( SMR9EQPK791000R5611FAAT00 )

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 and General Troubleshooting Information.

Turn the ignition switch to 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 to 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, troubleshoot the DTC.■

Turn the ignition switch to LOCK (0).

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 terminals No. 11 and No. 12 SRS unit connector A (28P).

Check resistance between ECM connector A (49P) terminals No. 3 and No. 4 (L13Z1 engine model) or ECM connector A (44P) terminals No. 36 and No. 37 (except L13Z1 engine model). There should be less than 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 in the engine compartment wire harness or the combination switch wire harness; replace the faulty harness, then clear the DTC.■