2007 ISUZU KB P190 coolant temperature

Engine Management – V6 – Diagnostics Page 6C1-2–194

8 Using Tech 2, clear the DTCs.
2 Switch off the ignition for 30 seconds.
3 Start the engine.
4 Operate the vehicle within the conditions for running the DTC.
Did DTC P2179 or P2189 fail this ignition cycle? —
Go to Step 2 Go to Step 9
9 1 Using Tech 2, select the DTC display function.
Does Tech 2 display any DTCs? —
Go to the
appropriate DTC Table in this Section System OK
7.54 DTC P2188 or P2190
DTC Descriptors
This diagnostic procedure supports the following DTCs:
• DTC P2188 Fuel Trim System Rich at Idle Bank 1
• DTC P2190 Fuel Trim System Rich at Idle Bank 2
Circuit Description
The engine control module (ECM) controls the air / fuel metering system to provide the best possible combination of
driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open and Closed Loop.
During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S)
input. During Closed Loop, the HO2S inputs are added and used by the ECM to calculate short and long term fuel trim
fuel delivery adjustments. If the HO2S indicate a lean condition, fuel trim values will be above 0 percent. If the O2S
indicate a rich condition, fuel trim values will be below 0 percent. Short term fuel trim values change rapidly in response
to the HO2S signals. Long term fuel trim makes coarse adjustments to maintain an air / fuel ratio of 14.7:1. If the ECM
detects an excessively rich condition, this DTC sets.
Conditions for Running the DTC
• Before the ECM can report DTC P2188 or P2190 failed, DTCs P0101, P0121, P0122, P0123, P0133, P0153,
P0221, P0222, P0223, P0336, P0338, P0443, P0458, P0459, P0461, P0462, P0463, P2066, P2067, and P2068
must run and pass.
• The fuel system is in Closed Loop.
• The long fuel trim is active.
• The engine coolant temperature (ECT) is more than 60°C (140°F).
• The evaporative emission (EVAP) canister purge solenoid valve is not enabled.
• The intake air temperature (IAT) is less than 60°C (140°F).
• The fuel level is more than 11.6 percent.
• The amount of air flow into the engine is more than 7 000 grams.
• DTC P2188 and P2190 runs continuously once the above conditions are met for at least 300 seconds
Conditions for Setting the DTC
• The Total Fuel Trim Avg. is less than –40 percent.
• The LT FT Idle / Decel is less than -7 percent.
• The condition exists for 4 seconds.

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ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–226

8.3 HFV6 Engine Data Lists
Engine Data 1
Tech 2 Display Units Displayed Ignition On Engine Running
Engine Speed RPM 0 1077
Desired Engine Idle Speed RPM 830 1090
Coolant Temperature °C 21 27
Intake Air Temperature °C 31 24
Mass Air Flow g/s 0.00 7.28
Engine Load % 100 30
Volumetric Efficiency % 99 23
Calculated Pedal Position % 0 0
Desired Throttle Position % 4 4
Calculated Throttle Position % 6 4
Barometric Pressure kPa 100 100
Barometric Pressure V 4.78 4.78
Loop Status B1S1 (Bank 1 Sensor 1) Open / Closed Open Closed
Loop Status B2S1 (Bank 2 Sensor 1) Open / Closed Open Closed
B1S1 O2 Sensor (Bank 1 Sensor 1) :1 (= Lambda) 1.0 1.0
B1S2 O2 Sensor (Bank 1 Sensor 2) mV 442 460
B2S1 O2 Sensor (Bank 2 Sensor 1) :1 (= Lambda) 1.0 1.0
B2S2 O2 Sensor (Bank 2 Sensor 2) mV 442 477
B1 Short Term Fuel Trim (Bank 1) % 0 -1
B1 LTFT Idle/Deceleration (Bank 1 Long Term Fuel
Trim) % 0 0
B1 LTFT Cruise/Acceleration (Bank 1 Long Term Fuel
Trim) % 0 0
B2 Short Term Fuel Trim (Bank 2)
% 0 –1
B2 LTFT Idle/Deceleration (Bank 2 Long Term Fuel
Trim) % 0 0
B2 LTFT Cruise/Acceleration (Bank 2 Long Term Fuel
Trim) % 0 0
(2) Transmission Gear
P-N / In Gear P-N P-N
EVAP Purge Solenoid (Evaporative Emission)
% 0 0
Fuel Level L 21 20
Spark Advance °CA 0 9
B1 Knock Sensor Signal (Bank 1) V 3.6 0.3
B2 Knock Sensor Signal (Bank 2) V 3.6 0.3
Knock Retard °CA 0 0
Knock Retard Cylinder 1 °CA 0 0
Knock Retard Cylinder 2 °CA 0 0

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ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–227

Knock Retard Cylinder 3 °CA 0 0
Knock Retard Cylinder 4 °CA 0 0
Knock Retard Cylinder 5 °CA 0 0
Knock Retard Cylinder 6 °CA 0 0
Ignition Accessory Signal Off / On On On
Ignition On Signal Off / On On On
Malfunction Indicator (MI) Off / On / Flashing On Off
Fuel Pump Relay Off / On Off On
Engine Control Ignition Relay Off / On On On
Engine Control Ignition Relay Feedback V 11.5 14.1
(1) Actual Gear -1- / -2- / -3- / -4- / -
5- / -P/N- / -R- / -Invalid- -P/N- -P/N-
Brake Lamp Switch
Inactive / Active Inactive Inactive
Reduced Engine Power Inactive / Active Inactive Inactive
DTC Set This Ignition No DTC / DTC Set No DTC No DTC
Vehicle Speed km/h 0 0
Engine Runtime h:m:s 00:00:00 00:05:20
(2) Clutch Pedal Switch Inactive / Active Inactive Inactive
(1) Automatic Transmission Only (2) Manual Transmission Only
Engine Data 2
Tech 2 Display
Units Displayed Ignition On Engine Running
Engine Speed RPM 0 751
Desired Engine Idle Speed RPM 830 750
Coolant Temperature °C 21 78
Cooling Fan On/Off Off On
Calculated ECT – Closed Loop Fuel Control (Engine
Coolant Temperature) °C 21 37
Calculated ECT – Thermostat Diagnosis (Engine
Coolant Temperature) °C 22 78
Intake Air Temperature
°C 31 27
Start Up ECT (Engine Coolant Temperature) °C 21 21
Start Up IAT (Intake Air Temperature) °C –48 30
Mass Air Flow Sensor V 1.00 1.3
Mass Air Flow g/s 0.00 5.47
Engine Load % 100 25
Volumetric Efficiency % 99 19
Power Enrichment No / Yes No No
Dec. Fuel Cutoff (Deceleration) Inactive / Active Inactive Inactive
Calculated Pedal Position % 0 0

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ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–229


EVAP Data
Tech 2 Display Units Displayed Ignition On Engine Running
EVAP Purge Solenoid (Evaporative Emission) % 0 31
Fuel Level L 21 20
Fuel Level Sensor V 1.24 1.25
Time Since Engine Off h:m:s 00:00:01 00:00:01
Engine Speed RPM 0 748
Desired Engine Idle Speed RPM 830 750
Coolant Temperature
°C 21 91
Start Up ECT (Engine Coolant Temperature)
°C 21 21
Start Up IAT (Intake Air Temperature)
°C –48 30
Intake Air Temperature
°C 31 30
Mass Air Flow Sensor
V 1.0 1.3
Engine Load % 100 23
Volumetric Efficiency % 99 18
Calculated Pedal Position % 0 0
Desired Throttle Position % 4 2
Calculated Throttle Position % 6 2
Barometric Pressure kPa 100 100
Loop Status B1S1 (Bank 1 Sensor 1) Open / Closed Open Closed
Loop Status B2S1 (Bank 2 Sensor 1) Open / Closed Open Closed
B1S1 O2 Sensor (Bank 1 Sensor 1) :1 (=Lambda) 1.0 23
B2S1 O2 Sensor (Bank 2 Sensor 1) :1 (=Lambda) 1.0 16
B1 Short Term Fuel Trim (Bank 1) % 0 –2
B1 LTFT Idle/Deceleration (Bank 1 Long Term Fuel
Trim) % 0 0
B1 LTFT Cruise/Acceleration (Bank 1 Long Term Fuel
Trim) % 0 0
B1 Total Fuel Trim (Bank 1)
% 0 -4
B2 Short Term Fuel Trim (Bank 2) % 0 0
B2 LTFT Idle/Deceleration (Bank 2 Long Term Fuel
Trim) % 0 0
B2 LTFT Cruise/Acceleration (Bank 2 Long Term Fuel
Trim) % 0 0
B2 Total Fuel Trim (Bank 2)
% 0 1
Fuel Trim Learn Disabled / Enabled Disabled Disabled
Ignition Accessory Signal Off / On On On
Ignition On Signal Off / On On On
DTC Set This Ignition No DTC / DTC Set No DTC No DTC

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ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–231

