start ISUZU KB P190 2007 Workshop Repair Manual

Engine Management – V6 – Diagnostics Page 6C1-2–240

Cruise Control Switch: This parameter displays the state of the cruise control on/off switch input to the control module.
Cruise Control Disengagement Reason: The parameter displays which of a possible 28 causes for the cruise control
to disengage.
CC Disengagement 1 – 8 History (Cruise Control): The parameter displays the last 8 cruise control disengages in
order from 1 to 8, with 8 being the most recent. There are about 28 possible causes for the cruise control to disengage.
Cruise Resume/Acceleration Switch: This parameter displays the state of the cruise control resume/accel switch
position input to the ECM.
Cruise Set / Coast Switch: This parameter displays the state of the cruise controls set/decel. switch position input to
the ECM.
Cycles of Misfire: This parameter displays the number of misfire tests during 200 engine revolutions.
Cylinder 1 – 6 Injector Circuit Status: This parameter displays the state of the fuel injector control circuit. The
parameter displays ‘Fault’ if the fuel injector control circuit is open, shorted to ground, or shorted to voltage. This
parameter displays ‘Undefined Status’ until the control circuit has been commanded ‘On’.
Dec. Fuel Cutoff (Deceleration): This parameter displays the status of the ECM operating mode, used to turn off the
fuel injectors and the evaporative emission (EVAP) canister purge valve during certain deceleration conditions.
Desired Engine Idle Speed: This parameter displays the desired engine idle speed as commanded by the ECM.
Desired Throttle Position: This parameter displays the desired throttle position (TP) angle commanded by the ECM.
Distance Since DTC Cleared: This parameter displays the distance (km) travelled since any diagnostic trouble code
(DTC) has been cleared from the ECM memory.
DTC Set This Ignition: This parameter displays Yes if a DTC set on the current ignition cycle.
ECM Immobilized: This parameter displays ‘Yes’ when an internal control module reset occurs. Tech 2 will display ‘No’
under normal operating conditions.
Electronic Throttle Control Learn Counter: W hen the ECM performs a throttle body relearn procedure, the throttle
plate is commanded to move from the rest position (7% open) to full closed (0%), then to around 10% open.
At the start of this procedure, the Tech 2 ‘TAC Learn Counter’ parameter should display 0, then count up to 11 after the
procedure is completed. If the counter did not start at 0 or if the counter did not end at 11, a fault has occurred and a
DTC should set.
Engine Control Ignition Relay: This parameter displays the state of the control circuit for control module power relay
as commanded by the ECM.
Engine Control Ignition Relay Feedback: This parameter displays the voltage available at the engine control ignition
relay pin of the control module.
Engine Load: This parameter displays the calculated engine load in percent based on inputs to the control module from
various engine sensors.
Engine Oil Life Remaining: This parameter displays the percentage of engine oil life remaining. The controller
calculates the engine oil life by monitoring engine load, collant temperature and engine speed.
Engine Oil Pressure: This parameter displays the oil pressure in kPa from the ECM, developed from the engine oil
pressure (EOP) sensor input.
Engine Oil Pressure Sensor: This parameter displays ‘High’ if the engine oil pressure is within the correct range. If the
ECM detects that the engine oil pressure is not within the correct range, Tech 2 will display ‘Low’.
Engine Runtime: This parameter displays the time elapsed since the engine was started.
Engine Speed: This parameter displays the speed of the engine crankshaft rotation from information received from the
CKP sensor. If there is a CKP sensor DTC, the ECM calculates the engine speed from one of the camshaft position
(CMP) sensors.
EVAP Purge Solenoid (Evaporative Emission): This parameter displays the on-time or duty cycle of the EVAP
canister purge solenoid commanded by the ECM. Zero percent indicates no purge. One hundred percent indicates full
purge.
EVAP Purge Solenoid Valve Circuit Status (Evaporative Emission): This parameter displays the state of the EVAP
purge solenoid control circuit. The parameter displays ‘Fault’ if the EVAP purge solenoid control circuit is open, shorted
to ground, or shorted to voltage. The parameter displays ‘Undefined Status’ until the circuit has been established as
‘OK’.
Cooling Fan Relay: This parameter displays the control module commanded state of the fan relay control circuit.

