Content .. 877 878 879 880 ..

Isuzu KB P190. Manual - part 879

Engine Management – V6 – Diagnostics

Page 6C1-2–238

B2 Average Injection Time (Bank 2)

0.0

1.9

Mass Air Flow Sensor

1.0

1.1

Mass Air Flow

g/s

0.00

2.92

Power Enrichment

No / Yes

Spark Advance

°CA

Calculated Throttle Position

Vehicle

Speed

km/h 0 0

Volumetric Efficiency

(1)

Automatic Transmission Only

(2)

Manual Transmission Only

8.4

Tech 2 Data Definitions

N O T E

This listing is arranged in alphabetical order and
defines each parameter shown in the Data Lists.

A/C Cutoff Mode (Air Conditioning): This parameter displays whether the control module is commanding the A/C
compressor clutch relay OFF for a number of reasons, among which is; operating pressure outside given parameters or
throttle position at wide open throttle (WOT).

A/C Disengagement 1 – 8 History: The parameter displays the last 8 air conditioning (A/C) compressor disengages in
order from 1 to 8 with 8 being the most recent. There are 8 possible causes listed for the A/C compressor to disengage;
High Pressure, Engine Speed, Battery Voltage, Stall Prevention, Full Load, Performance, Engine Temperature or Signal
not Present. Any of these causes need to be outside calibrated values, to cause the A/C to disengage.

A/C Pressure Sensor (Air Conditioning): This parameter displays the voltage from the A/C high side pressure sensor
signal circuit to the control module.

A/C Pressure Sensor (Air Conditioning): This parameter displays the pressure in kPa from the A/C high side pressure
sensor signal circuit to the control module.

A/C Relay (Air Conditioning): This parameter displays the state of the A/C clutch relay control circuit, either as ‘ON’ or
‘OFF’.

A/C Relay Status: This parameter displays the state of the A/C request input to the control module from the heating,
ventilation, and air conditioning (HVAC) controls.

A/C Request: Represents the commanded state of the A/C clutch control relay. Clutch should be engaged when ON is
displayed.

Actual Gear: This parameter displays the transmission range input to the control module, determined directly from the
decoding of the PRNDL – A, B, C, and P inputs from the transmission internal mode switch (IMS).

Actual Gear: Based on the evaluation of the PRNDL – A, B, C, and P inputs, the ECM determines whether the
parameter is valid or invalid.

Actual Intake Camshaft Position (Bank 1 or Bank 2): This parameter displays the actual intake camshaft position in
degrees of crankshaft angle.

Alternator L Terminal Duty Cycle: This parameter displays the ECM commanded state of the voltage regulator on the
alternator, expressed as a percentage from 0 to 100.

APP Sensor 1 (Accelerator Pedal Position): This parameter displays the actual voltage on the APP sensor 1 signal
circuit as measured by the ECM, that can range from 0.9 – 4.5 volts.

APP Sensor 2 (Accelerator Pedal Position): This parameter displays the actual voltage on the APP sensor 1 signal
circuit as measured by the ECM, that can range from 0.45 – 2.25 volts.

APP Sensor 1 and 2 Correlation (Accelerator Pedal Position): This parameter displays ‘Okay’ under normal
operating conditions or ‘Fault’ if the control module detects the signal voltage from APP sensor 1 that is not in the
correct relationship to APP sensor 2.

Average Injection Time (Bank 1 or Bank 2): This parameter displays the average pulse width of the fuel injectors for
each bank of the engine as determined by the ECM.

Engine Management – V6 – Diagnostics

Page 6C1-2–239

B1/B2 S1 O2 Sensor 1 (Bank 1 or Bank 2 Sensor 1): This parameter displays the lambda output from the HO2S to the
ECM. A lambda below 1.0 indicates a rich exhaust, while a lambda above 1.0 indicates a lean exhaust.

B1/B2 S2 O2 Sensor 2 (Bank 1 or Bank 2 Sensor 2): This parameter displays the mV output from the HO2S to the
ECM. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust.

B1/B2 S1 O2 Sensor Heater (Bank 1 or Bank 2 Sensor 1): This parameter displays the resistance of the sensing
element within the ECM. The front sensors are normally regulated to 80 ohms.

