Inspection Procedure

Check voltage between terminals + B and E1 of ECM connector.
PREPARATION:
1. Remove the ECM hood (See ENGINE CONTROL MODULE (ECM) ).
2. Turn the ignition switch ON.
CHECK:

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

OK:
1. Voltage: 9 to 14 V
Fig 1: Checking Voltage Between Terminals +B & E1 Of ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Proceed to next circuit inspection shown in the Problem symptoms table (See PROBLEM SYMPTOMS ).
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 CHART AND INSPECTION PROCEDURE ).
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:
1. Remove the ECM hood (See ENGINE CONTROL MODULE (ECM) ).
2. Turn the ignition switch ON.
CHECK:

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

OK:
1. Voltage: 9 to 14 V
Fig 2: Checking Voltage Between Terminal IGSW Of ECM Connector And Body Ground
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 driver side J/B.

CHECK:

Check the continuity of the IGN fuse.

OK:
1. Continuity
Fig 3: Identifying Location Of 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 IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH ).
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 CHART AND INSPECTION PROCEDURE ).
Check voltage between terminal MREL of ECM connector and body ground.
PREPARATION:
1. Remove the ECM hood (See ENGINE CONTROL MODULE (ECM) ).
2. Turn the ignition switch ON.
CHECK:

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

OK:
1. Voltage: 9 to 14 V
Fig 4: Checking Voltage Between MREL Connector & Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) ).
2. OK: Go To Next Step.
Check EFI fuse of engine room No. 1 R/B.
1. NG: Check for short in all harness and components connected to EFI fuse.
2. OK: Go To Next Step.
Check EFI main relay (Marking: EFI) (See EFI MAIN RELAY ).
1. NG: Replace EFI main relay.
2. OK: Go To Next Step.
Check for open and short in harness and connector between terminal M-REL of ECM and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair or replace harness or connector.
2. OK: Check and repair harness or connector between EFI fuse and battery (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).