OBD II Scan Tool (Excluding Hand-Held Tester):

Check operation of FUEL PUMP ).
1. OK: Go to step 7 .
2. NG: Go to next step.
Check operation of FUEL PUMP RELAY .
1. NG: Replace fuel pump relay.
2. OK: Go to next step.
Check FUEL PUMP .
1. NG: Repair or replace fuel pump.
2. OK: Go to next step.
Check CIRCUIT OPENING RELAY .
1. NG: Replace circuit opening relay.
2. OK: Go to next step.
Check for open in harness and connector between EFI or ECD relay and fuel pump, and fuel pump and body ground (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check voltage between terminal FC of ECM connector and body ground.
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure the voltage between terminal FC of the ECM connector and body ground.

OK:

Voltage: 9 to 14 V

Fig 1: Identifying ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check for open in harness and connector between battery and FC terminal of ECM (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
2. OK: Proceed to PROBLEM SYMPTOMS TABLE .
Check fuel pump resistor (See INSPECTION ).
1. NG: Replace fuel pump resistor.
2. OK: Check for open in harness and connector between circuit opening relay and fuel pump resistor, fuel pump resistor and fuel pump (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).