INSPECTION PROCEDURE B-3: R (reverse) position warning function does not work.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM
If the R (Reverse) position alarm function does not work normally, the input signal circuits to the components below or the ETACS-ECU may be defective.

  • Ignition switch (IG1)
  • Shift lever IND (R illuminated)

POSSIBLE CAUSES

  • Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

Step 1. ECU check by using the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

  • Ignition switch: ON
ECU TO BE CHECKED
  • ETACS
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible ."

Step 2. Function diagnosis by using the SWS monitor
Check the SWS communication signal, which are related to the R (reverse) position warning function.
<Selected item> BUZZER - REVERSE ALRM
  • Ignition switch: ON
  • Inhibitor switch: R (reverse) position
Item No.
 Item name
 Normal condition
Item 30
 IG SW(IG1)
 OFF
Item 43
 BUZZER
 ON
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?
Normal conditions are displayed for all the items : Go to Step 4.
Normal condition is not displayed for item No.30 : Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received ."
Normal condition is not displayed for item No.43 : Go to Step 3.

Step 3. Pulse check.
Check the input signal, which are related to the R (reverse) position warning function.
System switch
 Check condition
Inhibitor switch (reverse position)
 When the ignition switch is turned ON and the selector lever is moved to the R position.
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?
Go to Step 4.
Refer to diagnosis code No.11 inspection procedure "Engine-A/T-ECU time-out (related to engine) ."

Step 4. Retest the system.
Check that the R (reverse) position alarming function works normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.