Workshop Manual

6E–445
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1280 - APS 2 Circuit Fault
Step Action Value(s) Yes No
1 Was the “On-Board (OBD) System Check” performed?
— Go to Step 2
Go to OBD
System
Check
2 Was the “Electric Throttle Control (ETC) System
Check” performed?
— Go to Step 3
Go to ETC
System
Check
3 Observe the AP angle reading on the Tech 2 while
slowly opening the throttle.
Does the AP angle increase steadily and evenly from
the closed throttle value to the wide open throttle
value?
Idle position
=86 ∼ 88
%Wide open
throttle =12
∼ 14 %
Refer to
Diagnostic
Aids
Go to Step 4
4 1. Disconnect the AP sensor.
2. Observe the AP sensor reading on the Tech 2.
Is the AP sensor reading near the specified value?
0V Go to Step 5 Go to Step 6
5 1. Connect a test light between the 5 voltage supply
circuit and the AP2 sensor signal circuit at the AP
sensor harness connector.
2. Observe the AP sensor reading on the Tech 2.
Is the AP sensor reading near the specified value?
5V Go to Step 8 Go to Step 7
6 Check the following items;
1. AP2 signal circuit for a short to volt.
2. AP2 sensor ground circuit for high resistance
between the PCM and the AP sensor.
3. AP2 sensor ground circuit for a poor connection.
4. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
— Verify repair Go to Step 9
7 Check the following items;
1. AP2 signal circuit or 5 volt supply circuit for a poor
connection.
2. AP2 signal circuit or 5 volt supply circuit for high
resistance between the PCM and the AP2 sensor.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
— Verify repair Go to Step 9
8 Replace the AP sensor.
Is the action complete?
— Verify repair —
9 Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to
ON-Vehicle Service in Power
Control Module and Sensors for procedures.
And also refer to latest Service Bulletin. Check to see
if the latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
— Verify repair —