Honda 2004 Odyssey, Service Manual

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Intermittent Failures
Opens and Shorts
How to Use the HDS or a Scan Tool
If the MIL (Malfunction Indicator Lamp) has come on
If the MIL did not stay on
If you can’t duplicate the DTC
11-3
General Troubleshooting Information
A
The term ‘‘intermittent failure’’ means a system may
have had a failure, but it checks OK now. If the
Malfunction Indicator Lamp (MIL) on the dash does not
come on, check for poor connections or loose wires at
all connectors related to the circuit that you are
troubleshooting.
‘‘Open’’ and ‘‘Short’’ are common electrical terms. An
open is a break in a wire or at a connection. A short is
an accidental connection of a wire to ground or to
another wire. In simple electronics, this usually means
something won’t work at all. With complex electronics
(such as PCM’s) this can sometimes mean something
works, but not the way it’s supposed to.
1. Start the engine, and check the MIL.
’01-04 Models
NOTE: If the ignition switch is turned ON (II), and
the engine is not started, the MIL will stay on for
15
20 seconds (see page 11-89).
2. If the MIL stays on, connect the HDS or an OBD II
scan tool to the Data Link Connector (DLC) (A)
located under the driver’s side of the dashboard.
3. Turn the ignition switch ON (II).
4. Check the Diagnostic Trouble Code (DTC) and note
it. Also check the freeze data. Refer to the DTC
Troubleshooting Index and begin the appropriate
troubleshooting procedure.
NOTE:
• Freeze data indicates the engine conditions when the
first malfunction, misfire or fuel trim malfunction was
detected.
• The HDS can read the DTC, freeze data, current data,
and other powertrain control module (PCM) data.
• For specific operations, refer to the user’s manual
that came with the HDS.
If the MIL did not stay on but there is a driveability
problem, do the symptom troubleshooting.
Some of the troubleshooting requires you to reset the
PCM and try to duplicate the DTC. If the problem is
intermittent and you can’t duplicate the DTC, do not
continue through the procedure. To do so will only
result in confusion and, possibly, a needlessly replaced
PCM.
(cont’d)
03/07/29 09:17:44 61S0X050_110_0003