DTC P0685: ECM / PCM Power Relay Control Circuit / Open [06/2016 - ]: Procedure

1. Inspect the EFI MAIN1 relay (Refer to PROCEDURE - Step 1 ).

Result: 

NG 

REPLACE RELAY (EFI MAIN1) 

Result: 

OK 

See step  2

1. Disconnect the ECM connector.
2. Remove the EFI MAIN1 relay from the engine room relay block assembly.
3. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE (CHECK FOR OPEN)
   
   

   Tester Connection	Condition	Specified Condition
   EFI MAIN1 relay terminal 3 - A34-6 (+B)	Always	Below 1 Ω
   EFI MAIN1 relay terminal 3 - A33-1 (+B2)	Always	Below 1 Ω
   EFI MAIN1 relay terminal 1 - A35-13 (SSHUT)	Always	Below 1 Ω

   STANDARD RESISTANCE (CHECK FOR SHORT)
   
   

   Tester Connection	Condition	Specified Condition
   EFI MAIN1 relay terminal 3 or A34-6 (+B) - Body ground	Always	10 kΩ or higher
   EFI MAIN1 relay terminal 3 or A33-1 (+B2) - Body ground	Always	10 kΩ or higher
   EFI MAIN1 relay terminal 1 or A35-13 (SSHUT) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear the DTCs (Refer to DTC CHECK / CLEAR [06/2016 - ] ).
5. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
6. Enter the following menus: Powertrain / Engine / Trouble Codes.
7. Read DTCs.
   RESULT
   
   

   Result	Proceed to
   DTC is not output	A
   DTC P0685 is output	B

Result: 

A 

CHECK FOR INTERMITTENT PROBLEMS 

(Refer to CHECK FOR INTERMITTENT PROBLEMS [06/2016 - ] )

Result: 

B 

REPLACE ECM 

(Refer to REMOVAL [06/2016 - ] )