Engine Controls: Important Preliminary Checks; Intermittents; Diagnostic Trouble Codes - Daewoo Nubira Owner's Manual

Important : Several symptom procedures call for a careful visual/physical inspection. Always perform the visual/physical
test first. Visual inspections may lead to correcting a problem without further checks and can save valuable time.
Step
1 Perform an On–Board Diagnostic (OBD II) System
Check.
Is the check complete?
2
1. Inspect all of the powertrain control module
(PCM)/engine control module (ECM) ground
connections.
2. Inspect all of the vacuum hoses for splits,
kinks, and proper connections.
3. Check for air leaks at all of the mounting areas
of the intake manifold sealing surfaces.
4. Inspect the ignition wires for cracking, hard-
ness, proper routing, and carbon tracking.
5. Inspect the wiring for proper connections,
pinches, and cuts.
Are all checks complete?
The problem may or may not illuminate the
Malfunction Indicator Lamp (MIL) or store a
diagnostic trouble code (DTC).
Important : Do not use the DTC tables for intermittent
problems. A fault must be present in order to locate the
problem. If a fault is intermittent, use of DTC tables may
result in the replacement of good parts.
Step
1 Were the Important Preliminary Checks performed?
2
1. Perform a careful inspection of any suspect
circuits.
2. Inspect for poor mating of the connector
halves, or terminals not fully seated into the
connector body.
3. Inspect for improperly formed or damaged ter-
minals.
4. Inspect for poor terminal to wire connections.
This requires removing the terminal from the
connector body to inspect it.
Are any problems present?
3 Repair the electrical connections as needed.
Is the repair complete?
DAEWOO V–121 BL4
SYMPTOM DIAGNOSIS
IMPORTANT PRELIMINARY CHECKS
Action

INTERMITTENTS

Action
ENGINE CONTROLS 1F – 357
Value(s) Yes
Go toStep 2
Go to Appropri-
ate Symptom
Table
Value(s) Yes
Go toStep 2
Go toStep 3
System OK
No
Go to"On–
Board Diagnos-
tic System
Check"
No
Go to"Impor-
tant Preliminary
Checks"
Go toStep 4