( SMR7E3JK791000R5611FAAT00 )

SRS DTC Troubleshooting: 56-11

DTC 56-11:

Lost communication with the ECM (engine message)

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures.

Turn the ignition switch ON (II), and see if the malfunction indicator lamp (MIL) comes on.

Does the malfunction indicator lamp (MIL) come on?

YES	-	Go to Step 2 .
NO	-	Go to the PGM-FI System MIL circuit Troubleshooting.

Erase the DTC memory.

Turn the ignition switch ON (II), and wait for 10 seconds.

Read the DTC.

Is DTC 56-11 indicated?

YES	-	Go to Step 5 .
NO	-	Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC Troubleshooting Index.

Turn the ignition switch OFF.

Disconnect the negative cable from the battery, and wait for 3 minutes.

Disconnect SRS unit connector A (28P) from the SRS unit.

Disconnect ECM connector A (44P) from the ECM.

Install a jumper wire between the No. 11 and No. 12 terminals of SRS unit connector A (28P).

Check resistance between the No. 36 and No. 37 terminals of ECM connector A (44P). There should be 0−1.0 Ω

Is the resistance as specified?

YES	-	Faulty SRS unit or poor connection at SRS unit connector A (28P) and the SRS unit. Check the connection between the connector and the SRS unit. If the connection is OK, replace the SRS unit.
NO	-	Open between the No. 11 terminal of SRS unit connector A (28P) and No. 36 terminal of ECM connector A (44P), or between the No. 12 terminal of SRS unit connector A (28P) and No. 37 terminal of ECM connector A (44P); replace the faulty harness.■