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Engine Management – V6 – Diagnostics Page 6C1-2–242

Oil Temperature Sensor: This parameter displays the engine oil temperature in degrees C.
Power Enrichment: This parameter displays the status of the operating mode of the ECM used to increase fuel delivery
during certain acceleration conditions.
Reduced Engine Power: This parameter displays when the ECM is commanding reduced engine power due to a
throttle actuator control (TAC) system condition.
Requested Torque: This parameter displays the calculated amount torque requested of the ECM by the Transmission
Control Module (TCM).
Short Term Fuel Trim (Bank 1 or Bank 2): This parameter displays the short-term correction to the fuel delivery by the
ECM in response to oxygen sensor 1 or 2. If the oxygen sensor indicates a lean air/fuel mixture, the control module will
add fuel, increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control
module will reduce fuel decreasing the short term fuel trim below 0.
Spark Advance: This parameter displays the amount of spark advance the ECM is commanding on the ignition control
circuits. The ECM determines the desired advance.
Starter Relay: This parameter displays the Em’s commanded state of the starter motor relay control circuit.
Starter Relay Circuit Status: This parameter displays the state of the starter relay control circuit. The parameter
displays ‘Fault’ if the starter relay control circuit is open, shorted to ground, or shorted to voltage. The parameter
displays Undefined Status’ until the circuit has been determined as being ‘OK’. This parameter may not change if Tech 2
is used to command the relay control circuit ON.
Start Up ECT (Engine Coolant Temperature): This parameter displays the temperature of the engine coolant on start
up based on input to the ECM from the ECT sensor.
Start Up IAT (Intake Air Temperature): This parameter displays the temperature of the intake air at start in the air
induction system based on input to the ECM from the IAT sensor.
Time Since Engine Off: This parameter displays the amount of time (hours:minutes:seconds) that has elapsed since
the engine was last cycled OFF.
Total Fuel Trim (Bank 1 or Bank 2): This parameter displays the overall fuel trim from the idle/decel cell and the
cruise/accel cell.
Total Misfire: This parameter displays the total number of cylinder firing events that the control module detected as
misfires for the last 200 crankshaft revolution sample period.
TP Sensor 1 (Throttle Position): This parameter displays the actual voltage on the TP sensor 1 signal circuit as
measured by the ECM.
TP Sensor 1 Learned Lower Position (Throttle Position): This parameter displays the learned minimum value of TP
sensor 1 as recorded by the ECM during the last learn procedure.
TP Sensor 2 (Throttle Position): This parameter displays the actual voltage on the TP sensor 2 signal circuit as
measured by the ECM.
TP Sensor 2 Learned Lower Position (Throttle Position): This parameter displays the learned minimum value of TP
sensor 2 as recorded by the ECM during the last learn procedure.
TP Sensor 1-2 Correlation (Throttle Position): This parameter displays ‘Fault’ when the ECM detects that TP sensor 1
voltage signal is not within the correct relationship to TP sensor 2. Tech 2 displays ‘Okay’ under normal operating
conditions.
Transmission Gear: This parameter displays the position of the transmission gear selector that is transmitted over the
serial data circuit from the TCM.
Transmission Gear Selector Signal: This parameter displays the position of the transmission gear selector that is
transmitted over the serial data circuit from the TCM.
Vehicle Speed: This parameter displays the speed of the vehicle as calculated by the TCM from information received
from the vehicle speed sensor (VSS).
Volumetric Efficiency: This parameter displays the volumetric efficiency of the engine as calculated by the control
module.
8.5 OBD Data
Typical Values Tech 2 Display Units Displayed
Ignition On Engine Running
B1S1 O2 Sensor (Bank 1 Sensor 1) mA 0.008 0

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Engine Management – V6 – Diagnostics Page 6C1-2–245

