Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 1415
6E2–111
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Electric Throttle Control (ETC) System Check
060R200065
6E2–112
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Circuit Description
D
The powertrain control module (PCM) controls
engine speed by adjusting the position of the throttle
control valve (DC motor). The throttle motor is a DC
motor driven by one coil. The PCM applies current to
the DC motor coil in PWM (%) to adjust the throttle
valve into a passage in the throttle body to allow air
flow. This method allows highly accurate control of
engine speed and quick response to changes in
engine load.
D
The acceleration position (AP1) sensor circuit
provides a voltage signal relative to acceleration
pedal angle.
The acceleration pedal angle will vary about 13% at
idle position to about 87% at wide open
throttle(WOT).
APS signal is used to determine which DC motor will
adjust throttle position.
After the APS signal has been processed by the
PCM, it will command DC motor to allow movement of
throttle position.
Diagnostic Aids
D
An intermittent may be caused by a poor connection,
rubbed-through wire insulation or a wire broken inside
the insulation. Check for poor connections or a
damaged harness. Inspect the PCM harness and
connector for improper mating, broken locks,
improperly formed or damaged terminals, poor
terminal-to-wire connection, and damaged harness.
D
Throttle body – Check for objects blocking the DC
motor or throttle bore, excessive deposits in the ETC
passage and on the valve spring, and excessive
deposits in the throttle bore and on the throttle valve
plate.
D
Acceleration pedal – Check for objects blocking the
AP sensor or pedal arm with spring, excessive
deposits in the acceleration pedal arm and on the
acceleration pedal and lacking the pedal stopper
rabber.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
2. Visually/physically inspect for the following throttle
valve conditions.
3. Visually/physically inspect for the following
acceleration pedal conditions.
5. Check the following circuits for throttle valve and DC
moter. Check the following TP sensor resistance
and DC motor.
6. Check the following circuits for acceleration pedal.
Check the following AP sensor resistance.
7. Following DTC: Error for ETC system.
6E2–113
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Electric Throttle Control (ETC) System Check
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
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?
—
Refer to
appropriate
section for
on-vehicle
service
Go to
Step 3
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?
—
Refer to
appropriate
section 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 5
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?
TPS, DC
mortor 1–7k
W
TPS, DC
mortor
change
resistance
0.3–100
W
Verify repair
Go to
Step 6
6E2–114
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Electric Throttle Control (ETC) System Check
(Cont'd)
Step
No
Yes
Value(s)
Action
6
Check the following circuits for an open, short to
voltage, short to ground, or poor connection at the
PCM:
D
Acceleration position sensor 1 circuit.
D
Acceleration position sensor 2 circuit.
D
Acceleration position sensor 3 circuit.
D
Acceleration position sensor resistance.
If a problem is found, repair as necessary.
Was the prblem found?
Vcc–GND
AP1 2.6–4k
W
AP2 2.6–4k
W
AP3
4.2–6.4k
W
Verify repair
Go to
Step 7
7
Following below the DTCs stored: P1120, P1220,
P1220, P1221, P1271, P1272, P1273, P1275, P1280,
P1285, P1514, P1515, P1516, P1523
—
Go to
applicable
DTC table
Go to
Step 8
8
1. Install the Tech 2
2. Ignition “ON” but not engine run.
3. Check the value for APS and TPS.
Was a problem found?
Idle AP1 =
11
∼
15% AP2
= 85
∼
89%
AP3 =
85
∼
89% TP1
= 8
∼
13% TP2
= 8
∼
13%
WOT AP1 =
85
∼
89% AP2
= 11
∼
15%
AP3 =
32
∼
36% TP1
= 87
∼
97%
TP2 =
87
∼
97%
Go to
Step 9
System O.K.
9
1. Replace the faulty sensor.
2. Re–check the value for APS and TPS Refer to the
procedure in step 8.
Was the problem found?
—
Go to
Step 10
Verify repair
10
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to
On–Vehicle Service in
Powertrain Control Module and Sensors for
Procedures.
And also refer to letest Service Bulletin.
Check to see if the Latest software is releasec or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
—
Verify repair
—
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст