Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 205

ENGINE DRIVEABILITY AND EMISSIONS

6E–61

Reading Diagnostic Trouble Codes Using a
Tech 2

The procedure for reading diagnostic trouble code(s) is
to used a diagnostic Tech2. When reading DTC(s),
follow instructions supplied by Tech2 manufacturer.

Clearing Diagnostic Trouble Codes

To clear Diagnostic Trouble Codes (DTCs), use the
Tech2 “clear DTCs” or “clear information” function.
When clearing DTCs follow instructions supplied by the
Tech2 manufacturer.

Diagnosis With Tech 2

If no codes are set:

• Refer to F1: Data Display and identify the electrical

faults that are not indicated by trouble code.

• Refer to “SYMPTOM DIAGNOSIS”.

If codes are set:

1. Record all trouble codes displayed by Tech 2 and

check id the codes are intermittent.

2. Clear the codes.

3. Drive the vehicle for a test to reproduce the faulty

status.

4. Check trouble codes again using the Tech 2.

5. If no codes is displayed by test driving, the fault is

intermittent. In this case, refer to “DIAGNOSIS
AIDS”.

6. If a code is present, refer to DTC Chart for

diagnosis.

7. Check trouble codes again using the Tech 2.

Tech 2 CONNECTION

Tech 2 scan tool is used to electrically diagnose the
automatic transmission system and to check the
system. The Tech 2 enhances the diagnosis efficiency
though all the troubleshooting can be done without the
Tech 2.

1. Configuration of Tech 2

• Tech 2 scan tool kit (No. 7000086), Tech 2 scan

tool (No. 7000057) and DLC cable (No. 3000095).

• SAE 16/19 adapter (No. 3000098) (3), RS232

loop back connector (No. 3000112) (2) and
PCMCIA card (No. 3000117) (1).

2. Tech 2 Connection

• Check the key switch is turn OFF.

• Insert the PCMCIA card (1) into the Tech 2 (5).

• Connect the SAE 16/19 adapter (3) to the DLC

cable (4).

• Connect the DLC cable (4) to the Tech 2 (5).

• Connect the SAE 16/19 adapter (3) to the data

link connector of the vehicle.

• Turn the key switch of the vehicle ON and press

the “PWR” key of the Tech 2.

• Check the display of the Tech 2.

NOTE: Be sure to check that the power is not supplied
to the Tech 2 when attaching or removing the PCMCIA
card.

6E–62

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.

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

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”.

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–63

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.

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.

F4: Programming (Factory Use Only)
The purpose of “Programming” is to program VIN in the
ECM and lock the programmed data.

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

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

F4: Programming

F0: Program VIN

6E–64

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

Engine Speed

rpm

775 - 875

1950 - 2050

The actual engine speed is measured by ECM from the
CKP sensor 58X signal.

Desired Idle Speed

rpm

825

800

850

The desired engine idle speed that the ECM
commanding. The ECM compensates for various engine
loads.

Engine Coolant
Temperature

°C or °F

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.

Start Up ECT (Engine
Coolant Temperature)

°C or °F

Depends on engine

coolant temp. at

time of start-up

Depends on engine

coolant temp. at

time of start-up

Start-up ECT is measured by ECM from ECT sensor
output voltage when engine is started.

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.

Start Up IAT (Intake
Air Temperature)

°C or °F

Depends on

ambient temp. at

start-up

Depends on

ambient temp. at

start-up

Start-up IAT is measured by ECM from IAT sensor output
voltage when engine is started.

Manifold Absolute
Pressure

Kpa

33 - 38

26 - 30

The MAP (Kpa) is measured by ECM from MAP output
voltage. This data is changing by inlet manifold pressure.

Throttle Position

2 - 5

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.

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.

Calculated Air Flow

g/s

4.0 - 5.0

8.0 - 10.0

Air Fuel Ratio

14.6:1

This displays the ECM commanded value. In closed loop,
this should normally be displayed around 14.2:1 - 14.7:1.

Spark Advance

°CA

10 - 15

This displays the amount of spark advance being
commanded by the ECM.

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.

Injection Pulse Width

3.0 - 4.5

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.

Fuel System Status

Open 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.

Knock Present

Yes/No

Knock Counter

Knock Retard

°CA

This displays the commanded ignition spark timing retard
timing based on the signal from the knock sensor.

A/C Clutch Relay

On/Off

Off

This displays whether the ECM has commanded the A/C
compressor clutch “On” or “Off”.

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