DTC P0691: Cooling Fan 1 Control Circuit Low
- OUTLINE OF DIAGNOSIS
- Detect the open/short circuit of radiator fan circuit.
- Judge NG when the ECM output level and the actual terminal level are different.
- ENABLE CONDITION ENABLE CONDITION
Secondary Parameters Enable Conditions Engine speed "GREATER THAN EQUAL TO" 500 rpm Battery voltage "GREATER THAN EQUAL TO" 8V After engine starting 1 second or more Ignition switch ON - GENERAL DRIVING CYCLE
Always perform the diagnosis continuously after starting the engine.
- DIAGNOSTIC METHOD
Judge NG when the continuous time until completing the malfunction criteria below becomes more than the time (2.5 seconds) needed for diagnosis, and also judge OK when the malfunction criteria below is not completed. And then clear NG.
Judgment Value
JUDGMENT VALUEMalfunction Criteria Threshold Value Terminal voltage level when ECM transmits OFF signal Low level Time Needed for Diagnosis: 2.5 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
- MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
- FAIL SAFE
None
- ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)