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DI-409
DIAGNOSTICS - ENGINE (1GR-FE)
DIDUE-01
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and
the EFI relay control circuit in the ECM sends a signal to terminal MREL of the ECM switching on the EFI
relay.
This signal causes current to flow to the coil, closing the contacts of the EFI relay and supplying power to
terminal +B of the ECM.
WIRING DIAGRAM
I23 Drive Side J/B ECM
J66
Ignition Switch
J/C
4 IGN 11 9
B-R B-O B-O
1I 1F E3 IGSW
7 AM2 IG2 6 H H
W-R
J/C
9 26 8
B-R GR-G GR-G
J26 J27 E3 MREL
8 IA9
W-R
1
W-L
E3 +B
2 2 2 2
2 2 5 1
EFI 1
AM2
No. 1
EFI 21 J27 E5 E1
1 1 Relay
J/C
3 2 4 J26
2 2 2 BR
Engine Room R/B
W-B
A W-L
B W-L J18
J/C J1
A J/C
W-B
B B
Battery EA EU
A23576
DI-410
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
1 Check voltage between terminals +B and E1 of ECM connector.
PREPARATION:
Turn the ignition switch to ON.
E5 E3 CHECK:
Measure the voltage between terminals +B and E1 of the ECM
connectors.
OK:
Standard: 9 to 14 V
E1 (-) +B (+)
B17411 OK Proceed to next circuit inspection shown in the
Problem symptoms table (See page DI-33).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN-30).
NG Repair or replace harness or connector.
OK
3 Check voltage between terminal IGSW of ECM connector and body ground.
PREPARATION:
Turn the ignition switch to ON.
E3 CHECK:
Measure the voltage between terminal IGSW of the ECM con-
nector and body ground.
OK:
Standard: 9 to 14 V
IGSW (+)
B17411 OK Go to step 6.
NG
DI-411
DIAGNOSTICS - ENGINE (1GR-FE)
4 Check IGN fuse.
Driver Side J/B: PREPARATION:
Remove the IGN fuse from the instrument panel J/B.
CHECK:
Check the resistance of the IGN fuse.
OK:
Below 1
IGN NG Check for short in all harness and components
A23469
connected to IGN fuse, and replace the fuse.
OK
5 Check ignition switch (See page BE-37).
NG Replace ignition switch.
OK
Check and repair harness and connector be-
tween battery and ignition switch, and igni-
tion switch and ECM.
6 Check voltage between terminal MREL of ECM connector and body ground.
PREPARATION:
Turn the ignition switch to ON.
E3 CHECK:
Measure the voltage between terminal MREL of the ECM con-
nector and body ground.
OK:
Standard: 9 to 14 V
MREL(+)
B17411 NG Replace ECM (See page SF-66).
OK
DI-412
DIAGNOSTICS - ENGINE (1GR-FE)
7 Check EFI No. 1 fuse of engine room J/B.
Engine Room J/B: PREPARATION:
Remove the EFI No. 1 fuse from the engine room J/B.
CHECK:
Check resistance of EFI No. 1 fuse.
OK:
Below 1
EFI
NG Check for short in all harness and components
No. 1 Fuse
A23509
connected to EFI No. 1 fuse, and replace the
fuse.
OK
8 Check EFI relay).
PREPARATION:
EFI Relay
Remove the EFI relay from the engine room J/B.
CHECK:
Inspect the EFI relay.
OK:
Standard:
Terminal No. Condition Specified Condition
3-5 Always 10 K or higher
A19288
Apply B+ between
3-5 Below 1
terminals 1 and 2
NG Replace EFI relay.
OK
9 Check for open and short in harness and connector between terminal MREL of
ECM and body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
DI-413
DIAGNOSTICS - ENGINE (1GR-FE)
Check and repair harness or connector be-
tween EFI No. 1 fuse and battery.
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