Integration Relay Inspection

Engine. Lexus Gs430, Gs300. Uzs190 Grs190

3Gr-Fse Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

INSPECT INTEGRATION RELAY

Integration Relay -- Inspection

1. INSPECT INTEGRATION RELAY

NOTICE:

Some relays are built into the integration relay (unit: A). The integration relay cannot be disassembled. If there is a malfunction in the circuit of the integration relay, replace the integration relay.

The internal circuit of the integration relay is as shown in the illustration. Inspect the integration relay using the following procedures.

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System.Integration Relay Inspection

Measure the resistance of the C/OPN relay.
1. Connect the battery's positive (+) lead to terminal 2A-8 and negative (-) lead to terminal 2B-33. Using an ohmmeter, check resistance between the terminals when battery voltage is applied between the terminals.
  Standard resistance:
  Tester Connection
  Specified Condition
  2C-2 - 2B-7
  Below 1 Ω
  2C-1 - 2B-8
  10 kΩ or higher
2. Connect the battery's positive (+) lead to terminals 2A-8 and 2C-1, and negative (-) lead to terminal 2B-3 and 2B-7. Using an ohmmeter, check that there is resistance between terminals 2C-1 and 2B-8 when battery voltage is applied between the terminals.
  Standard resistance:
  Tester Connection
  Specified Condition
  2C-1 - 2B-8
  Below 1 Ω
  (when battery voltage is applied to terminals 2A-8 and 2B-3, and 2C-1 and 2B-7)

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System.Integration Relay Inspection

Measure the resistance of the EFI MAIN relay.
1. Remove the EFI fuse. Using an ohmmeter, measure the resistance between the terminals.
  Standard resistance:
  Tester Connection
  Specified Condition
  2A-6 - 2A-7
  Below 1 Ω
  EFI fuse terminal 2 - 2A-8
  10 kΩ or higher
2. Connect the battery's positive (+) lead to terminal 2A-6 and negative (-) lead to terminal 2A-7. Using an ohmmeter, check that there is resistance between EFI fuse terminal 2 and terminal 2A-8 when battery voltage is applied between the terminals.
  Standard resistance:
  Tester Connection
  Specified Condition
  EFI fuse terminal 2 - terminal 2A-8
  Below 1 Ω
  (when battery voltage is applied to terminals 2A-6 and 2A-7)

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System.Integration Relay Inspection

Measure the resistance of the EFI NO. 2 relay.
1. Using an ohmmeter, measure the resistance between the terminals.
  Standard resistance:
  Tester Connection
  Specified Condition
  2B-3 - 2A-8
  Below 1 Ω
  2B-7 - 2C-1
  10 kΩ or higher
2. Connect the battery's positive (+) lead to terminal 2A-8 and negative (-) lead to terminal 2B-3. Using an ohmmeter, check that there is resistance between terminals 2B-7 and 2C-1 when battery voltage is applied between the terminals.
  Standard resistance:
  Tester Connection
  Specified Condition
  2B-7 - 2C-1
  Below 1 Ω
  (when battery voltage is applied to terminals 2B-3 and 2A-8)

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System.Integration Relay Inspection

Measure the resistance of the EFI INJ relay.
1. Remove the INJ fuse. Using an ohmmeter, measure the resistance between the terminals.
  Standard resistance:
  Tester Connection
  Specified Condition
  2A-1 - 2A-3
  Below 1 Ω
  INJ fuse terminal 2 - C4
  10 kΩ or higher
2. Connect the battery's positive (+) lead to terminal 2A-1 and negative (-) lead to terminal 2A-3. Using an ohmmeter, check that there is resistance between INJ fuse terminals 2 and terminal 2A-4 when battery voltage is applied between the terminals.
  Standard resistance:
  Tester Connection
  Specified condition
  INJ fuse terminal 2 - terminal 2A-4
  Below 1 Ω
  (when battery voltage is applied to terminals 2A-1 and 2A-3)