Inspection Procedure

Check voltage between terminals +B and E1 or ECM connectors.
PREPARATION:
1. Disconnect the ECM with connector from body panel (See ENGINE CONTROL MODULE (ECM) ).
2. Turn the ignition switch ON.
CHECK:

Measure the voltage between the terminals +B and E1 of the ECM connectors.

OK:
1. Voltage: 9 to 14 V
Fig 1: Locating E1 & +B Terminal of ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
2. NG : Go to Next Step.
Check for open in harness and connector between terminal E1 of ECM connector and body ground (See PROCEDURE ).
1. NG : Repair or replace harness and connector.
2. OK : Go to Next Step
Check voltage between terminal IGSW of ECM connector and body ground.
PREPARATION:
1. Disconnect the ECM with connector from body panel (See ENGINE CONTROL MODULE (ECM) ).
2. Turn the ignition switch ON.
CHECK:

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

OK:
1. Voltage: 9 to 14 V
Fig 2: Locating +B Terminals of ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Go to step 8 .
2. NG : Go to Next Step
Inspect IG2 fuse.
PREPARATION:

Remove the IG2 fuse from the FL block and J/B No. 1.

CHECK:

Measure the resistance of the IG2 fuse.

OK:
1. Below 1 Ω
Fig 3: Locating F L Block & J/B No.1's IG2 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Check for short in all harness and components connected to IG2 fuse (See attached wiring diagram).
2. OK : Go to Next Step
Check IG2 relay (See ).
1. NG : Replace IG2 relay.
2. OK : Go to Next Step
Inspect AM2 fuse.
PREPARATION:

Remove the AM2 fuse from the FL block and J/B No. 1.

CHECK:

Measure the resistance of the AM2 fuse.

OK:
1. Below 1 Ω
Fig 4: Locating F L Block & J/B No.1's AM2 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Check for short in all harness and components connected to AM2 fuse (See attached wiring diagram).
2. OK : Go to Next Step
Check ignition switch (See LOCATION ).
1. NG : Replace ignition switch.
2. OK : Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM.
8 Check voltage between terminal MREL of ECM connector and body ground.
PREPARATION:
1. Disconnect the ECM with connector from body panel (See ENGINE CONTROL MODULE (ECM) ).
2. Turn the ignition switch ON.
CHECK:

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

OK:
1. Voltage: 9- 14 V
Fig 5: Locating MREL Terminals Of ECM Connectors.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Check and replace ECM (See PROCEDURE ).
2. OK : Go to Next Step
Check EFI1 fuse (See DTC P0560 System Voltage , step 2).
1. NG : Check for short in all harness and components connected to EFI1 fuse (See attached wiring diagram).
2. OK : Go to Next Step
10 Check EFI MAIN relay (Marking: EFI) (See INSPECTION ).
1. NG : Replace EFI MAIN relay.
2. OK : Go to Next Step
11 Check for open and short in harness and connector between terminal MREL of ECM and body ground (See PROCEDURE ).
1. NG : Repair or replace harness and connector.
2. OK : Check and repair harness or connector between EFI1 fuse and battery.