DTC P115B:68 [MZ-CD 1.6]

id0102g8346700

DTC P115B:68

Low fuel level - forced engine shutdown
DETECTION CONDITION
•  The PCM receives a fuel level signal from the instrument cluster via CAN communication. If the fuel injector amount continuously exceeds 1.2 L {1.3 US qt, 1.1 Imp qt} for 30 s after receiving a signal from the instrument cluster that the remaining fuel level is low, the PCM determines that the fuel level is low.
POSSIBLE CAUSE
•  No fuel in tank
•  Fuel gauge (in instrument cluster) malfunction
•  Fuel gauge sender unit malfunction
•  Communication error between instrument cluster and PCM
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY STORED CAN COMMUNICATION DTC IN PCM AND INSTRUMENT CLUSTER
•  Retrieve the PCM and instrument cluster DTC using the M-MDS.
•  Is the CAN communication DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
(See DTC TABLE [INSTRUMENT CLUSTER].)
No
Go to the next step.
4
INSPECT WHETHER MALFUNCTION IS LOW FUEL LEVEL OR INSTRUMENT CLUSTER
•  Clear the DTC from the PCM memory using the M-MDS.
•  Refill the fuel above 5 L {5 US qt, 4 Imp qt}.
•  Start the engine and warm it up completely.
•  Perform the DTC Reading Procedure.
•  Is the DTC P0313:00, P115A:68 or P115B:68 present?
Note
•  If the refueling amount is low, the PCM stored DTC P0313:00, P115A:68 or P115B:68 continues.
Yes
Go to the next step.
No
If other DTC or PENDING CODE is stored:
•  Go to the applicable PENDING CODE or DTC inspection.
If any DTC is not stored:
•  DTC troubleshooting completed (the cause of this DTC is low fuel level).
―  Go to Step 6.
5
REINSPECT WHETHER MALFUNCTION IS LOW FUEL LEVEL OR INSTRUMENT CLUSTER
•  Refill the fuel till fuel level is above 5 L {5 US qt, 4 Imp qt}.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Refill the fuel above 5 L {5 US qt, 4 Imp qt}.
•  Start the engine and warm it up completely.
•  Perform the DTC Reading Procedure.
•  Is the DTC P0313:00, P115A:68 or P115B:68 present?
Yes
Inspect the fuel gauge.
(See INSTRUMENT CLUSTER INSPECTION.)
Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
No
If other DTC or PENDING CODE is stored:
•  Go to the applicable PENDING CODE or DTC inspection.
If any DTC is not stored:
•  DTC troubleshooting completed (the cause of this DTC is low fuel level).
―  Go to the next step.
6
VERIFY THAT DTC P115B:68 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
DTC troubleshooting completed.