DTC P0691 - Cooling Fan 1 Control Circuit Low -

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction
TROUBLE SYMPTOM:
- Radiator fan does not operate properly.
- Overheating

CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >

WIRING DIAGRAM:

Fig 1: Cooling Fan Control Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK OUTPUT SIGNAL FROM ECM. Turn ignition switch to OFF. Connect test mode connector at the lower portion of instrument panel (on the driver's side). Turn ignition switch to ON. While operating radiator fan relay, measure voltage between ECM terminal and ground. NOTE: Radiator fan relay operation can be executed using Subaru Select Monitor. For procedure, < Ref. to COMPULSORY VALVE OPERATION CHECK MODE . > Connector & terminal (B134) No. 14 (+) - Chassis ground (-);	Is the measured value within 0 to 10 V?	Repair poor contact in ECM connector.	Go to step 2.
2 CHECK GROUND SHORT CIRCUIT IN RADIATOR FAN RELAY 1 CONTROL CIRCUIT. Turn ignition switch to OFF. Disconnect connectors from ECM and remove main fan relay from A/C relay holder. Measure resistance of harness between ECM connector and chassis ground. Connector & terminal (B134) No. 14 - Chassis ground:	Is the measured value more than 1 MΩ?	Go to step 3.	Repair ground short circuit in radiator fan relay 1 control circuit.
3 CHECK POWER SUPPLY FOR RELAY. Turn ignition switch to ON. Measure voltage between fuse and relay box (F/B) connector and chassis ground. Connector & terminal (F27) No. 5 (+) - Chassis ground (-):	Is the measured value more than 10 V?	Go to step 4.	Repair open circuit in harness between ignition switch and fuse and relay box (F/ B) connector.
4 CHECK MAIN FAN RELAY. Turn ignition switch to OFF. Measure resistance between main fan relay terminals. Terminal No. 5 - No. 7:	Is the measured value within 87 to 107 Ω?	Go to step 5.	Replace main fan relay.
5 CHECK OPEN CIRCUIT IN MAIN FAN RELAY CONTROL CIRCUIT. Measure resistance of harness between ECM and main fan relay connector. Connector & terminal (B134) No. 14 - (F27) No. 7:	Is the measured value less than 1 Ω?	Go to step 6.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ECM and main fan relay connector Poor contact in coupling connector
6 CHECK POOR CONTACT. Check poor contact in ECM or main fan relay connector.	Is there poor contact in ECM or main fan relay connector?	Repair poor contact in ECM or main fan relay connector.	Contact with SOA service center.