Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 351
6E–434
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1271 – APS 1– 2 Correlation Error
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
AP sensor 1
=13 % AP
sensor 2 =85
∼
89 % Wide
open throttle
AP sensor 1
=85
∼
89 %
AP sensor 2
=11
∼
15 %
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 V supply circuit
and the AP sensor signal circuit at the AP1, AP2
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. AP1and AP2 signal circuit for a short to voltage.
2. AP1and AP2 sensor ground circuit for high
resistance between the PCM and the AP sensor.
3. AP1and 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. AP1and AP2 signal circuit or 5 V supply circuit for a
poor connection.
2. AP1and AP2 signal circuit or 5 V supply circuit for
high resistance between the PCM and the AP1 and
AP2 sensor.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
—
Verify repair
Go to
Step 8
6E–435
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1271 – APS 1– 2 Correlation Error
(Cont'd)
Step
No
Yes
Value(s)
Action
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
—
6E–436
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1272 APS 2 – 3 Correlation Error
060R200064
Circuit Description
D
The accelerator position (AP) sensor circuit provides a
voltage signal relative to accelerator pedal angle.
The accelerator pedal sensor (AP2) will vary from
about 87 % at idle position to about 13 % at wide
open throttle (WOT) to specified voltage (about 5V).
This code detects a correlation error betweenAPS2
and APS3.
Conditions for setting the DTC
D
The Ignition is “ON”.
D
The acceleration pedal angle difference is more than
4.5 % between ASP2 and APS3 for more than 265
millisecond.
Action Taken When the DTC Sets
D
The PCM will not turn the malfunction indicator lamp
(MIL) “ON”.
D
The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
D
The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P1272 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.
D
DTC P1272 can be cleared using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:
D
Poor connections.
D
Misrouted harness.
D
Rubbed through wire insulation.
D
Broken wire inside the insulation.
Check for the following conditions:
D
Poor connection at PCM-Inspect harness connectors
for backed out terminals,improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
D
Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
AP sensor 2, AP sensor 3 display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P1272 cannot be duplicated, the
information included in the Failure Records data can
be useful in determined vehicle mileage since the
DTC was last set.
If it is determined that the DTC occurs intermittently,
performing the DTC
P1272 Diagnostic Chart may isolate the cause of the
fault.
6E–437
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1272 – APS 2 – 3 Correlation Error
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?
Idleposition
AP sensor 2
=86
∼
88 %
AP sensor 3
=86
∼
88 %
Wide open
throttle 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 AP sensor signal circuit at the AP2
and AP3 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 and AP3 signal circuit for a short to voltage.
2. AP2 and AP3 sensor ground circuit for high
resistance between the PCM and the AP sensor.
3. 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. AP2 and AP3 signal circuit or 5 voltage supply
circuit for a poor connection.
2. AP2 and AP3 signal circuit or 5 voltage supply
circuit for high resistance between the PCM and the
AP2 and AP3 sensor.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
—
Verify repair
Go to
Step 8
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