Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 1506
6E2–475
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1514 TPS - MAF Correlation Error
060R200061
Circuit Description
D
The throttle position (TP) sensor circuit provides a
voltage signal relative to throttle blade angle.
The throttle blade angle will vary about 8 % at closed
throttle to about 92 % at wide open throttle (WOT).
D
The mass air flow (MAF) sensor measures the amount
of air which passes through it into the engine during a
given time. The powertrain Control Module (PCM)
uses the mass air flow information to monitor engine
operating conditions for fuel delivery calculations.
A large quantitiy of air entering the engine indicates
an accleration or high load situation, while a small
quantity or air indicates deceleration or idle.
The MAF sensor produces a frequency signal which
can be monitored using a Tech 2. The frequency will
vary within a range of around 4 to 7g/s at idle to
around 25 to 40g/s at maximum engine load.
Conditions for setting the DTC
D
The engine is running.
D
No MAF sensor DTCs are set.
D
Throttle actuation mode is not off.
D
MAF reading-ETC estimated air flow is less than 40g/s
for 250 failres within test 1000 test samples (15.6 m
sec).
Action Taken When the DTC Sets
D
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
D
The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.
D
The PCM will store condition which were present when
the DTC was set as Freeze Frame and in the Failure
Records 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 condtion is no longer present.
D
A history DTC P1514 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.
D
DTC P1514 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 connectons.
D
Mis routed 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
6E2–476
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Mass Air Flow, TP sensor 1, TP sensor 2 display on the
Tech 2 while moving connectors and wiring harnesses
related to the sensor.
D
Plugged intake air duct or filter element
D
A wide - open throttle acceleration from a stop should
cause the mass air flow displayed on a Tech 2 to
increase from about 3 – 6 g/s at idle to 100 g/s or
greater at the time of the 1 – 2 shift. If not, check for a
restriction.
A change in the display will indicate the location of
the fault. If DTC P1514 cannot be duplicated, the
information included in the Faillure 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 P1514 Diagnostic Chart may
isolate the cause of the fault.
DTC P1514 - TPS-MAF 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
1. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor “DTC” info for DTC P1514.
Does the Tech 2 indicate DTC P1514 failed this
ignition?
—
Go to
Step 4
Refer to
Diagnostic
Aids
4
1. Start the engine.
2. With the engine idling, monitor “MAF Frequency”
display on the Tech 2.
Is the “MAF Frequency” below the specified value?
4
∼
7 g/s
Go to
Step 5
Go to
Step 8
5
1. Ignition “OFF.”
2. Disconnect the MAF sensor connector.
3. Ignition “ON,” engine idling.
4. Using a Tech 2, monitor “MAF Frequency.”
Does the Tech 2 indicate a “MAF Frequency” at the
specified value?
0g/s
Go to
Step 6
Go to
Step 7
6
Replace the MAF sensor.
Is the action complete?
—
Verify repair
—
7
1. Check the MAF harness for incorrect routing near
high voltage components (solenoids, relays,
motors).
2. If incorrect routing is found, correct the harness
routing.
Was a problem found?
—
Verify repair
Go to
Step 8
8
1. With the engine idling, monitor “MAF Frequency.”
display on the Tech 2.
2. Quickly snap open throttle to wide open throttle
while under a road load and record value.
Does the Tech 2 indicate a “MAF Frequency” at
thespecified value?
4
∼
7 g/s
Go to
Step 6
Go to
Step 9
9
1. Ignition“ON”, engine not running.
2. Observe the MAP reading on the Tech 2.
Is the MAP reading less than the specified value?
100kPa
Go to
Step 10
Go to
Step 13
6E2–477
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1514 - TPS-MAF Correlation Error
(Cont'd)
Step
No
Yes
Value(s)
Action
10
1. Disconnect the MAP sensor.
2. Connect a test 5 volt reference circuit and the MAP
signal at the MAP sensor harness connector.
3. Observe the MAP reading on the Tech 2.
Is the MAP reading less than the specified value? (If no,
start with diagnosis chart for other sensors in the circuit
and see if 5Vreturns.)
5V
Go to
Step 11
Go to
Step 18
11
1. Check the MAP signal circuit between the PCM and
MAP ground circuit.
2. If the MAP signal circuit is open or shoted, repair it
as necessary.
Was the MAP signal circuit open or shorted?
—
Verify repair
Go to
Step 12
12
Replace the MAP sensor.
Is the action complete?
—
Verify repair
—
13
Observe the TP angle reading on the Tech 2 while
slowly opening the throttle.
Does the TP angle increase steadily and evenly from
the closed throttle value to the wide open throttle
value?
Closed
throttle TP
sensor 1 =
8
∼
13% TP
sensor 2 =
8
∼
13% Wide
open throttle
TP sensor 1
= 87
∼
97% TP
sensor 2 =
87
∼
97%
Go to
Step 18
Go to
Step 14
14
1. Connect a DVM between the 5Volt reference circuit
and the TP1 and TP2 sensor ground circuit at the
TP sensor harness connector.
2. Observe the voltage using a DVM.
Is the voltage near the specified value?
5V
Go to
Step 15
Go to
Step 18
15
Check the following items;
1. TP1 and TP2 signal circuit for a short to voltage.
2. TP1 and TP2 sensor ground circuit for high
resistance between the PCM and the TP sensor.
3. TP1 and TP2 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 16
16
Check the following items;
1. TP1and TP2 signal circuit or 5 volt reference circuit
for a poor connection.
2. TP1 and TP2 signal circuit or 5 volt reference circuit
for high resistance between the PCM and the
TP1and TP2 sensor.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
—
Verify repair
Go to
Step 17
6E2–478
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1514 - TPS-MAF Correlation Error
(Cont'd)
Step
No
Yes
Value(s)
Action
17
Replace the TP sensor.
Was a problem corrected?
—
Verify repair
Go to
Step 18
18
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 replasement PCM.
Is the action complete?
—
Verify repair
—
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст