Hombre S Regular Cab 2WD L4-2.2L CPC (1998)
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The Component Locations
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The Wiring Diagrams
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The Control Module Terminal End View and Terminal Definitions
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The OnBoard Diagnostic (OBD) System Check
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The Diagnostic Trouble Code Tables (DTCs) The Component System includes the following items:
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The Component and circuit description
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The On-vehicle service for each sub-system
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The Functional checks with the Diagnostic Tables
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How To Use Electrical Systems Diagnostic Information
The DTCs also contain the diagnostic support information containing the circuit diagrams, the circuit or the system information, and helpful
diagnostic information.
Maintenance Schedule
Refer to the General Motors Maintenance Schedule in Section OB of the appropriate service manual for the maintenance that the owner or
technician should perform in order to retain emission control performance.
Visual and Physical Underhood Inspection
Perform a careful visual and physical underhood inspection when performing any diagnostic procedure or diagnosing the cause of an emission test
failure.
This can often lead to repairing a problem without further steps. Use the following guidelines when performing a visual and physical inspection:
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Inspect all of the vacuum hoses for the following conditions: Correct routing
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Pinches
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Cuts
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Disconnects
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Inspect the hoses that are difficult to see beneath the air cleaner, the A/C compressor, the generator, etc.
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Inspect all of the wires in the engine compartment for the following items:
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Proper connections
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Burned or chafed spots
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Pinched wires
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Contact with sharp edges
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Contact with hot exhaust manifolds This visual and physical inspection is very important. Preform the inspection carefully and
thoroughly.
Basic Knowledge Of Tools Required
NOTICE: Lack of basic knowledge of this powertrain when performing diagnostic procedures could result in incorrect diagnostic performance or
damage to powertrain components. Do not attempt to diagnose a powertrain problem without this basic knowledge.
A basic understanding of hand tools is necessary in order to effectively use this information.
System Status and Drive Cycle For Satisfying the Federal Inspection/Maintenance (I/M 240) Regulations
The System Status selection is included in the scan tool System Info menu. Several states require that the I/M 240 (OBD II system) pass on-board
tests for the major diagnostics prior to having a vehicle emission inspection. This is also a requirement to renew license plates in some areas.
Using a scan tool, the technician can observe the System Status (complete or not complete) in order to verify that the vehicle meets the criteria
which complies with local area requirements. Using the System Status display, any of the following systems or a combination of the systems may
be monitored for I/M Readiness:
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The Catalyst
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The HO2S
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The HO2S Heater
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The EGR System
Important: The System Status display indicates only whether or not the test has been completed. The System Status display does not
necessarily mean that the test has passed. If a Failed Last Test indication is present for a DTC associated with one of the above systems, that
test is failed; diagnosis and repair is necessary in order to meet the I/M 240 requirement. Verify that the vehicle passes all of the diagnostic
tests associated with the displayed System Status' prior to returning the vehicle to the customer. Refer to the Typical OBD II Drive Cycle table
(more than one drive cycle may be needed) to use as a guide to complete the l/M 240 System Status tests.
Following a DTC info clear, the System Status will clear only for the Systems affected by any DTCs stored. Following a battery disconnect or
a Control Module replacement, all of the System Status information will clear.
