Isuzu 2000 Trooper Workshop Manual page 981

6E–112
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Electric Throttle Control (ETC) System Check
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Visually/physically inspect for the following conditions:
D
Throttle body tampering.
D
Restricted intake throttle system. Check for a
possible collapsed air intake duct, restricted air
filter element, or foreign objects blocking the air
intake system.
D
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.
D
Throttle body with lever: When check for objects
to send round the throttle spring lever that lever is
smooth movement by less than 9 l·bm{1.0 N·m},
and spring lever has not excessive play.
D
Throttle function: Check for the throttle function.
When ignition switch "ON" that throttle lever is
smooth operated by step on the acceleration
pedal.
Did any of the above require a repair?
3 Visually/physically inspect for the following conditions:
D
Acceleration pedal tampering.
D
Acceleration pedal : Check for objects blocking
the spring or pedal arm.
D
Acceleration pedal : For check for objects to move
the acceleration pedal that pedal is smooth
movement, and acceleration pedal arm has not
excessive play.
Did any of the above require a repair?
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?
5 Check the following circuits for an open, short to
voltage, short to ground, or poor connection at the
PCM:
D
Throttle position sensor 1 circuit.
D
Throttle position sensor 2 circuit.
D
Throttle DC motor circuit.
D
Throttle position sensor resistance.
D
Throttle DC motor resistance.
If a problem is found, repair as necessary.
Was a problem found?
Action Value(s) Yes
— Go to Step 2
Refer to
appropriate
section for
on-vehicle
— service
Refer to
appropriate
section for
on-vehicle
service
—
— Verify repair
Vcc–GND
1–7km
SIG–GND
change
resistance
0.3–100m Verify repair
No
Go to OBD
System
Check
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6