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MIL Circuit Troubleshooting
1. Connect an OBD II scan tool/Honda PGM Tester
(see page 11-3).
2. Turn the ignition switch ON (II), and read the OBD II
scan tool/Honda PGM Tester.
Does the OBD It scan tool/Honda
PGM
Tester
communicate
with the
ECM/PCM?
Y E S - G o to step 3.
NO — G o to troubleshooting "DLC Circuit
Troubleshooting" (see page 11-95).
3. Check the OBD II scan tool/Honda PGM Tester for
DTCs.
Are any DTCs
indicated?
Y E S
Go to the DTC Troubleshooting index.
N O - G o to step 4.
4. Turn the ignition switch O F F .
5. Turn the ignition switch ON (II), and watch the
Malfunction Indicator Lamp (MIL).
Does the MIL come on and stay on for more than
20 seconds
after turning the ignition switch
ON
(II)?
Y E S - If the MIL always come on and stays on, go
to step 16. But if the MIL sometimes works
normally, first check for these problems.
• An intermittent short in the wire between the
ECM/PCM (A10) and the Data Link Connector
(DLC).
• An intermittent open in the wire between the
ECM/PCM (A21) and the DLC.
• An intermittent short in the wire between the
ECM/PCM (A18) and the gauge assembly.
N O - I f the MIL is always off, go to step 6. But if the
MIL sometimes works normally, first check for
these problems.
• A loose No. 9 BACK UP LIGHT, INSTRUMENT
LIGHT (7.5A) fuse in the driver's under-dash fuse/
relay box.
• A loose A C G S (15A) fuse in the under-hood
fuse/relay box.
• A loose No. 1 F U E L PUMP (15A) fuse in the
driver's under-dash fuse/relay box.
• A poor connection at ECM/PCM terminal A18.
• An intermittent open in the GRN/ORN wire
between the ECM/PCM (A18) and the gauge
assembly.
• An intermittent short in the wire between the
ECM/PCM (C19) and the MAP sensor.
• An intermittent short in the wire between the
ECM/PCM (C28) and the TP sensor, EGR valve
position sensor, or Fuel Tank Pressure (FTP) Sensor.
6. Check the low oil pressure light.
Is the low oil pressure
light on?
Y E S - G o to step 7.
NO —Check for these problems.
• A blown No. 9 BACK UP LIGHT, INSTRUMENT
LIGHT (7.5A) fuse in the driver's under-dash fuse/
relay box.
• A short or open in the wire between the No. 9 BACK
UP LIGHT, INSTRUMENT LIGHT (7.5A) fuse and
the gauge assembly.
(cont'd)
11-91
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Table of Contents
Troubleshooting