Engine Speed RPM 0 592
Coolant Temperature
°C 39 91
Intake Air Temperature
°C 32 26
Start Up ECT (Engine Coolant Temperature)
°C 39 34
Start Up IAT (Intake Air Temperature)
°C –48 30
Mass Air Flow Sensor
V 1.0 1.2
Engine Load % 100 22
Volumetric Efficiency % 99 15
Calculated Pedal Position % 0 0
Calculated Throttle Position % 5 1
Barometric Pressure kPa 102 102
Barometric Pressure V 4.88 4.88
Spark Advance
°CA 0 12
Ignition On Signal
Off / On On On
(1) Actual Gear -1- / -2- / -3- / -4- / -
5- / -P/N- / -R- / -Invalid- -P/N- -P/N-
DTC Set This Ignition
No DTC / DTC Set No DTC No DTC
Vehicle Speed km/h 0 0
Engine Runtime h:m:s 00:00:00 00:12:30
Ignition Accessory Signal Off / On On On
Mass Air Flow g/s 0.00 3.33
(1) Automatic Transmission Only (2) Manual Transmission Only
O2 Sensor Data
Tech 2 Display Units Displayed Ignition On Engine Running
Loop Status B1S1 (Bank 1 Sensor 1) Open / Closed Open Closed
Loop Status B2S1 (Bank 2 Sensor 1) Open / Closed Open Closed
Commanded B1S1 O2 Sensor Value (Bank 1 Sensor 1) :1 (= Lambda) 0.99 0.94
Commanded B2S1 O2 Sensor Value (Bank 2 Sensor 1) :1 (= Lambda) 0.99 0.94
B1S1 O2 Sensor (Bank 1 Sensor 1) :1 (= Lambda) 0.99 0.94
B1S2 O2 Sensor (Bank 1 Sensor 2) mV 438 538
B2S1 O2 Sensor (Bank 2 Sensor 1) :1 (= Lambda) 0.99 0.99
B2S2 O2 Sensor (Bank 2 Sensor 2) mV 438 486
B1S1 O2 Sensor Heater (Bank 1 Sensor 1) Ohm 540 80
B2S1 O2 Sensor Heater (Bank 2 Sensor 1) Ohm 540 80
Commanded B1S1 O2 Sensor Heater (Bank 1 Sensor 1) % 0.0 42.0
Commanded B2S1 O2 Sensor Heater (Bank 2 Sensor 1) % 0.0 42.0
B1 Short Term Fuel Trim (Bank 1) % 0 –1
B1 LTFT Idle/Deceleration (Bank 1 Long Term Fuel
Trim) % 0 1

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ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–232

B1 LTFT Cruise/Acceleration (Bank 1 Long Term Fuel
Trim) % 0 0
B1 Total Fuel Trim (Bank 1)
% 0 4
B2 Short Term Fuel Trim (Bank 2) % 0 0
B2 LTFT Idle/Deceleration (Bank 2 Long Term Fuel
Trim) % 0 1
B2 LTFT Cruise/Acceleration (Bank 2 Long Term Fuel
Trim) % 0 0
B2 Total Fuel Trim (Bank 2)
% 0 4
Fuel Trim Learn Disabled / Enabled Disabled Disabled
Power Enrichment No / Yes No No
Dec. Fuel Cutoff (Deceleration) Inactive / Active Inactive Inactive
Engine Speed RPM 0 600
Coolant Temperature °C 39 93
Intake Air Temperature °C 32 28
Start Up ECT (Engine Coolant Temperature) °C 39 34
Start Up IAT (Intake Air Temperature) °C –48 30
Mass Air Flow Sensor V 1.0 1.1
Mass Air Flow g/s 0.00 3.17
Engine Load % 100 20
Volumetric Efficiency % 99 14
Calculated Pedal Position % 0 0
Calculated Throttle Position % 5 1
Barometric Pressure kPa 102 102
Barometric Pressure V 4.88 4.88
Spark Advance °CA 0 12
DTC Set This Ignition No DTC / DTC Set No DTC No DTC
Vehicle Speed km/h 0 0
Engine Runtime h:m:s 00:00:00 00:14:40
(1) Automatic Transmission Only (2) Manual Transmission Only
TAC Data (Throttle Actuator Control)
Tech 2 Display Units Displayed Ignition On Engine Running
Reduced Engine Power Inactive / Active Inactive Inactive
Calculated Pedal Position % 0 0
Desired Throttle Position % 4 1
Calculated Throttle Position % 5 1
APP Sensor 1-2 Correlation (Accelerator Pedal Position
Sensor) Okay / Fault Okay Okay
TP Sensor 1-2 Correlation (Throttle Position)
Okay / Fault Okay Okay
APP Sensor 1 (Accelerator Pedal Position) V 1.02 1.02

