Workshop Manual

6E–357
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
ETC passage and on the ETC position, and excessive
deposits in the throttle bore and on the throttle plate.
B Large vacuum leak – Check for a condition that causes
a large vacuum leak, such as an incorrectly installed or
faulty PCV valve or brake booster hose disconnected.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0506 – Idle Air Control System Low RPM
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 Visually/physically inspect for the following conditions:
B Throttle body tampering.
B Restricted intake throttle system. Check for a
possible collapsed air intake duct, restricted air
filter element, or foreign objects blocking the air
intake system.
B Throttle body: Check for objects blocking the
throttle passage or throttle bore, excessive
deposits in the throttle passage and on the
throttle valve, and excessive deposits in the
throttle bore and on the throttle plate.
B Throttle body with lever: Check for objects send
round the throttle spring lever that lever is smooth
movement, and spring lever has not excessive
play
Do any of the above require a repair?
—
Refer to
appropriate
section for
on–vehicle
service
Go to Step 3
3 Visually/physically inspect for the following conditions:
B Acceleration pedal tampering.
B Acceleration pedal : Check for objects blocking
the spring or pedal arm.
B Acceleration pedal : Check for objects move the
acceleration pedal that pedal is smooth
movement, and acceleration pedal arm has not
excessive play.
Do any of the above require a repair?
—
Refer to
appropriatese
ction for
on-vehicle
service
Go to Step 4
4 1. Check for a poor connection at the throttle body
harness connector.
2. Check for a poor connection at the acceleration
position sensor harness connector.
3. If a problem is found, replace faulty terminals as
necessary.
Was a problem found?
— Verify repair Go to Step 7
5 Check the following circuits for an open, short to
voltage, short to ground, or poor connection at the
PCM:
B Throttle position sensor 1 circuit.
B Throttle position sensor 2 circuit.
B Throttle DC motor circuit.
B Throttle position sensor resistance.
B Throttle DC motor resistance.
B If a problem is found, repair as necessary.
Was a problem found?
Vcc-GND
1–7kW
SIG-DND
change
resistance0.3
– 100W
Verify repair Go to Step 6