Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 362

6E–478

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

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.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.

3. Determines if the PCM is able to control the EVAP

purge solenoid valve.

4. Determines if the DTC will set under the conditions

present when the DTC was originally stored. If not,
the fault is intermittent.

5. Checks for a grounded EVAP purge solenoid driver

circuit, a faulty EVAP vacuum switch, or a leaking
EVAP purge solenoid valve.

DTC P1441 – EVAP System Flow During Non-Purge

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to

Step 2

Go to

OBD

System

Check

1. Ignition “OFF”.
2. Remove the fuel filler cap.
3. Ignition “ON”.
4. Observe “Fuel Tank Pressure” on the Tech 2.

Is “Fuel Tank Pressure” at the specified value?

1.51V

Go to

Step 3

Go to

DTC

P0452 or

P0453

1. Re-install the fuel filler cap.
2. Using the Tech 2, command the EVAP Vent

Solenoid Valve “ON” (Closed).

3. Disconnect the canister side rubber hose end that

hose is connected between the Purge Solenoid
Valve and Canister.

IMPORTANT: Before continuing with the diagnosis,
zero the EVAP pressure/purge cart J41413 (refer to the
tool operating instructions).
And them monitor the fuel tank inner pressure using the
Tech 2.

Does the fuel tank pressure remain the specified
value?

1.52 - 1.60V

Go to

Step 4

Go to

Step 6

1. Disconnect the EVAP pressure/purge cart J41413,

and then plug the hose end.

2. Disconnect the rubber hose end of engine vacuum

source side, (the hose connected between Purge
Solenoid Valve and engine).

3. Connect the vacuum hand pump to this rubber hose

end.

4. Then apply the -15 in H2O vacuum by the vacuum

pump.

5. Monitor the fuel tank inner pressure using the Tech

Does the fuel tank inner pressure hold the specified
value?

1.47 - 1.51V

Go to

Step 6

Go to

Step 5

Replace the Purge Solenoid Valve.

—

Verify Repair

—

6E–479

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1441 – EVAP System Flow During Non-Purge

(Cont'd)

Step

Yes

Value(s)

Action

1. Check leaks, kinks or pinched hoses at the EVAP

system rubber hose line, and also check if the
rubber hoses are correctly connected or not.

2. Check for a leak from Vent Solenoid Valve and

EVAP system rubber hoses, and also check for
clogged Filter of air separator which is located near
the vent solenoid valve.

Was a problem found? Using the Vacuum Hose
Routing Diagram, repair or re-connect the rubber
hoses correctly.

—

Verify Repair

Go to

Step 7

1. Start engine.
2. Remove the Fuel Filler cap.
3. Using the Tech 2, command the EVAP Vent

Solenoid Valve “ON” (closed) and Purge Solenoid
Valve “OFF” (0%).

4. Replace the Fuel Filler Cap.
5. Run the engine at 2500RPM constant while

monitoring “Fuel Tank Vacuum” on the Tech 2.

Does the fuel tank vacuum remain at the specified
value while the EVAP Vent Solenoid Valve “ON”
(closed) and Purge Solenoid Valve “OFF” (0%)?

30 - 40 %

Verify Repair

Go to

Diagnostic

Aids

6E–480

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P1514 TPS - MAF Correlation Error

060R200061

Circuit Description

The throttle position (TP) sensor circuit provides a
voltage signal relative to throttle blade angle.
The throttle blade angle will vary from about 8 % at
closed throttle to about 92 % at wide open throttle
(WOT).

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 quantity of air entering the engine indicates
an accelerator 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

The engine is running.

No MAF sensor DTCs are set.

Throttle actuation mode is not off.

MAF reading-ETC estimated air flow is less than 40g/s
for 250 failures within test 1000 test samples (15.6 m
sec).

Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.

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

The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault conditions is no longer present.

A history DTC P1514 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

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:

Poor connections.

Misrouted harness.

Rubbed through wire insulation.

Broken wire inside the insulation.

Check for the following conditions:

Poor connection at PCM - Inspect harness connectors
for backed out terminals, improper mating, broken

6E–481

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

locks, improperly formed or damaged terminals, and
poor terminal to wire connection.

Damaged harness - Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Mass Air Flow, TP sensor 1, TP sensor 2 display on the
Tech 2 while moving connectors and wiring harnesses
related to the sensor.

Plugged intake air duct or filter element

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 Failure Records data can
be useful in determining 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

Was the “On-Board (OBD) System Check” performed?

—

Go to

Step 2

Go to

OBD

System

Check

Was the “Electric Throttle Control (ETC) System
Check” performed?

—

Go to

Step 3

Go to

ETC

System

Check

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

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?

∼

10 g/s

Go to

Step 5

Go to

Step 8

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

Replace the MAF sensor.

Is the action complete?

—

Verify repair

Go to

Step 9

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 19

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 the
specified value?

∼

10 g/s

Go to

Step 6

Go to

Step 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?

65kPa

Go to

Step 10

Go to

Step 13

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