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DTC C1616: Cranking Signal System (ON sticking)








caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION


AWC-ECU receives the signal of the ignition switch from ETACS-ECU via CAN communication.

DTC SET CONDITIONS


The code is set when the cranking signal is set for five seconds or more continuously while driving.

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .) After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q. Is DTC No. C1616 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code

  • Check the KOS diagnostic trouble code. (Refer to GROUP 42B - Troubleshooting .)
  • Check the WCM diagnostic trouble code. (Refer to GROUP 42C - Troubleshooting .)
  • Check the ETACS diagnostic trouble code. (Refer to GROUP 54A - Troubleshooting .)

Q. Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. Scan tool service data
Item 42: Ignition switch (Refer to Service Data Reference Table .)

Q. Is the check result normal?
Go to Step 9.
Go to Step 5.

STEP 5. Ignition switch check
(1)Disconnect C-210 ignition switch connector, and check the continuity between the terminals No. 1 and No. 5 at the ignition switch side.
(2)Turn the ignition switch to the "ON" position.
OK: No continuity

Q. Is the check result normal?
Go to Step 6.
Replace the ignition switch. (Refer to GROUP 54A - Ignition Switch .) Then go to Step 10.

STEP 6. Ignition switch connector, ETACS-ECU connector check: C-210, C-315

Q. Is the check result normal?
Go to Step 7.
Repair the defective connector. Then go to Step 10.

STEP 7. Check the wiring harness between C-210 ignition switch connector terminal No. 5 and C-315 ETACS-ECU connector terminal No. 7.
Check the wiring harness for short circuit (short to power supply).

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness. Then go to Step 10.

STEP 8. Scan tool service data
ETACS item No. 287: Starter switch (Refer to GROUP 54A - ETACS .)

Q. Is the check result normal?
Go to Step 9.
Replace the ETACS-ECU. (Refer to GROUP 54A - ETACS-ECU .) Then go to Step 9.

STEP 9. Check whether the DTC is reset.

Q. Is DTC No. C1616 set?
Replace the AWC-ECU.(Refer to .) Then go to Step 10.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 10. Check whether the DTC is reset.

Q. Is DTC No. C1616 set?
Return to Step 1.
This diagnosis is complete.