Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Service manual — part 114
6E–60
4JH1 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
1500rpm
2000rpm
Description
1
Engine Speed
rpm
675 - 725
1475 - 1525
1975 - 2025
The engine speed is measured by ECM from the CKP
sensor.
2
Vehicle
Speed
km/h
0
0
0
This displays vehicle speed. The vehicle speed is
measured by ECM from the vehicle speed sensor.
3
Pump Speed
rpm
335 - 375
725 - 775
975 - 1025
This displays injection pump speed. The injection speed
is measured by ECM from the pump cam sensor.
4
Accelerator
Position Signal
Value of ( ) shows
A/T model
%
0
(0)
3 - 6
(4 - 7)
5 - 8
(8 - 11)
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.
5
Idle Switch
Active/ Inactive
Active
Active
Inactive
This displays operating status of the idle switch. This
should display “Active” when the idle condition.
6
Mass Air Flow
Sensor
Value of ( ) shows
A/T model
mg/strk
410 - 490
(730 - 785)
380 - 450
(700 - 780)
400 - 480
(780 - 830)
This displays intake air amount. The mass air flow is
measured by ECM from the MAF sensor output voltage.
7
Barometric
Pressure
hpa
990 - 1015
990 - 1015
990 - 1015
The barometric pressure is measured by ECM from the
sensor in the ECM. This data is changing by altitude.
8
Desired Injection
Quantity
Value of ( ) shows
A/T model
mg/stk
5 - 8
(10 - 16)
5 - 9
(8 - 12)
6 - 10
(9 - 13)
This displays commanded value from the ECM. The ECM
compensates for fuel rate to basic rate.
9
Injection Quantity
Value of ( ) shows
A/T model
mg/stk
6 - 8
(10 - 16)
6 - 9
(8 - 12)
7 - 10
(9 - 13)
This displays actual fuel quantity. The PSG controls high
pressure solenoid valve to meet commanded value from
the ECM.
10
Desired Fuel
Injection Start
°CA
1 - 3
2 - 4
3 - 6
This displays commanded value from the ECM. The ECM
compensates for fuel injection timing by throttle position
and various sensor signal.
11
Actual Injection
Start
°CA
1 - 3
2 - 4
3 - 6
This displays actual injection timing value controlled by
the TCV. The TCV controls duty ratio to meet
commanded value from the PSG.
12
Coolant
Temperature
°C
80 - 85
80 - 85
80 - 85
The ECT is measured by ECM from ECT sensor output
voltage. This data is changing by coolant temperature.
When the engine is normally warm upped, this data
displays approximately 80 deg.
13
Fuel Temperature
°C
25 - 50
25 - 50
25 - 50
The FT is measured by PSG from FT sensor. This data is
changing by fuel temperature.
14
Intake Air
Temperature
°C
25 - 50
25 - 50
25 - 50
The IAT is measured by ECM from IAT sensor output
voltage. This data is changing by intake air temperature.
15
Ignition Status
On12V/ Off0V
On 12V
On 12V
On 12V
This displays the key switch status indicated by the ECM
with key switch signal. This should display “Off 0V” at key
OFF and “On12V” at key ON.
16
Brake Switch 1
Active/ Inactive
Inactive
Inactive
Inactive
This displays operating status of the brake switch 1. This
should display “Active” when the brake pedal is stepped
on.
17
Brake Switch 2
Active/ Inactive
Inactive
Inactive
Inactive
This displays operating status of the brake switch 2. This
should display “Active” when the brake pedal is stepped
on.
18
Clutch Switch
Value of ( ) shows
A/T model
Active/ Inactive
Inactive
( - )
Inactive
( - )
Inactive
( - )
This displays operating status of the clutch switch. This
should display “Active” when the clutch pedal is stepped
on.
19
Neutral Switch
On/Off
On
On
On
This displays operating status of the neutral switch. This
should display “On” when the gear position is neutral.
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6E–61
20
A/C Information
Switch
Active 12V/
Inactive 0V
Inactive 0V
Inactive 0V
Inactive 0V
This displays the air conditioner request signal. This
should display “Active 12V” when the air conditioner
switch is switched on.
