Workshop Manual

6E–449
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1290 - ETC Forced Idle Mode
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 Tech2 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
AP sensor 1
=12 ∼ 14 %
AP sensor 2,
3 =86 ∼ 88 %
Wide open
throttle AP
sensor 1 =86
∼ 88 % AP
sensor 2 =12
∼ 14 % AP
sensor 3 =32
∼ 36 %
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 AP1, AP2 and AP3 sensor signal
circuit at the AP sensor harness connector.
2. Observe the AP sensor reading on the Tech2.
Is the AP sensor reading near the specified value?
5V Go to Step 8 Go to Step 7
6 Check the following items;
1. AP1,AP2 and AP3 signal circuit for a short to
voltage.
2. AP1, AP2 and AP3 sensor ground circuit for high
resistance between the PCM and the AP sensor.
3. AP1, AP2 and AP3 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. AP1, AP2 and AP3 signal circuit or 5 volt supply
circuit for a poor connection.
2. AP1, AP2 and AP3 signal circuit or 5 volt supply
circuit for high resistance between the PCM and the
AP1, AP2 and AP3 sensor.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
— Verify repair Go to Step 9