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DTC C1565 Engine revolution data invalid
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
  • Electric power steering-ECU receives engine revolution signal from the engine control module (ECM).
 
 
 
FUNCTION
  • The engine speed signal is sent to the electric power steering-ECU for motor control.
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • The power supply circuit system DTC (No. C1540, C1541) is not set.
  • The engine circuit system DTC is not set.
Judgment Criterion
  • If the microcomputer receives abnormal engine speed signal from the engine control module (ECM), it determines that the engine speed calculation system is defective.
Fail Safe, Back Up Function
  • The EPS-ECU illuminates the electric power steering warning symbol, and sets DTC No. C1565. Normally the assist operation continues while the vehicle is driven, but deactivated after the vehicle is stopped.
 
 
 
PROBABLE CAUSES
  • Malfunction of CAN bus line
  • Malfunction of the electric power steering-ECU
  • Malfunction of the engine control module (ECM)
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. DTC recheck after resetting CAN bus lines
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC C1565 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Using scan tool MB991958 data list
Check the following service data .
  • Item No. 07: Engine speed
Is the check result normal?
Go to Step 5.
Perform troubleshooting for engine control module (ECM) (Refer to GROUP 13A - Troubleshooting/Inspection Chart for DTC <2.0L Engine> or GROUP 13C - Troubleshooting/Inspection Chart for DTC <2.4L Engine>). Then go to Step 4.
 
STEP 4. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC C1565 set?
Replace the electric power steering-ECU (Refer to ). Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
 
STEP 5. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC C1565 set?
Return to Step 1.
This diagnosis is complete.