Dodge Neon / Neon SRT-4. Manual — part 589

Symptom:

P1187-THOTTLE INLET PRESSURE/MAP CORRELATION

When Monitored and Set Condition:

P1187-THOTTLE INLET PRESSURE/MAP CORRELATION

When Monitored:

Igntion on.

Set Condition:

The PCM compares the MAP and TIP sensor with the ignition on. If the

sensors are not close in value a failure is recorded. The MAP and TIP should be within the
the range of 56kPa and 112 kPa with the ignition on. Two trip failure.

POSSIBLE CAUSES

COMPARING MAP AND TIP SENSORS

CHECKING FOR OTHER DTCS

CHECKING THE HOSES AND TUBING

(A23) TIP SIGNAL CIRCUIT OPEN

(K167) SENSOR GROUND CIRCUIT OPEN

SOLENOID TEST #1

SOLENOID TEST #2

SOLENOID TEST #3

SOLENOID TEST #4

THROTTLE INLET PRESSURE SENSOR

CHECKING VACUUM PASSAGE

(K7) 5 VOLT SUPPLY CIRCUIT

MAP SENSOR INTERNAL OPEN

(K1) MAP SIGNAL CIRCUIT OPEN

(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

PCM

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
Using the DRBIII

t, monitor both the MAP and TIP kPa.

NOTE: The MAP and TIP should both be within the range of 56 kPa to 112
kPa.
Are either MAP or TIP out of range.

All

Yes

→ Go To 2

No

→ Refer to the INTERMITTENT CONDITION symptom in the

Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

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TEST

ACTION

APPLICABILITY

2

Turn the ignition on.
With the DRBIII

t, read the PCM DTCs.

NOTE: If there are any other MAP Sensor or Throttle Inlet Pressure Sensor
DTCs present, repair the other MAP Sensor or Throttle Inlet Pressure
Sensors before continuing.
Does the DRB display any other DTCs?

All

Yes

→ Refer to the symptom list and perform the appropriate diagnostic

procedure.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Go To 3

3

Select the Sensor that was not within range (56 kPa - 112 kPa).

All

TIP SENSOR

Go To

4

MAP SENSOR

Go To

11

4

Before continuing this test, visually inspect the TIP sensor connector for any damage
or corrosion. Repair as necessary.
NOTE: The exhaust system must be free from any restriction to perform this
test.
Check all of the tubes and hoses between the air cleaner and the intake manifold for
loose connection, damage or restriction.
Check all of the tubes connected to the intercooler for loose connection, damage or
restriction.
Check all of the tubes and hoses connected to the turbocharger, TIP Solenoid, Surge
Solenoid and Wastegate Solenoid for loose connection, damage or restriction.
NOTE: Solenoid design and hose connections are identical for all three
solenoids. It is possible to connect the hoses to the incorrect solenoid. Verify
that hoses are connected to the correct solenoid.
Are any of these conditions evident?

All

Yes

→ Repair or replace as necessary.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Go To 5

5

Turn the ignition off.
Disconnect the TIP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (A23) TIP Signal circuit from the TIP Sensor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 6

No

→ Repair the open in the (A23) TIP Signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

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P1187-THOTTLE INLET PRESSURE/MAP CORRELATION —

Continued

TEST

ACTION

APPLICABILITY

6

Turn the ignition off.
Disconnect the TIP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K167) Sensor ground circuit from the TIP Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 7

No

→ Repair the open in the (K167) Sensor ground circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

7

Turn the ignition off.
Disconnect the hoses from the TIP Solenoid.
Install a plug on the TIP Solenoid hose B connection point.
Connect a vacuum pump to the TIP Solenoid hose A connection point.
With vacuum pump apply 20 inches of vacuum to the TIP Solenoid hose A connection
point.
NOTE: Vacuum reading should not drop below 10 inches within 5 seconds.
Does vacuum read above 10 inches for at least 5 seconds?

All

Yes

→ Go To 8

No

→ Replace the TIP Solenoid.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

8

Turn the ignition off.
Disconnect the hoses from the TIP Solenoid.
Install a plug on the TIP Solenoid hose C connection point.
Connect a vacuum pump to the TIP Solenoid hose A connection point.
Attempt to apply 20 inches of vacuum to the TIP Solenoid hose A connection point.
NOTE: Vacuum should escape through the Solenoid hose B connection
point.
Does vacuum escape through the Solenoid hose B connection point?

All

Yes

→ Go To 9

No

→ Replace the TIP Solenoid.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

9

Turn the ignition off.
Disconnect the hoses from the TIP Solenoid.
Install a plug on TIP Solenoid hose C connection point.
Connect a vacuum pump to the TIP Solenoid hose B connection point.
NOTE: For the result of this test to be accurate the solenoid must be turned
on. Apply 12 volts and Ground to the appropriate solenoid terminals to turn
the solenoid on.
With vacuum pump apply 20 inches of vacuum to the TIP Solenoid hose B connection
point.
NOTE: Vacuum reading should not drop below 10 inches within 5 seconds.
Does vacuum read above 10 inches for at least 5 seconds?

All

Yes

→ Go To 10

No

→ Replace the TIP Solenoid.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

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P1187-THOTTLE INLET PRESSURE/MAP CORRELATION —

Continued

TEST

ACTION

APPLICABILITY

10

Turn the ignition off.
Disconnect the hoses from the TIP Solenoid.
Install a plug on the TIP Solenoid hose A connection point.
Connect a vacuum pump to the TIP Solenoid hose B connection point.
NOTE: For the result of this test to be accurate the solenoid must be turned
on. Apply 12 volts and Ground to the appropriate solenoid terminals to turn
the solenoid on.
Attempt to apply 20 inches of vacuum to the TIP Solenoid hose B connection point.
NOTE: Vacuum should escape through the Solenoid hose C connection
point.
Does vacuum escape through the Solenoid hose C connection point?

All

Yes

→ Replace the Throttle Inlet Pressure Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Replace the TIP Solenoid.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

11

Before continuing this test, visually inspect the MAP sensor connector for any
damage or corrosion. Repair as necessary.
NOTE: The exhaust system must be free from any restriction to perform this
test.
Turn the ignition off.
Remove the MAP Sensor.
Visually inspect the vacuum passages on both the intake side and component. Ensure
that it is free from any blockage.
Was any blockage found?

All

Yes

→ Repair or replace as necessary.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Go To 12

12

Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the (K7) 5 Volt Supply circuit in the MAP Sensor harness
connector.
Is the voltage between 4.5 to 5.2 volts?

All

Yes

→ Go To 13

No

→ Repair the 5 Volt Supply circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

13

Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
With the DRBIII

t, monitor the MAP Sensor voltage.

Is the voltage above 4.5 volts?

All

Yes

→ Go To 14

No

→ Go To 15

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P1187-THOTTLE INLET PRESSURE/MAP CORRELATION —

Continued