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ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–233

APP Sensor 2 (Accelerator Pedal Position) V 0.47 0.47
TP Sensor 1 (Throttle Position) V 0.73 0.57
TP Sensor 2 (Throttle Position) V 4.27 4.43
TP Sensor 1 Learned Lower Position (Throttle Position) V 0.53 0.53
TP Sensor 2 Learned Lower Position (Throttle Position) V 4.49 4.49
Electronic Throttle Control Learn Counter Counts 11 11
Brake Lamp Switch Inactive / Active Inactive Inactive
Brake Switch Signal Status Valid / Invalid Valid Valid
Initial Brake Apply Signal Inactive / Active Inactive Inactive
Engine Speed RPM 0 598
Desired Engine Idle Speed RPM 680 600
Coolant Temperature
°C 38 96
Intake Air Temperature
°C 32 29
Mass Air Flow Sensor
V 1.0 1.1
Mass Air Flow g/s 0.00 3.11
Barometric Pressure kPa 102 102
Barometric Pressure V 4.88 4.88
Engine Load % 100 20
Volumetric Efficiency % 99 14
Ignition Accessory Signal Off / On On On
Ignition On Signal Off / On On On
Engine Control Ignition Relay Off / On On On
Engine Control Ignition Relay Feedback V 11.7 14.0
DTC Set This Ignition No DTC / DTC Set No DTC No DTC
Vehicle Speed km/h 0 0
Engine Runtime h:m:s 00:00:00 00:16:25
(1) Automatic Transmission Only (2) Manual Transmission Only
Cooling/HVAC Data
Tech 2 Display Units Displayed Ignition On Engine Running
Coolant Temperature
°C 37 100
Cooling Fan
Off / On Off Off
Intake Air Temperature
°C 32 30
A/C Request
No / Yes No No
A/C Relay (Air Conditioning) Off / On Off Off
A/C Pressure Sensor (Air Conditioning) V 1.0 1.5
A/C Pressure Sensor (Air Conditioning) kPa 732.55 1121.25
A/C Cutoff Mode (Air Conditioning) Inactive / Pressure /
Max. Acceleration / Active Inactive Inactive

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ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–234

A/C Disengagement 1st History Refer List Below High
Pressure Engine Speed
A/C Disengagement 2nd History
Refer List Below High
Pressure High Pressure
A/C Disengagement 3rd History
Refer List Below High
Pressure High Pressure
A/C Disengagement 4th History
Refer List Below High
Pressure High Pressure
A/C Disengagement 5th History
Refer List Below High
Pressure High Pressure
A/C Disengagement 6th History
Refer List Below High
Pressure High Pressure
A/C Disengagement 7th History
Refer List Below High
Pressure High Pressure
A/C Disengagement 8th History
Refer List Below High
Pressure High Pressure
Start Up ECT (Engine Coolant Temperature)
°C 37 34
Start Up IAT (Intake Air Temperature)
°C –48 30
Engine Load
% 100 19
Volumetric Efficiency % 99 13
Spark Advance °CA 0 13
Knock Retard °CA 0 0
Engine Speed RPM 0 601
Vehicle Speed km/h 0 0
Engine Runtime h:m:s 00:00:00 00:19:15
A/C Disengagement History Units
High Pressure / Engine Speed / Low Battery / Stall Prevention / Full Load / Performance / Engine Temp / Not Present
Cruise Control Data
Tech 2 Display Units Displayed Ignition On Engine Running
Cruise Control Switch Inactive / Active Inactive Inactive
Cruise Control Active No / Yes No No
Cruise Set / Decel Switch Inactive / Active Inactive Inactive
Cruise Resume/Acceleration Switch Inactive / Active Inactive Inactive
Cruise Control Disengagement Reason Refer List Below Brake Brake
CC Disengagement 1st History (Cruise Control) Refer List Below Brake Brake
CC Disengagement 2nd History (Cruise Control) Refer List Below Brake Brake
CC Disengagement 3rd History (Cruise Control) Refer List Below Brake Brake
CC Disengagement 4th History (Cruise Control) Refer List Below Brake Brake
CC Disengagement 5th History (Cruise Control) Refer List Below Brake Brake
CC Disengagement 6th History (Cruise Control) Refer List Below Brake Brake
CC Disengagement 7th History (Cruise Control) Refer List Below Brake Brake
CC Disengagement 8th History (Cruise Control) Refer List Below Brake Brake

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