6E1-208 DRIVEABILITY AND EMISSIONS
Diagnostic Aids
An intermittent MIL may be caused by a poor
connection, rubbed-through wire insulation, or a wire
broken inside the insulation. Check for the following
items:
• Inspect the ECM harness and connections for
improper mating, broken locks, improperly formed
or damaged terminals, poor terminal-to-wire
connection, and damaged harness.
• If the engine runs OK, check for a faulty light bulb,
an open in the MIL driver circuit, or an open in the
instrument cluster ignition feed.
• If the engine cranks but will not run, check for an
open ECM ignition or battery feed, or a poor ECM to
engine ground.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. A “No MIL” condition accompanied by a no-start
condition suggests a faulty ECM ignition feed or
battery feed circuit.
9. Using a test light connected to B+, probe each of
the ECM ground terminals to ensure that a good
ground is present. Refer to ECM Terminal End
View for terminal locations of the ECM ground
circuits.
DTC (Flash DTC = 56)
Check Engine Lamp Low Error
Step Action Value(s) Yes No
1
Was the “On-Board Diagnostic (OBD) System
Check” performed? -
Go to Step 2
Go to OBD
System
Check
2
Attempt to start the engine.
Does the engine start?
-
Go to Step 3 Go to Step 6
3
Check the meter fuse for the instrument cluster turn, back
and gauge.
Is the fuse OK?
-
Go to Step 4 Go to Step 16
5
1. Ignition OFF.
2. Disconnect the ECM.
3. Jumper the MIL driver circuit at the ECM connector to
ground.
4. Ignition ON.
Is the MIL ON?
-
Go to Step 10 Go to Step 11
6
Check the ECM ignition feed and battery feed fuses
(15A Ignition fuse and 15A ECM fuse).
Are both fuses OK?
-
Go to Step 8 Go to Step 15
8
Probe the battery feed circuit at the ECM harness
connector with a test light to ground.
Is the test light ON?
-
Go to Step 9 Go to Step 14
9
Check for a faulty ECM ground connection.
Was a problem found?
-
Verify repair Go to Step 10
10
Check for damaged terminals at the ECM.
Was a problem found?
-
Verify repair Go to Step 17
11
Check for an open MIL driver circuit between the ECM and
the MIL.
Was a problem found?
-
Verify repair Go to Step 18
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