21
Diagnostic
Request
Active 0V/
Inactive 12V
Inactive
12V
Inactive
12V
Inactive
12V
This displays the diagnostic request signal. This should
display “Inactive 12V” when the Tech 2 is connected.
22
System Voltage
V
10 -14
10 -14
10 -14
This displays the system voltage measured by the ECM
at ignition feed.
23
Main Relay
Active/ Inactive
Active
Active
Active
This displays operating status for the ECM main relay.
This should display “Inactive” at key OFF and “Active” at
key ON.
24
Glow Time Relay
Active 0V/
Inactive12V
Inactive
12V
Inactive
12V
Inactive
12V
This displays operating status for the glow relay. This
should display “Inactive 12V” when the engine is warm
upped.
25
Check Engine
Lamp
On/Off
Off
Off
Off
This displays operating status for the Check Engine
Lamp. This should display “On” when the Check Engine
Lamp is turned on.
26
Glow Time Telltale
On/Off
Off
Off
Off
This displays operating status for the glow indicator lamp.
This should display “On” when the glow lamp is turned
on.
27
Desired Engine
Idle Speed
rpm
700
700
700
The desired engine idle speed that the ECM
commanding. The ECM compensates for various engine
loads based on engine coolant temperature.
28
Start of Delivery
°CA
18 - 22
20 - 25
22 - 26
This displays commanded value from the ECM when
engine start.
29
A/C Request
Active 0V/
Inactive 12V
Inactive
12V
Inactive
12V
Inactive
12V
This displays operating status of the A/C compressor.
This should display “Active 0V” when the compressor
relay is operated.
30
Immobiliser
Active/ Inactive
Inactive
Inactive
Inactive
This should display “Inactive” when the immobiliser is
normal.
31
Immobiliser Signal
Received/ Not
Received
Not
Received
Not
Received
Not
Received
This should display “Not Received” when the immobiliser
is not activated.
32
Immobiliser
Function
Programmed
Yes/No
Yes
Yes
Yes
This should display “Yes” when the immobiliser is
programmed.
Tech 2 Parameter
Units
Idle
1500rpm
2000rpm
Description
6E–62
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
MISCELLANEOUS TEST
The state of each circuit can be tested by using
miscellaneous test menus. Especially when DTC cannot
be detected, a faulty circuit can be diagnosed by testing
each circuit by means of these menus.
Even DTC has been detected, the circuit tests using
these menus could help discriminate between a
mechanical trouble and an electrical trouble.
Connect Tech 2 and select “Powertrain”, “4JH1-TC
Bosch” & “Miscellaneous Test”.
F0: Lamps
F0: Check Light
When the Tech 2 is operated, “Malfunction Indicator
Lamp (Check Engine Lamp)” is turned on or off.
The circuit is normal if the “Malfunction Indicator Lamp
(Check Engine Lamp)” in the instrument panel is turned
on or off in accordance with this operation.
F1: Glow Time Telltale Test
When the Tech 2 is operated, “Glow Indicator Lamp” is
turned on or off.
The circuit is normal if the “Glow Indicator Lamp” in the
instrument panel is turned on or off in accordance with
this operation.
F1: Relays
F0: Glow Time Relay Test
When the Tech 2 is operated, glow relay signal turns ON
or OFF.
The circuit is normal if glow system is activated/
deactivated in accordance with this operation when key
switch is turned ON.
F2: Engine Speed (RPM) Control
When the Tech 2 is operated, “Desired Idle Speed”
increases 50rpm-by-50rpm up to 1200rpm.
The circuit is normal if engine speed is changed in
accordance with this operation.
• Press “Increase” key.
Then, Desired Idle speed increases 50rpm-by-50rpm
up to 1200rpm. Engine speed is also changed by this
operation.
• Press “Quit” Key.
Engine Speed (RPM) Control
Engine Speed
850 RPM
Desired Idle Speed
850 RPM
Injection Quantity
7.5mg/strk
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6E–63
Plotting Snapshot Graph
This test selects several necessary items from the data
list to plot graphs and makes data comparison on a long
term basis. It is an effective test particularly in emission
related evaluations.
For trouble diagnosis, you can collect graphic data
(snap shot) directly from the vehicle.
You can replay the snapshot data as needed. Therefore,
accurate diagnosis is possible, even though the vehicle
is not available.
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