DTC B1731: PCM/PHEV authentification T/out: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Recheck for diagnostic trouble code.
Recheck if the DTC is stored in ETACS-ECU.

CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Erase the DTC.
3. Remove the ignition key from key cylinder and insert it again then turn the ignition switch from the Lock (OFF) position to the ON position.
4. On completion, check that the DTC is not stored again.
Q: Is the DTC stored?
1. YES: Go to Step 2.
2. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 2. Using scan tool (M.U.T.-III), diagnose the CAN bus line
1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
1. YES: Go to Step 3.
2. NO: Repair the CAN bus line (Refer to DIAGNOSIS ). On completion, go to Step 3.
STEP 3. Using scan tool (M.U.T.-III), read the engine system diagnostic trouble code
Check whether an engine system DTC is stored.

Q: Is the DTC stored?
1. YES: Perform troubleshooting for the engine (Refer to DTC CHART for 2.4L or DIAGNOSTIC TROUBLE CODE CHART for 3.0L ).
2. NO: Go to Step 4.
STEP 4. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
Check if DTC No. U0100 stored in ETACS-ECU.

Q: Is the DTC stored?
1. YES: Go to Step 6.
2. NO: Go to Step 5.
STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is stored in ETACS-ECU.
1. Remove the ignition key from key cylinder and insert it again then turn the ignition switch from the Lock (OFF) position to the ON position.
2. Check if the DTC is stored.
Q: Is the DTC stored?
1. YES: Replace ETACS-ECU and register the ID codes (Refer to HOW TO REGISTER KEY ID ).
2. NO: Intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is stored in ETACS-ECU.
1. Remove the ignition key from key cylinder and insert it again then turn the ignition switch from the Lock (OFF) position to the ON position.
2. Check if the DTC is stored.
Q: Is the DTC stored?
1. YES: Replace the ECM and register the chassis number and key codes [Refer to HOW TO PERFORM VIN WRITING FOR ENGINE CONTROL MODULE, KOS-ECU AND ETACS-ECU ].
2. NO: The diagnosis is complete.