Starter Motor Relay Test
The engine will crank and start during the
starter relay test.
Allows the Technician to turn the starter relay ‘On’, thereby activating the starter motor and cranking the engine.
Preconditions: Apply park brake, firmly apply foot brake, ignition ‘On’, engine ‘Off’, transmission in Park or Neutral.
Fuel Injector Balance
This test allows the Technician to check the fuel flow through each injector when the engine is not running. The
sequence of events are:
1 Install a fuel pressure gauge to the fuel rail.
2 Select ‘Fuel Injector Balance Test’, from the ‘Actuator Test’ menu on Tech 2
3 Activate the fuel injector balance test with Tech 2. This action activates the fuel pump and stabilises the fuel delivery system fuel pressure. The fuel pump is then turned off.
4 Note the stabilised fuel rail pressure.
5 W hen the pump is turned ‘Off’, the injector is activated for a pre-determined time.
6 The fuel pressure drop is then noted from the fuel pressure gauge.
NOTE
For a detailed procedure and analysis of fuel
injector condition, refer to 5.3 Fuel Injector
Balance Test.
8.7 Programming
F0: ICU Link to ECM/PIM : Should the ECM, PIM or ICU be replaced, the modules must be security linked to
each other. If this linking procedure is not performed, the vehicle will not crank nor run. For additional
information relating to Tech 2 and the linking procedure, refer to 11A – Immobiliser.
NOTE
After an ECU reset, the ignition switch must be
turned Off for at least 10 seconds and then
turned On for at least one minute, before
attempting communication between Tech 2 and
the ECU.
Preconditions: TIS approval (TIS 2000 Security Access) must be obtained, the four digit security number
entered into Tech 2 and the theft deterrent system disarmed. Then the ignition must be turned ‘On’, using a
programmed remote coded key.
F1: Reset ECU : This function erases the security link between the Engine Control Module (ECM) and the
Powertrain Interface Modules (PIM). If this procedure is performed, the engine will not crank nor run. A ICU
Link to ECM/PIM procedure will need to be performed. For additional information relating to the ICU Link to
ECM/PIM procedure, refer to 11A – Immobiliser.

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Engine Management – V6 – Diagnostics Page 6C1-2–246

NOTE
After an ECU reset, the ignition switch must be
turned Off for at least 10 seconds and then
turned On for at least one minute, before
attempting communication between Tech 2 and
the ECU.
Preconditions: The four digit security code must be entered into Tech 2 and the theft deterrent system
must be disarmed and the ignition switched ‘On’ with a programmed remote coded key.
F2: Fuel Trim Reset : This function resets the fuel trim data values learned by the ECM.
F3: Throttle Body Relearn : In this mode, Tech 2 commands the throttle plate from its rest position to full closed
then to about 10% open. This procedure takes approximately 6 – 8 seconds. At the start of this procedure,
the Tech 2, ‘Electronic Throttle Control Learn Counter’ parameter should display ‘0’ then count up to 11, after
the procedure is completed. If the counter does not start at ‘0’, nor display a count of ‘11’ at the conclusion of
the procedure, a fault has occurred and a DTC will set.


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Engine Management – V6 – Service Operations Page 6C1-3–4

1 General Information
1.1 General Description
This Section describes the correct service procedures to repair and test components of the V6 engine management
system. Emphasis is placed on the proper procedures and repair of components related to this specific system.
For component description, operation and location, refer to 6C1-1 Engine Management – V6 – General Information.
Engine cylinder identification follows the international
standard OBD II. This standard calls for the engine cylinder
bank number one to be identified by the location of cylinder
number one. Therefore the numbering for the V6 engine is:
• 1, 3, 5 – Right-hand side (Bank 1).
• 2, 4, 6 – Left-hand side (Bank 2).
The engine firing order is 1, 2, 3, 4, 5, 6.
Figure 6C1-3 – 1
1.2 Service Precautions and Requirements
Service Precautions

The following safety and precautionary
directions must be followed when servicing
the engine management system otherwise
personal injury and / or improper system
operation may occur:
• If working on a vehicle which has been subjected to an under bonnet thermal incident (fire), wear appropriate
protective clothing to prevent personal injury. Components that contain fluoro-elastomer may produce a corrosive
bi-product when subjected to extreme heat.
• Disconnection of the battery affects certain vehicle electronic systems. Refer to the battery disconnection
procedure in 6D1-3 Battery – V6 before disconnecting the battery.
• Disconnect the battery negative lead when performing the following procedures:
• disconnecting the engine control module (ECM) connectors, or
• charging the battery.
• Disconnect the battery negative lead and the ECM connectors before attempting any electric welding on the vehicle.
• Do not start the engine if the battery terminal is not properly secured to the battery.
• Do not disconnect or reconnect the following while the ignition is switched on or when the engine is running:
• any engine management system component wiring connector, or
• battery terminal leads.

