Honda Accord 2008 Manual page 2878

07/11/02 09:50:50 61TA0000_240_0155
DTC 56-31: Lost Communication With the
ECM/PCM (PGM-FI system)
NOTE:
• Before doing this troubleshooting procedure, review
SRS Precautions and Procedures (see page 24-23)
and General Troubleshooting Information (see page
24-35).
• Check for any F-CAN and B-CAN communication
DTCs, and troubleshoot those DTCs before doing this
troubleshooting procedure.
• 2-door: Before replacing the SRS unit, check the SRS
unit software version with the HDS. If the software
version is not the latest, update the SRS unit software
(see page 24-38) and retest.
1. Clear the DTC memory (see page 24-36).
2. Turn the ignition switch to ON (II), then wait for 10
seconds.
3. Read the DTC (see page 24-36).
Is DT C 56-31 indicated?
YES − Go to step 4.
−
NO Intermittent failure, the system is OK at this
time. Go to Troubleshooting Intermittent Failures
(see page 24-37). If another DTC is indicated,
troubleshoot the DTC.
4. Turn the ignition switch to ON (II), and see if the
malfunction indicator lamp (MIL) comes on.
Does the MIL come on?
YES − Go to the PGM-FI System troubleshooting
(see page 11-3).
NO − Go to step 5.
5. Read the DTC (see page 24-36).
Are any other DT Cs indicated with 56-31?
YES − Go to step 6.
NO − Go to the PGM-FI System troubleshooting
(see page 11-3).
6. Turn the ignition switch to LOCK (0).
7. Do the battery terminal disconnection procedure
(see page 22-89), then wait for 3 minutes.
8. Disconnect SRS unit connector A (39P) from the
SRS unit (see step 8 on page 24-34).
9. Disconnect ECM/PCM connector A (49P) from the
ECM/PCM (see page 11-6).
10. Check for continuity between the No. 16 terminal of
SRS unit connector A (39P) and the No. 4 terminal
of ECM/PCM connector A (49P), and between the
No. 17 terminal of SRS unit connector A (39P) and
the No. 3 terminal of the ECM/PCM connector A
(49P).
SRS UNIT CONNECTOR A (39P)
Wire side of male terminals
ECM/PCM CONNECTOR A (49P)
Terminal side of male terminals
Is there continuity?
−
YES Faulty SRS unit or poor connection at SRS
unit connector A (39P) and the SRS unit. Check the
connection between the connector and the SRS
unit. If the connection is OK, replace the SRS unit
(see page 24-223).
−
NO Open in the left engine compartment wire
harness or the dashboard wire harness; replace the
faulty harness.
ＴＡ０８ＡＥ４Ｋ７９１０００Ｒ５６３１ＦＡＡＴ００
＊０１
24-155