Inspection Procedure

Check voltage between terminals +B and E1 of ECM connectors.
PREPARATION:

Turn the ignition switch ON.

CHECK:

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

OK:

Voltage: 9 to 14 V

Fig 1: Identifying ECM Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Proceed to next circuit inspection shown on PROBLEM SYMPTOMS TABLE .
2. NG: Go to next step.
Check for open in harness and connector between terminal E1 of ECM 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 IGSW of ECM connector and body ground.
PREPARATION:

Turn the ignition switch ON.

CHECK:

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

OK:

Voltage: 9 to 14 V

Fig 2: Identifying ECM Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Go to step 6 .
2. NG: Go to next step.
Check IGN fuse.
PREPARATION:

Remove the IGN fuse from the cowl side J/B RH.

CHECK:

Check the continuity of the IGN fuse.

OK:

Continuity

Fig 3: Identifying IGN Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check for short in all harness and components connected to IGN fuse.
2. OK: Go to next step.
Check ignition switch (See INSPECTION ).
1. NG: Replace ignition switch.
2. OK: Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
Check voltage between terminal MREL of ECM connector and body ground.
PREPARATION:

Turn the ignition switch ON.

CHECK:

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

OK:

Voltage: 9 to 14 V

Fig 4: Identifying ECM Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) ).
2. OK: Go to next step.
Check EFI or ECD No. 1 fuse of engine room J/B.
PREPARATION:

Remove the EFI or ECD No. 1 fuse from the engine room J/B.

CHECK:

Check continuity of EFI or ECD No. 1 fuse.

OK:

Continuity

Fig 5: Identifying EFI Or ECD No 1 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check for short in all harness and components connected to EFI or ECD No. 1 fuse.
2. OK: Go to next step.
Check EFI or ECD relay (See EFI MAIN RELAY ).
1. NG: Replace EFI or ECD relay.
2. OK: Go to next step.
Check for open and short in harness and connector between terminal MREL of ECM and body ground (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Check and repair harness or connector between EFI or ECD No. 1 fuse and battery (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).