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Engine Management – V6 – Service Operations Page 6C1-3–6

Basic Diagnostic Tools Required

Use of incorrect electrical circuit diagnostic
tools when performing certain service
procedures could result in incorrect
diagnostic results or damage to components.
The following electrical circuit testing tools are required to perform the diagnostic procedures detailed in this Section:
• Test lamp, refer to 8A Electrical – Body and Chassis for further information.
• Digital multimeter with 10 M Ω ohms impedance, refer to 8A Electrical – Body and Chassis for further information.
• Connector test adapter kit Tool No. J35616-A.
1.3 Service Operations Not Covered In This
Section
There are situations where components and/or procedures related to the powertrain management system are covered in
other Sections of the service documentation. To aid technicians in locating the necessary service procedures for these
components and/or procedures, refer to the stated references.
Air-conditioning System
For A/C pressure switch replacement procedure, refer to 2A Heater and Air-conditioning.
Electrical Components
For the following electrical system component replacement procedures, refer to the appropriate Sections as follows:
• Extended brake pedal travel switch and stop lamp switch service operations, refer to 5C Brakes.
• Fuse and relay locations, refer to 8A Electrical-Body and Chassis.
• Cruise control switch assembly service operations, refer to 8C Cruise Control – HFV6.
• Powertrain interface module PIM removal and installation procedure, refer to 6E1 Powertrain Interface Module – V6.
• Neutral start and back-up lamp switch, refer to 7C4 Automatic Transmission – 4L60E – On-vehicle Servicing.
• Vehicle speed sensor service operations, refer to:
− 7C4 Automatic Transmission – 4L60E – On-vehicle Servicing
− 7B1 Manual Transmission – V6
Fuel System
For the following fuel system component replacement procedures, refer to 6C Fuel System – V6.
• Fuel system cleaning,
• Fuel system leak and pressure test,
• Fuel feed hose to fuel rail replacement,
• Fuel line quick connect fittings,
• Evaporative emission control canister,
• Fuel filter,
• Fuel hose / pipes layout,
• Fuel pump motor assembly and fuel pressure regulator assembly,
• Fuel sender assembly service operations.

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Engine Management – V6 – Service Operations Page 6C1-3–20

Reinstall
Reinstallation of the engine control module (ECM) is the reverse of the removal procedure, noting the following:
NOTE
During installation of the ECM, the
SICHTMUSTER ME 9.6 label (1) is positioned at
the top right-hand corner.
1 Reinstall ECM attaching bolts and tighten to the correct torque specification.
Engine control module attaching bolt
torque specification ...................................8.0 – 12.0 Nm
2 Reinstall the ground terminal screw and tighten to the correct torque specification.
Ground terminal attaching screw
torque specification ..............................................4.5 Nm
Figure 6C1-3 – 17
3 Reinstall the main vehicle wiring harness connector, and engine wiring harness connector, ensuring the connector locking lever is fully seated, refer to Figure 6C1-3 – 15.
4 If the ECM has been replaced, perform the following procedures:
• ECM service programming, 6E1 Powertrain Interface Module – V6.
• ECM / PIM / ICU security link, refer to 6E1 Powertrain Interface Module – V6.
• Main diagnostic table functional check, refer to 6C1-2 Engine Management – V6 – Diagnostics.
5 If the ECM has been removed, but not replaced, perform the main diagnostic table functional check, refer to 6C1-2 Engine Management – V6 – Diagnostics.
6 Start the vehicle and allow to idle.
ECM Reset

Do not perform the reset procedure within
sixty seconds of turning the ignition on.
Failure to comply may result in the ECM
failing to reset.
W hen an ECM is installed onto a vehicle, it is security linked to the Immobiliser Control Unit (ICU) and powertrain
interface module (PIM). Once this linking has been performed, the ECM cannot be installed in any other vehicle unless
the security linking between the ICU and the PIM has been reset using the following procedure.
NOTE
Prior to resetting the ECM, obtain the Security
Code. This information is found on the vehicle
security card issued with the vehicle when new.
For further information on the vehicle security
card, refer to 6E1 Powertrain Interface Module –
V6.
1 Connect Tech 2 to the data link connector (DLC) and turn the ignition on.
2 On Tech 2 select Engine / V6 Engine / Programming / Reset ECU .

