Engine Electrical System

Diagnostic trouble code: P1651 “Malfunction in control circuit of malfunction
alarm light”
Item
No.
Operation procedure
Inspection
results
Follow-up procedure
1
Connect diagnostic tester and adaptor,
and turn the ignition switch to “ON”
position.
Proceed to next step
Yes Proceed to next step
2
Check the action of engine malfunction
alarm light by using the “actuator
action testing" function of diagnostic
tester and observe whether the light is
always on or off.
No Normal operation
Yes
Repair or replace the
wiring harness.
3
Verify that the supply circuit of engine
malfunction alarm light is open or short
to ground.
No Proceed to next step
Yes
Repair or replace the
wiring harness.
4
Check if the supply circuit between the
control terminal pin of engine
malfunction alarm light and 29# pin of
ECU is open, or is short to ground or
power supply.
No
Refer to diagnosis
help.
E-61
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