2007 ISUZU KB P190 language

6E–68 ENGINE DRIVEABILITY AND EMISSIONS
On-Board Diagnostic (OBD)
On-Board Diagnostic Tests
A diagnostic test is a series of steps, the result of which
is a pass or fail reported to the diagnostic executive.
When a diagnostic test reports a pass result, the
diagnostic executive records the following data:
• The diagnostic test has been completed since the last ignition cycle.
• The diagnostic test has passed during the current ignition cycle.
• The fault identified by the diagnostic test is not currently active.
When a diagnostic test reports a fail result, the
diagnostic executive records the following data:
• The diagnostic test has been completed since the last ignition cycle.
• The fault identified by the diagnostic test is currently active.
• The fault has been active during this ignition cycle.
• The operating conditions at the time of the failure.
The Diagnostic Executive
The Diagnostic Executive is a unique segment of
software which is designed to coordinate and prioritize
the diagnostic procedures as well as define the protocol
for recording and displaying their results. The main
responsibilities of the Diagnostic Executive are listed as
follows:
• Commanding the check engine lamp on and off
• DTC logging and clearing
• Current status information on each diagnostic
Diagnostic Information
The diagnostic charts and functional checks are
designed to locate a faulty circuit or component through
a process of logical decisions. The charts are prepared
with the requirement that the vehicle functioned
correctly at the time of assembly and that there are not
multiple faults present.
There is a continuous self-diagnosis on certain control
functions. This diagnostic capability is complemented
by the diagnostic procedures contained in this manual.
The language of communicating the source of the
malfunction is a system of diagnostic trouble codes.
When a malfunction is detected by the control module, a
diagnostic trouble code is set and the check engine
lamp is illuminated.
Check Engine Lamp
The check engine lamp looks the same as the check
engine lamp you are already familiar with, the “Check
Engine” lamp.
Basically, the check engine lamp is turned on when the
ECM detects a DTC that will impact the vehicle
emissions.
• When the check engine lamp remains “ON” while the engine is running, or when a malfunction is suspected due to a driveability or emissions problem,
a Powertrain On-Board Diagnostic (OBD) System
Check must be performed. The procedures for these
checks are given in On-Board Diagnostic (OBD)
System Check. These checks will expose faults
which may not be detected if other diagnostics are
performed first.
Data Link Connector (DLC)
The provision for communication with the contorl
module is the Data Link Connector (DLC). It is located
behind the lower front instrument panel. The DLC is
used to connect to a Tech 2. Some common uses of the
Tech 2 are listed below:
• Identifying stored Diagnostic Trouble Codes (DTCs).
• Clearing DTCs.
• Reading serial data.
Verifying Vehicle Repair
Verification of vehicle repair will be more
comprehensive for vehicles with OBD system
diagnostic. Following a repair, the technician should
perform the following steps:
1. Review and record the Fail Records for the DTC which has been diagnosed.
2. Clear DTC(s).
3. Operate the vehicle within conditions noted in the Fail Records.
4. Monitor the DTC status information for the specific DTC which has been diagnosed until the diagnostic
test associated with that DTC runs.
Following these steps is very important in verifying
repairs on OBD systems. Failure to follow these steps
could result in unnecessary repairs.

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–31

9 DTC Tables
9.1 DTC C0550 – PIM Internal Fault
DTC Description
This diagnostic procedure supports the following DTCs:
• DTC C0550 – EEPROM Error.
• DTC C0550 – Internal Control Module Read Only Memory (ROM Error).
• DTC C0550 – Internal Control Module Random Access Memory (RAM) Error.
Circuit Description
The powertrain interface module (PIM) is the control centre for the communication language conversion between GM
LAN serial data and keyword 2000 serial data. If there is an internal microprocessor integrity fault condition with the PIM,
DTC C0550 will set.
Additional Information
• Refer to 6 W iring Diagram and Connector Chart for the following information:
• PIM connector illustration and terminal assignment, and
• PIM wiring diagram.
• For intermittent fault conditions, refer to Intermittent Fault Conditions.
• Since fault conditions in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic
procedure for shorted terminals or poor wiring connection before replacing any component. Refer to 8A Electrical -
Body and Chassis for information on electrical fault diagnosis.
Conditions for Running the DTC
• Conditions for running the DTC are:
• The ignition is switched on.
• The ignition voltage is 10.0 – 16.0 V.
Conditions for Setting the DTC
An internal PIM fault exists.
Action Taken When the DTC Sets
The action taken when any of these DTCs set will depend on the severity of the error. This may vary from no visual or
audible warnings to a Malfunction Indicator Lamp and / or Service Vehicle Soon warning lamp displayed on the
instrument cluster.
Conditions for Clearing the DTC
Refer to 4.1 Diagnostic General Descriptions for information on the conditions for clearing DTCs.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 This step checks if the DTC is current, and if so, indicates the PIM has an internal problem.
3 This step checks the PIM ground and 12 V battery supply.

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ISUZU KB P190 2007

Automatic Transmission – 4L60E – General Information Page 7C1–11
4 Transmission Definitions and
Abbreviations
The following definitions and abbreviations are provided to establish a common language and assist the user in
describing transmission related conditions. The use of these terms and/or conditions can be found in the various parts of
the automatic transmission sections, but more particularly in 7C3 Automatic Transmission – 4L60E – Hydraulic and
Mechanical Diagnosis.
4.1 Throttle Position Related Definitions
Throttle Position Definition
Minimum Throttle The least amount of throttle opening required for an upshift.
Light Throttle Approximately 1/4 of accelerator pedal travel (25% Throttle Position).
Medium Throttle Approximately 1/2 of accelerator pedal travel (50% Throttle Position).
Heavy Throttle Approximately 3/4 of accelerator pedal travel (75% Throttle Position).
Wide Open Throttle (WOT) Full travel of the accelerator pedal (100% Throttle Position).
Full Throttle Detent Downshift A quick apply of the accelerator pedal to its full travel, forcing a downshift.
Zero Throttle Coast Down A full release of the accelerator pedal while the car is in motion and in drive range.
Engine Braking A condition where the engine is used to slow the car by manually downshifting
during a zero throttle coast down.
4.2 Noise Condition Related Definitions
Noise Condition Definition
Planetary Gear Noise A whine related to car speed most noticeable in first gear or reverse. Becomes less
noticeable after an upshift.
Pump Noise A high pitch whine increasing with engine r.p.m.
4.3 General Definitions
General Definition
Accumulator A component of the transmission that absorbs hydraulic pressure during the apply of a
clutch or band. Accumulators are designed to control the quality of a shift from one gear range to another.
Adaptive Learning Programming within the TCM that automatically adjusts hydraulic pressures in order to compensate for changes in the transmission (i.e. component wear).
Applied An 'Applied Component' is holding another component to which it is splined or
assembled to. Also referred to as "engaged".
Apply Components Hydraulically operated clutches, servo’s, bands and mechanical one-way roller or
sprag clutches that drive or hold members of a planetary gear set.
Apply Plate A steel clutch plate in a clutch pack, located next to the (apply) piston.
Backing Plate A steel plate in a clutch pack that is usually the last plate in that clutch assembly
(furthest from the clutch piston).
Band An apply component that consists of a flexible strip of steel and friction material that
wraps around a drum. When applied, it tightens around the drum and prevents the drum from rotating.
Brake Switch An electrical device that provides signals to the transmission control module (TCM),
based on the position of the brake pedal. The TCM uses this information to apply or
release the torque converter clutch (TCC).
Centrifugal Force A force that is imparted on an object (due to rotation) that increases as that object moves further away from a centre-point of rotation.

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