[Previous][Next]
DTC Description
 
 
DESCRIPTION
This ECM contains a timer and measures time between an ignition switch OFF and the next ignition switch ON. This enables the judging of the state of engine cooling at an engine start.
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P261000ECM/PCM INTERNAL ENG OFF TIMER
(ECM/PCM engine off timer performance)
Diagnosis condition
Signal (terminal)
Threshold
  • ECM internal engine off timer is malfunctioning
  • The time calculated by ECM based on a descent allowance of engine coolant temperatures during ignition switch OFF is extremely shorter than the time counted by the Engine internal OFF timer
Diagnosis delay time
 
 
POSSIBLE CAUSE
  • ECM
  • ECM power supply
 
 
FAIL-SAFE
Not applicable
 
 
DTC Confirmation Procedure
1.INSPECTION START
It is necessary to erase permanent DTC?
.
.
 
2.PRECONDITIONING
  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 12 V or more under ignition switch OFF condition.
: .
 
3.PERFORM DTC CONFIRMATION PROCEDURE-I
  1. Turn ignition switch ON and wait at least 190 seconds.
  2. Check 1st trip DTC.
Is 1st trip DTC detected?
INSPECTION END
 
4.PRECONDITIONING
  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
  • Before performing the following procedure, confirm that battery voltage is 12 V or more under ignition switch OFF condition.
  • Before performing the following procedure, check that fuel level is between 2/8 and 7/8.
: .
 
5.PERFORM DTC CONFIRMATION PROCEDURE-I
  1. Turn ignition switch ON and wait at least 190 seconds.
  2. Check 1st trip DTC.
Is 1st trip DTC detected?
.
 
6.PERFORM DTC CONFIRMATION PROCEDURE-II
cautionTo start this self-diagnosis, the conditions listed bellow are required to be satisfied. Perform the following steps to satisfy the conditions.
  • Engine coolant temperature decrease by 55°C (131°F) or more during the time between an ignition switch OFF (after engine warm-up) and the second ignition switch ON.
  • A fuel temperature at the second ignition switch ON is −5°C (23°F) or more and less than 35°C (95°F).
  • The temperature difference between engine coolant and fuel is 5°C (41°F) or more.
noteThis self-diagnosis is not performed if the distance traveled is extremely short.
  1. Turn ignition switch ON.
  2. Start engine and warm it up to normal operating temperature.
  3. Turn ignition switch OFF and soak the vehicle for at least 12 hours.
    caution
    • Never turn ON the ignition switch during soaking.
    • Never open the fuel filler cap and perform refueling during soaking.
  4. Turn ignition switch ON and wait at least 190 seconds.
  5. Check 1st trip DTC.
Is 1st trip DTC detected?
INSPECTION END