Inspection Of Diagnosis Circuit - Toyota 7M-GE Repair Manual

EFI SYSTEM
- Diagnosis System
FI-33
INSPECTION OF DIAGNOSIS .ClRCUlT
._
Fuse IGN
"CHECK ENGINE"
Fl291
1.
I
Dose "CHECK ENGINE" warning light come
on when ignition switch is at ON?
l-l
YES System Normal
Does "CHECK ENGINE" warning light come
Check wiring between
on when ECU terminal W is grounded to the
YES ECU terminal El and body
OK
Try another
body?
- ground.
__c ECU
+NO
Check bulb, fuse and wiring between ECU and
ignition switch.
+ SAD
Repair or replace
Does "CHECK ENGINE" warning light go off
when the engine is started?
YES
. System Normal
NO
Check wiring between ECU and
"CHECK ENGINE" warning light.
1 OK
Is there diagnostic code output when check
connector terminals T(MA) or TEl (MS) and
El are short circuited?
t
Check wiring between ECU terminal T and check
NO connector terminal T(MA) or TEl (MS), and ECU
* terminal El and check connector terminal El.
I
I
I
I
YES
Does "CHECK ENGINE" warning light go out NO
after repair according to malfunction code?
) Further repair required.
&
System OK
Cancel out diagnostic code.