Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATION OF CIRCUIT OPENING RELAY)
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream ON.
3. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the Fuel Pump/Speed.
4. Check whether relay operating sounds can be heard while operating the relay using the Techstream.
  OK:
  
  Relay operating sounds can be heard from relay.
  
  OK: Go to step 7
  
  NG: Go to next step
INSPECT ECM POWER SOURCE CIRCUIT
NG: REPAIR OR REPLACE POWER SOURCE CIRCUIT

OK: Go to next step

INSPECT CIRCUIT OPENING RELAY (C/OPN RELAY)

Remove the circuit opening (C/OPN) relay from the engine room R/B.

Check the circuit opening relay resistance.

Standard Resistance

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

Tester Connections	Specified Conditions
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage applied to terminals 1 and 2)

Fig 1: Circuit Opening Relay Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reinstall the circuit opening relay.
NG: REPLACE CIRCUIT OPENING RELAY

OK: Go to next step

INSPECT ECM (FC VOLTAGE)

Turn the ignition switch to ON.

Measure the voltage between the terminals of the ECM connectors.

Standard Voltage

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

Tester Connections	Specified Conditions
FC (E8-25) - E1 (E4-3)	9 to 14 V

OK: REPLACE ECM (See REMOVAL )

Fig 2: Identifying ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CIRCUIT OPENING RELAY)

Disconnect the I7 ignition switch connector.
Remove the circuit opening (C/OPN) relay from the engine room R/B.

Check the resistance.

Standard Resistance (Check for open)

TERMINAL SPECIFIED CONDITION CHART

Terminal Connections	Specified Conditions
IG2 (17-6) - Engine room R/B (Circuit opening relay terminal 1)	Below 1 Ω

Standard Resistance (Check for short)

TERMINAL SPECIFIED CONDITION CHART

Terminal Connections	Specified Conditions
IG2 (I7-6) or Engine room R/B (Circuit opening relay terminal 1) - Body ground	10 kΩ or higher

Reinstall the circuit opening relay.
Reconnect the ignition switch connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Identifying Circuit Opening Relay And Ignition Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY)

Disconnect the E8 ECM connector.
Remove the circuit opening (C/OPN) relay from the engine room R/B.

Check the resistance.

Standard Resistance (Check for open)

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

Tester Connections	Specified Conditions
FC (E8-25) - Engine room R/B (Circuit opening relay terminal 2)	Below 1 Ω

Standard Resistance (Check for short)

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

Tester Connections	Specified Conditions
FC (E8-25) or Engine room R/B (Circuit opening relay terminal 2) - Body ground	10 kΩ or higher

Reinstall the circuit opening relay.
Reconnect the ECM connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Identifying Circuit Opening Relay And ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM (See REMOVAL )

INSPECT FUEL PUMP ASSEMBLY
HINT:

Refer to Fuel Pump Inspection (See INSPECTION ).

NG: REPLACE FUEL PUMP ASSEMBLY (See REMOVAL )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND)

Remove the circuit opening (C/OPN) relay from the engine room R/B.
Disconnect the F19 fuel pump connector.

Check the resistance.

Standard Resistance (Check for open)

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

Tester Connections	Specified Conditions
Engine room R/B (Circuit opening relay terminal 3) - Fuel pump (F19-4)	Below 1 Ω
Fuel pump (F19-5) - Body ground	Below 1 Ω

Standard Resistance (Check for short)

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

Tester Connections	Specified Conditions
Engine room R/B (Circuit opening relay terminal 3) or Fuel pump (F19-4) - Body ground	10 kΩ or higher

Reconnect the fuel pump connector.
Reinstall the circuit opening relay.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Identifying Fuel Pump Connector And Circuit Opening Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: CHECK AND REPLACE HARNESS AND CONNECTOR (EFI RELAY - C/OPN RELAY)