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DTC P0691: Radiator fan1 relay circuit low
DTC P0692: Radiator fan1 relay circuit high
DTC P0693: Radiator fan2 relay circuit low
DTC P0694: Radiator fan2 relay circuit high
 
 
cautionWhenever ECU is replaced, ensure that the CAN bus lines are normal.
note
  • Display on scan tool (M.U.T.-IIISE): Radiator fan 1 relay→Designation in workshop manual: Radiator fan relay
  • Display on scan tool (M.U.T.-IIISE): Radiator fan 2 relay→Designation in workshop manual: Condenser fan relay
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart <DTC P0691>
Check Conditions <DTC P0691>
  • The PHEV-ECU power supply voltage is more than 9.0 volts.
  • The radiator fan relay activation command off.
Judgment Criterion <DTC P0691>
  • The radiator fan relay is on for 2 seconds.
Logic Flow Chart <DTC P0692>
Check Conditions <DTC P0692>
  • The PHEV-ECU power supply voltage is more than 9.0 volts.
  • The radiator fan relay activation command on.
Judgment Criterion <DTC P0692>
  • The radiator fan relay is off for 2 seconds.
Logic Flow Chart <DTC P0693>
Check Conditions <DTC P0693>
  • The PHEV-ECU power supply voltage is more than 9.0 volts.
  • The condenser fan relay activation command off.
Judgment Criterion <DTC P0693>
  • The condenser fan relay is on for 2 seconds.
Logic Flow Chart <DTC P0694>
Check Conditions <DTC P0694>
  • The PHEV-ECU power supply voltage is more than 9.0 volts.
  • The condenser fan relay activation command on.
Judgment Criterion <DTC P0694>
  • The condenser fan relay is off for 2 seconds.
 
 
OBD-II DRIVE CYCLE PATTERN <DTC P0691, P693>
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
OBD-II DRIVE CYCLE PATTERN <DTC P0692, P0694>
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 6 .
 
 
PROBABLE CAUSES
  • Damaged harness or connector.
  • Malfunction of the radiator fan relay.
  • Malfunction of the condenser fan relay.
  • Malfunction of the PHEV-ECU.
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Check the radiator fan relay and the condenser fan relay.
When the DTC P0691 is set.
  • Check the radiator fan relay (Refer to GROUP 14A - On-vehicle Service, Cooling fan relay continuity check ).
When the DTC P0692 is set.
  • Check the radiator fan relay (Refer to GROUP 14A - On-vehicle Service, Cooling fan relay continuity check ).
When the DTC P0693 is set.
  • Check the condenser fan relay (Refer to GROUP 14A - On-vehicle Service, Cooling fan relay continuity check ).
When the DTC P0694 is set.
  • Check the condenser fan relay (Refer to GROUP 14A - On-vehicle Service, Cooling fan relay continuity check ).
Is the check result normal?
Go to Step 2.
Replace the damaged radiator fan relay or condenser fan relay. Then go to Step 5.
 
STEP 2. Check the fusible link SBF4 (relay box 1) and SBF1 (relay box 1).
Is the check result normal?
Go to Step 3.
Replace the damaged fusible link. Then go to Step 5.
 
STEP 3. Check the power supply line for open circuit and short to ground circuit [fusible link (SBF1 or SBF4) and the PHEV-ECU].
When the DTC P0691 or P0692 is set.
  • Check the wiring harness between fusible link (SBF4) and the PHEV-ECU connector (terminal RFR1).
When the DTC P0693 or P0694 is set.
  • Check the wiring harness between fusible link (SBF1) and the PHEV-ECU connector (terminal RFR2).
Is the check result normal?
Go to Step 4.
Repair the connector or wiring harness. Then go to Step 5.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ). Then go to Step 5.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 5. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 <DTC P0691, P0693>, Pattern 6 <DTC P0692, P0694>.
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.