Toyota 2GR-FE Manual page 635

MIL Circuit
DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM.
When the ignition switch is turned on (IG), power is supplied to the MIL circuit, and the ECM provides the
circuit ground which illuminates the MIL.
The MIL operation can be checked visually: When the ignition switch is first turned on (IG), the MIL should
be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the
following troubleshooting procedure using the intelligent tester.
WIRING DIAGRAM
IG2
5
1
IG2
ST/AM2
*2 *2
5
FL MAIN
Battery
INSPECTION PROCEDURE
1
CHECK THAT MIL IS ILLUMINATED
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Combination Meter
GAUGE No. 2
13
F1
3
2
E23
Ignition SW
*2
6
AM2
IG2
AM2
(a) Perform troubleshooting in accordance with the table
below:
Result
B
4
F2
IG+
CHK
E6
Main Body ECU
*1
IG2D
11
*1
AM2
1
*1: with Smart Key System
*2: without Smart Key System
Conditions
MIL remains ON
MIL does not illuminate
Go to step 5
ES–479
ECM
24
W
A55
Proceed to
A
B
ES
A137345E01