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DTC U0074:00 [PCM (SKYACTIV-G)]

DTC U0074:00 [PCM (SKYACTIV-G)]

SM2334465

id0102t4339600



Outline

System malfunction location

CAN system communication error (Local CAN between PCM and TCM)
Detection condition
• Malfunction in CAN bus communication line.
Fail-safe
• Not applicable
Possible cause
• CAN communication line malfunction between PCM and TCM (Local CAN between PCM and TCM)
• TCM detects DTCs.
• PCM malfunction
• TCM malfunction



Diagnostic Procedure

Step

Inspection

Results

Action
1
RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the freeze frame data/snapshot data.

Note
• Recording can be facilitated using the screen capture function of the PC.
—
Go to the next step.
2
VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY
• Verify related Service Bulletins, on-line repair information, or Service Information availability.
• Is any related Information available?
Yes
Perform repair or diagnosis according to the available information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT FOR OTHER RELATED DTCs
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any other DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G (US))].)
No
Go to the next step.
4
VERIFY TCM DTC
• Perform the DTC inspection for the TCM. (See DTC INSPECTION.)
• Are any DTCs displayed?
Yes
DTC U0074:00 or U0115:00 is displayed:
• CAN communication line can be considered the cause.
― Repair or replace the wiring harness between PCM and TCM.
― Go to repair completion verification.
DTC other than U0074:00 and U0115:00 is displayed:
• Repair the malfunctioning location according to the applicable DTC troubleshooting. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL) (US)].) (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EV6A-EL, EV6AX-EL) (US)].)
No
TCM can be considered the cause.
• Replace the control valve body and perform the repair completion verification. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL (US)].) (See CONTROL VALVE BODY REMOVAL/INSTALLATION [EV6A-EL, EV6AX-EL].)
Repair completion verification 1
VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Clear the DTC recorded in the memory. (See CLEARING DTC.)
• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
― Start the engine.
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Is the same Pending DTC present?
Yes
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)].)
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
No
Go to the next step.
Repair completion verification 2
VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection. (See DTC INSPECTION.)
• Are any other DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.