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Engine Management – V6 – Service Operations Page 6C1-3–21

NOTE
When Tech 2 requests programming approval,
obtain TIS approval.
3 W hen Tech 2 displays Enter Security Code, enter the security code, press the Enter key and then the Okay soft
key.

The engine will not start after the ECM has
been reset.
4 W hen Tech 2 displays Do you really want to Reset? , press the Reset soft key.
5 W hen Tech 2 displays Stop Engine - Turn Off Ignition , turn the ignition off and press the Confirm soft key.
6 W hen Tech 2 displays Turn Ignition On, turn the ignition on and press the Confirm soft key.
7 W hen Tech 2 displays Reset Completed Successfully , press the Confirm soft key to return to the Tech 2
Programming screen.
2.8 Engine Control Module Bracket Assembly
Remove
1 Remove the engine control module (ECM), refer to 2.7 Engine Control Module.
2 Remove the bolt (1) and the two bolts (2), attaching the ECM bracket assembly (3) to the front engine
cover and remove.
Figure 6C1-3 – 18
Reinstall
Reinstallation of the engine control module (ECM) bracket assembly is the reverse of the removal procedure, noting the
following:
1 Tighten the ECM bracket assembly bolts to the correct torque specification.
Engine control module bracket
assembly attaching bolt
torque specification (6mm)........................7.5 – 10.5 Nm
Engine control module bracket
assembly attaching bolt
bolt torque specification (8mm) ...............19.0 – 25.0 Nm
2 Perform the main diagnostic table functional check, refer to 6C1-2 Engine Management – V6 – Diagnostics.

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Engine Management – V6 – Service Operations Page 6C1-3–42

4 Observe the resistance values as the temperature
increases and compare the temperature / resistance
change to the specifications.
5 If the resistance is not within specifications, replace the MAF sensor.
Intake Air Temperature Vs Resistance
Temperature °C Resistance – Ohms (
Ω)
-40 35140 – 43760
-20 12660 – 15120
-10 7943 – 9307
0 5119 – 5892
20 2290 – 2551
25 1900 – 2100
40 1096 – 1238
60 565 – 654
80 312 – 370
100 184 – 222
120 114 – 141
140 74 – 93
2.18 Knock Sensor, Bank 2 (LHS)
Remove
1 Turn the ignition switch off.
2 Disconnect Bank 2 pre-catalytic converter HO2S wiring harness connector, refer to 2.14 Heated Oxygen Sensor.
3 Raise the front of the vehicle and support on safety stands. Refer to 0A General Information for location of the jacking points.
4 Remove the starter motor heat shield, refer to 6D1-2 Starting System – V6.
5 Disconnect the wiring harness connector (1) from the knock sensor (2).
Figure 6C1-3 – 56

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Engine Management – V6 – Service Operations Page 6C1-3–46

2 Disconnect the wiring harness connector (1) from the
MAF sensor.
3 Remove the air intake duct, refer to 2.16 Intake Air Duct Assembly.

Figure 6C1-3 – 63
5 Remove the nut (1), two places, attaching the MAF sensor (2) to the upper air cleaner housing (3).
6 Position the flexible air intake duct away from the MAF sensor and remove the MAF sensor.
NOTE
The MAF sensor seal (4) is part of the air cleaner
upper housing and is not serviced as a separate
item.
Figure 6C1-3 – 64
Reinstall
Reinstallation of the mass air flow (MAF) sensor is the reverse of the removal procedure, noting the following:

Care must be taken not to over tighten the
MAF sensor attaching nuts. Over tightening
the nuts may cause damage to the MAF
sensor seal and allow unfiltered air to enter
the air intake system.
1 Tighten the MAF sensor nuts to the correct torque specification. Mass air flow sensor attaching nut
torque specification .....................................1.8 – 2.2 Nm
2 Tighten the air intake duct retaining clamp screw to the correct torque specification. Air intake duct retaining clamp
torque specification .....................................1.8 – 2.5 Nm
3 Start the engine and check for any air leaks between the air intake duct, the MAF and the upper air cleaner housing.
4 Road test the vehicle and check for correct operation, taking particular note that no air leaks are evident.

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