B1/B2 S1/S2 O2 Sensor Heater Circuit Status (Bank 1 or Bank 2 Sensor 1 or Sensor 2): The parameter displays
‘Fault’ if the oxygen sensor heater control circuit is open, shorted to ground, or shorted to voltage. The parameter
displays ‘Undefined’ until the circuit has been commanded ON.

Barometric Pressure: This parameter displays the barometric pressure in kPa. The ECM uses the barometric pressure
for fuel control to compensate for altitude differences.

Barometric Pressure: This parameter displays the barometric pressure voltage. The control module uses the
barometric pressure for fuel control to compensate for altitude differences.

Brake Lamp Switch: This parameter displays the status of the brake lamp switch. When the brake pedal is pressed the
switch contacts close causing the vehicles brake lamps to illuminate.

Brake Switch Signal Status: This parameter displays the position of the torque converter clutch (TCC) brake pedal
switch input to the ECM.

Calculated ECT – Closed Loop Fuel Control (Engine Coolant Temperature): This parameter displays the modelled
temperature that the control module calculates from air entering the engine, coolant temperature, and ambient air
temperature. If the actual engine coolant temperature does not reach this calculated temperature within a predetermined
amount of time, a DTC will set.

Calculated ECT – Thermostat Diagnosis (Engine Coolant Temperature): This parameter displays the modelled
temperature that the control module calculates from air entering the engine, coolant temperature, and ambient air
temperature. If the actual engine coolant temperature does not reach this calculated temperature within a predetermined
amount of time, a DTC will set.

Calculated Pedal Position: This parameter displays the angle of the accelerator pedal position (APP) as calculated by
the ECM, using the signals from the APP sensors, as a percentage of throttle opening.

Calculated Throttle Position: This parameter displays the percentage of throttle opening, based on the two TP sensor
inputs to the ECM.

Catalyst Protection Mode: This parameter displays if the control module is commanding catalytic converter protection
or not.

Catalyst Temperature (Bank 1 or Bank 2): This parameter displays the catalytic converter temperature as calculated
by the control module.

Clutch Pedal Switch: This parameter displays the state of the clutch pedal as determined by the ECM from the clutch
start switch position.

Clutch Pedal Switch: This parameter displays the state of the clutch pedal as determined by the ECM from the clutch
pedal switch.

Commanded Exhaust Camshaft Position (Bank 1 or Bank 2): This parameter displays the exhaust camshaft position
in percent of range as commanded by the control module.

Commanded Exhaust Camshaft Position (Bank 1 or Bank 2): This parameter displays the exhaust camshaft position
in crankshaft degrees, as commanded by the ECM.

Commanded Intake Camshaft Position (Bank 1 or Bank 2): This parameter displays the intake camshaft position in
crankshaft degrees, as commanded by the ECM.

Commanded B1/B2 S1 O2 Sensor Heater (Bank 1 or Bank 2 Sensor 1): This parameter displays the state of the
oxygen sensor heater control circuit, as a percentage.

Commanded B1/B2 S1 O2 Sensor Value (Bank 1 or Bank 2 Sensor 1): This parameter displays the lambda output
from the HO2S to the ECM. A lambda below 1.0 indicates a rich exhaust, while a lambda above 1.0 indicates a lean
exhaust.

Coolant Temperature: This parameter displays the temperature of the engine coolant based on input to the control
module from the engine coolant temperature (ECT) sensor.

Crank Request: This parameter displays whether the ignition switch has been cycled to the crank position, requesting
the ECM to activate the starter relay.

Cruise Control Active: This parameter displays the status of the cruise control system as determined by the ECM.

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: When 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.

Engine Management – V6 – Diagnostics

Page 6C1-2–241

Cooling Fan Relay Circuit Status: This parameter displays the state of the fan relay control circuit. The parameter
displays ‘Fault’ if the fan relay control circuit is open, shorted to ground, or shorted to voltage. The parameter displays
‘Undefined’ until the relay control circuit has been determined as being ‘OK’.

Fuel Level: This parameter displays the amount of fuel in the fuel tank in litres, as calculated by the ECM from data
received from the fuel level sensor.

Fuel Level Sensor: This parameter displays the voltage received from the fuel level sensor in the fuel tank, by the ECM.

