Honda 2004 Odyssey Service Manual page 481

PGM-FI System
MIL Circuit Troubleshooting (cont'd)
21. Turn the ignition switch ON (II), and measure
voltage between body ground and PCM connector
terminals A4, A5, A25, and A26 individually.
PCM CONNECTOR A (31P)
PG2 (BLK)
LG2
(BRN/BLK)
Wire side of female terminals
Is there less than 1.0 V ?
YES Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
NO Repair the open in the wire(s) that had more
than 1.0 V between G101 and the PCM (A4, A5, A25,
and A26).
22. Turn the ignition switch OFF, then turn it back ON
(II), and measure voltage between PCM connector
terminal E16 and body ground.
PCM CONNECTOR E (31P)
Wire side of female terminals
Is there about 5 V ( or battery voltage)?
YES Go to step 26.
NO Go to step 23.
11-172
PG1 (BLK)
LG1
(BRN/BLK)
SCS (BRN)
23. Turn the ignition switch OFF.
24. Disconnect PCM connector E (31P).
25. Check for continuity between PCM connector
terminal E16 and body ground.
PCM CONNECTOR E (31P)
Wire side of female terminals
Is there continuity?
YES Repair short in the wire between the data link
connector (DLC) and the PCM (E16).
NO Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
26. Turn the ignition switch OFF.
27. Disconnect PCM connector E (31P).
28. Turn the ignition switch ON (II).
Does the MIL stay on?
YES Repair short in the wire between the gauge
assembly and the PCM (E4).
NO Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
SCS (BRN)