DTC U0401:68 [Advanced Keyless Entry And Push Button Start System]

DESCRIPTION	Receiving erratic data from PCM
DETECTION CONDITION	Keyless control module receives the erratic data from PCM when the ignition switch is ON.
POSSIBLE CAUSE	PCM DTC is stored PCM malfunction Keyless control module malfunction

DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	CONFIRM PCM DTC Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [LF, L5] ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [LF, L5] ).
1		No	Go to the next step.
2	VERIFY PCM MALFUNCTION Clear the DTC from the keyless control module using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Switch the ignition to off, then to ON. Perform the advanced keyless entry and push button start system DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [LF, L5] ).
2		No	Go to Step 4.
3	VERIFY TROUBLESHOOTING COMPLETED Clear the DTC from the keyless control module using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Switch the ignition to off, then to ON. Perform the advanced keyless entry and push button start system DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Is the same DTC present?	Yes	Replace the keyless control module, then go to the next step. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION ).
3		No	Go to the next step.
4	VERIFY THAT NO OTHER DTCs ARE PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ).
4		No	DTC troubleshooting completed.