Fuel Pump Relay Circuit Status: This parameter displays the state of the fuel pump relay control circuit. The
parameter displays ‘Fault’ if the fuel pump relay control circuit is open, shorted to ground, or shorted to voltage. The
parameter displays ‘Undefined’ until the relay control circuit has been determined as being ‘OK’.

Fuel Pump Relay: This parameter displays the ECM commanded state of the fuel pump relay control circuit.

Fuel Trim Learn: This parameter displays ‘Enabled’ when conditions are appropriate for enabling long term fuel trim
corrections. This indicates that the long term fuel trim is adapting continuing amounts of short term fuel trim. If Tech 2
displays ‘Disabled’, then long term fuel trim will not respond to changes in short term fuel trim.

Ignition Accessory Signal: This parameter displays ‘On’ when the control module detects a voltage at the
ignition ‘ACC’ terminal, X1-4 of the ignition switch.

Ignition On Signal: This parameter displays ‘On’ when the control module detects a voltage at the ignition ‘IGN’
terminal X1-3 of the ignition switch.

Initial Brake Apply Signal: This parameter displays the status of the brake lamp switch. Before the cruise control can
be activated, this switch contact must be open circuit when the brake pedal is pressed.

Injection Time Cylinder 1 – 6: This parameter displays the amount of fuel injector On-time or pulse width as
commanded by the ECM.

Intake Air Temperature: This parameter displays the temperature of the air entering the air induction system based on
input to the ECM from the intake air temperature (IAT) sensor.

Knock Sensor Signal (Bank 1 or Bank 2): This parameters displays the voltage input to the control module from the
knock sensor (KS).

Knock Retard: This parameter indicates the amount of spark advance in crankshaft degrees, that the ECM removes
from the ignition control (IC) spark advance in response to the signal from the knock sensors.

Knock Retard Cylinder 1 – 6: This parameter displays the knock retard as commanded by the ECM for cylinders 1-6.
Each cylinder is controlled individually based on both knock sensor signal inputs.

Loop Status B1S1 / B2S1 (Bank 1 or Bank 2 Sensor 1): This parameter displays the state of the fuel control system
as commanded by the ECM. ‘Closed’ Loop operation indicates that the ECM is controlling the fuel delivery based on the
oxygen sensors input signal. In ‘Open’ Loop operation the ECM ignores the oxygen sensor input signal and bases the
amount of fuel to be delivered on other sensor inputs.

LTFT Idle/Deceleration (Bank 1 or Bank 2) (Long Term Fuel Trim): This parameter displays the commanded Long
Term Fuel Trim correction by the ECM for bank 1 or bank 2 for idle and deceleration conditions.

LTFT Cruise/Acceleration (Bank 1 or Bank 2) (Long Term Fuel Trim): This parameter displays the commanded Long
Term Fuel Trim correction by the ECM for bank 1 or bank 2 for cruise and acceleration conditions.

Malfunction Indicator (MI): This parameter displays the commanded (‘On, ‘Off’ or ‘Flashing’) state of the malfunction
indicator lamp (MIL) control circuit by the ECM.

Malfunction Indicator (MI) Circuit Status: This parameter displays the state of the MIL control circuit. The parameter
displays ‘Fault’ if the MIL control circuit is open, shorted to ground, or shorted to voltage. This parameter displays
‘Undefined Status’ until the circuit has been determined as being ‘OK’.

Mass Air Flow: This parameter displays the measured quantity (g/s) of air flowing into the engine during all operating
conditions.

Mass Air Flow Sensor: This parameter displays the signal voltage from the mass air flow (MAF) sensor to the ECM.

Misfire Current Cyl. #1 – #6: Tech 2 displays a range of 0 – 200 counts. This parameter displays the number of
misfires that have been detected during the last 200 cylinder firing events. The counters may normally display some
activity, but the activity should be nearly equal for all of the cylinders, and in low numbers.

Misfire History Cyl. #1 – #6: Tech 2 displays a range of 0 – 65,535 counts. The misfire history counters display the total
level of misfire that has been detected on each cylinder. The misfire history counters will not update or show any activity
until a misfire DTC P0300 has become active. The misfire history counters will update every 200 cylinder firing events.

Oil Level: When the ECM receives information from the engine oil level switch, where the engine oil level is within
preset parameters, Tech 2 will display ‘Normal’. If not within preset parameters, the display will show ‘Low’.

Content .. 877 878 879 880 ..