensor;
DTCs: P0121,
P0122,P0123
Vehicle Speed
Engine
MPH /
km/h
0
0
Transmission Diagnosis
Fuel System
Status
Engine
Open /
Close loop
Close loop
Close loop
General Description
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст