Isuzu KB P190. Manual — part 560
6E–70
ENGINE DRIVEABILITY AND EMISSIONS
Tech 2 Operating Flow Cart (Start Up)
Select “2.XL L4 HV240” in Vehicle Identification menu and the following table is shown in the Tech 2 screen.
System Selection Menu
F0: Powertrain
F1: Chassis
F3: Body
Select “(TF/UC)”.
Vehicle Identification
4JH1-TC Bosch
4JH1-T Denso
2.XL L4 HV240
3.5L V6 6VE1 Hitachi
AW30-40LE
AT JR405E
Select “F0: Powertrain”.
Main Menu
F0: Diagnostic
F1: Service Programming System (SPS)
F2: View Capture Data
F3: Tool Option
F4: Download/ Upload Help
Press “ENTER” key.
Vehicle Identification
(3) 2003
(2) 2002
(1) 2001
(Y) 2000
(X) 1999
(W) 1998
Select “F0: Diagnostic”.
Select “(3) 2003” or later.
Press (ENTER) to Continue
Select “2.XL L4 HV240”.
Vehicle Identification
(UB) Trooper, Bighorn
(UE) Rodeo,/Amigo, Wizard/Mu
(TF/UC) LUV, Frontier, LAO-Rodeo
(TBR)
(N*) ELF, NPR, NQR
ENGINE DRIVEABILITY AND EMISSIONS
6E–71
F0: Diagnostic Trouble Code
The purpose of the “Diagnostic Trouble Codes” mode is
to display stored trouble code in the ECM.
When “Clear DTC Information” is selected, a “Clear
DTC Information”, warning screen appears.
This screen informs you that by cleaning DTC's “all
stored DTC information in the ECM will be erased”.
After clearing codes, confirm system operation by test
driving the vehicle.
Use the “DTC Information” mode to search for a specific
type of stored DTC information.
History
This selection will display only DTCs that are stored in
the ECM's history memory. It will not display Type B
DTCs that have not requested the MIL (“Check Engine
Lamp”). It will display all type A and B DTCs that
requested the MIL and have failed within the last 40
warm-up cycles. In addition, it will display all type C and
D DTCs that have failed within the last 40 warm-up
cycles.
MIL SVC or Message Request
This selection will display only DTCs that are requesting
the MIL. Type C and Type D DTCs cannot be displayed
using the MIL. Type C and D DTCs cannot be displayed
using this option.
This selection will report type B DTCs only after the MIL
has been requested.
Last Test Failed
This selection will display only DTCs that have failed the
last time the test run. The last test may have run during
a previous ignition cycle of a type A or type B DTC is
displayed. For type C and type D DTCs, the last failure
must have occurred during the current ignition cycle to
appear as last test fail.
Test Failed Since Code Cleared
The selection will display all active and history DTCs
that have reported a test failure since the last time
DTCs were cleared. DTCs that last failed more that 40
warm-up cycles before this option is selected will not be
displayed.
No Run Since Code Cleared
This selection will display up to DTCs that have not run
since the DTCs were last cleared. Since any displayed
DTCs have not run, their condition (passing or failing) is
unknown.
Failed This Ignition
This selection will display all DTCs that have failed
during the present ignition cycle.
F1: Data Display
The purpose of the “Data Display” mode is to
continuously monitor data parameters.
The current actual values of all important sensors and
signals in the system are display through F1 mode.
See the “Typical Scan Data” section.
F2: Snapshot
“Snapshot” allows you to focus on making the condition
occur, rather than trying to view all of the data in
anticipation of the fault.
The snapshot will collect parameter information around
a trigger point that you select.
F3: Miscellaneous Test:
The purpose of “Miscellaneous Test” mode is to check
for correct operation of electronic system actuators.
F0: Diagnostic Trouble Code
F0: Read DTC Infor By Priority
F1: Clear DTC Information
F2: DTC Information
F0: History
F1: MIL SVS or Message Requested
F2: Last Test Failed
F3: Test Failed Since Code Cleared
F4: Not Run Since Code Cleared
F5: Failed This Ignition
F1: Data Display
F0: Engine Data
F1: O
2
Sensor Data
F2: Snapshot
F3: Miscellaneous Test
F0: Lamps
F0: Malfunction Indicator Lamps
F1: Relays
F0: Fuel Pump Relay
F1: A/C Clutch Relay
F2: EVAP
F0: Purge Solenoid
F3: IAC System
F0: IAC Control
F1: IAC Reset
F4: Injector Balance Test
6E–72
ENGINE DRIVEABILITY AND EMISSIONS
TYPICAL SCAN DATA & DEFINITIONS (ENGINE DATA)
Use the Typical 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.
Condition : Vehicle stopping, engine running, air conditioning off & after warm-up (Coolant temperature approximately
80 deg.)
Tech 2 Parameter
Units
Idle
2000rpm
Description
1
Engine Speed
rpm
775 - 875
1950 - 2050
The actual engine speed is measured by ECM from the
CKP sensor 58X signal.
2
Desired Idle Speed
rpm
825
800
-
850
The desired engine idle speed that the ECM
commanding. The ECM compensates for various engine
loads.
3
Engine Coolant
Temperature
°C or °F
80 - 90
80 - 90
The ECT is measured by ECM from ECT sensor output
voltage. When the engine is normally warm upped, this
data displays approximately 80 °C or more.
4
Start Up ECT (Engine
Coolant Temperature)
°C or °F
Depends on ECT
at start-up
Depends on ECT
at start-up
Start-up ECT is measured by ECM from ECT sensor
output voltage when engine is started.
5
Intake Air
Temperature
°C or °F
Depends on
ambient temp
Depends on
ambient temp
The IAT is measured by ECM from IAT sensor output
voltage. This data is changing by intake air temperature.
6
Start Up IAT (Intake
Air Temperature)
°C or °F
Depends on IAT at
start-up
Depends on IAT at
start-up
Start-up IAT is measured by ECM from IAT sensor output
voltage when engine is started.
7
Manifold Absolute
Pressure
kPa
31 - 36
25 - 30
The MAP (kPa) is measured by ECM from MAP output
voltage. This data is changing by inlet manifold pressure.
8
Barometric Pressure
kPa
Depends on
altitude
Depends on
altitude
The barometric pressure is measured by ECM from the
MAP sensor output voltage monitored during key up and
wide open throttle. This data is changing by altitude.
9
Throttle Position
%
0
2-4
Throttle position operating angle is measured by the
ECM from throttle position output voltage. This should
display 0% at idle and 99 - 100% at full throttle.
10
Calculated Air Flow
g/s
3.5 -4.50
8.0 - 10.0
This displays calculated air mount from MAP sensor
output. This data is changing by inlet manifold pressure.
11
Air Fuel Ratio
14.6:1
14.6:1
This displays the ECM commanded value. In closed loop,
this should normally be displayed around 14.2:1 - 14.7:1.
12
Spark Advance
°CA
8 - 15
25
-
32
This displays the amount of spark advance being
commanded by the ECM.
13
Engine Load
%
2 - 5
5 - 10
This displays is calculated by the ECM form engine
speed and MAF sensor reading. Engine load should
increase with an increase in engine speed or air flow
amount.
14
Injection Pulse Width
ms
1.0 - 3.0
3.0
-
4.0
This displays 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.
15
Fuel System Status
Open Loop/
Close Loop
Close Loop
Close Loop
When the engine is first started the system is in “Open
Loop” operation. In “Open Loop”, the ECM ignores the
signal from the oxygen sensors. When various conditions
(ECT, time from start, engine speed & oxygen sensor
output) are met, the system enters “Closed Loop”
operation. In “Closed Loop”, the ECM calculates the air
fuel ratio based on the signal from the oxygen sensors.
16
Knock Present
Yes/No
No
No
This displays knock sensor detection status. When
engine knock is occurred, displays "Yes".
17
Knock Counter
-
-
This displays the number of knock during a ignition cycle.
18
Knock Retard
°CA
0
0
This displays the commanded ignition spark timing retard
timing based on the signal from the knock sensor.
19
A/C Clutch Relay
On/Off
Off
Off
This displays whether the ECM has commanded the A/C
compressor clutch “On” or “Off”.
ENGINE DRIVEABILITY AND EMISSIONS
6E–73
20
A/C Request
Yes/No
Off
Off
This displays the air conditioner request signal. This
should display “On” when the air conditioner switch is
switched on.
21
EVAP Purge Solenoid
(Evaporative
Emission)
%
0 - 10
0 - 10
This displays the duty signal from the ECM to control the
canister purge solenoid valve.
22
Fuel Pump
On/Off
On
On
This displays operating status for the fuel pump main
relay. This should display “On” when the key switch is
turned on and while engine is running.
23
Idle Air Control
Steps
20 - 30
65 - 75
This displays the ECM commanded position of the idle air
control valve pintle. A larger number means that more air
is being commanded through the idle air passage.
24
Idle Speed Variation
rpm
-25 - 0
1125 - 1225
This displays variation of actual engine speed & desired
idle speed.
25
Vehicle Speed
km/h or
mph
0
0
This displays vehicle speed. The vehicle speed is
measured by ECM from the vehicle speed sensor.
26
Ignition Voltage
V
10.0 - 14.5
10.0 - 14.5
This displays the system voltage measured by the ECM
at ignition feed.
27
Reference Voltage
V
5.00
5.00
28
Malfunction Indicator
Lamp
On/Off
Off
Off
This displays operating status for the Check Engine
Lamp. This should display “On” when the Check Engine
Lamp is turned on.
29
Time From Start
-
-
This displays the engine time elapsed since the engine
was started. If the engine is stopped, engine run time will
be reset to 00:00:00
Tech 2 Parameter
Units
Idle
2000rpm
Description
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