Eldorado Touring V8-4.6L VIN 9 (1998)
or system may be reliably checked and not give a false failure indication.
CONDITIONS FOR SETTING THE DTC
The setting conditions are the conditions that must be met for the DTC to set. A failure condition is checked for only after the running conditions
(described above) have been met. If they are true, then an input or system failure is present and the DTC is set.
ACTION TAKEN WHEN THE DTC SETS
The actions taken are the steps the PCM takes after the DTC is set. These actions serve one of three purposes:
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To inform the driver of the problem.
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To preserve the driveability of the vehicle.
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To prevent the failure from causing any damage to the vehicle.
CONDITIONS FOR CLEARING THE MIL / DTC
These are the conditions that must be met for the MIL to go OFF and / or the DTC to clear.
DIAGNOSTIC AIDS
Most tables have one result which reads Fault not present. This means that the conditions that were present when the DTC set are no longer there.
Sometimes, with the help of snapshot on DTC set data (Freeze Frame or Failure Records) or information from the driver, the problem may still be
identified or at least narrowed down to a short list of possible intermittent failures. When this is true, the Diagnostic Aids may explain what to look for
and which direction to head in looking for an intermittent failure
TEST DESCRIPTION
The Test Descriptions are explanations of the reason certain checks are done and what the check is supposed to uncover. This information is numbered
and corresponds to the steps on the table. If you are performing a check and wonder why the check is being made or what the check is supposed to find,
observe the Step number next to the check you are performing. Refer to the information under Test Description that has the same number for an
explanation.
DIAGNOSTIC TABLE
Diagnostic tables are an organized and systematic approach to diagnosing a Diagnostic Trouble Code (DTC). The table consists of five separate
columns: step number, action, value, yes, and no. The step number indicates which step is being performed. The action column contains all necessary
information about how to perform a certain test. The last sentence in each action block will always be a question. The question can only be answered yes
or no. The answer to the question will dictate which column you will go to next - yes or no. The yes or no answer to each test will lead you to the next
step to be performed or a particular action to take. Most boxes will have a Go to Step X statement. If a yes or no block does not have a Go to Step X
statement, the text inside will be the last step taken on the table because it will either be a solution or a Fault not present condition.
Always begin with Step 1 at the top of the table unless there is a notice or caution above it. Never skip steps or jump ahead in the table. Taking short cuts
often leads to misdiagnosis. When a problem is found, make the necessary repairs and then verify the repair.
Powertrain OBD System Check
OBD SYSTEM CHECK DESCRIPTION
IMPORTANT: Understanding the table and using it correctly will reduce diagnosis time and prevent the unnecessary replacement of parts.
After the visual inspection is complete, the Powertrain OBD System Check should be performed. This Powertrain System Check will provide direction
for diagnosis of the following:
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PCM inoperative or damaged, no PCM data or SERVICE ENGINE SOON MIL inoperative.
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PCM DTCs.
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Fuel System Rich or Lean.
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Customer Complaint Driveability Symptoms. The Powertrain OBD System Check is designed as a Master table for driveability and emissions
system diagnosis. The System Check should always be used as the starting point for all Powertrain diagnosis.
The Powertrain OBD System Check is an organized approach for identifying a problem. Driver Comments normally fall into one of the following areas:
