Turn the ignition switch OFF. Disconnect the redundant brake SW connector. Check for open or short to ground in the redundant brake SW circuit wire. Is a problem found? YES – Repair open or short to ground in the redundant brake SW circuit wire. NO – Go to step 18. Replace the redundant brake SW. Connect the ECM connector A. Is there DTC P1551 being output? YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM. NO – System is OK. NOTICE The battery power supply short circuit to 5 V power supply damages the ECM.

DTC P1610: ECM Communication Error Check the ''On Board Diagnostic (OBD) System Check''. Was the ''OBD System Check'' performed? YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM. NO – Go to OBD System Check. aaa