Dodge Dakota (R1). Manual — part 857

Symptom:

P1296-NO 5 VOLTS TO MAP SENSOR

When Monitored and Set Condition:

P1296-NO 5 VOLTS TO MAP SENSOR

When Monitored:

During power-down and battery voltage greater than 10.4 volts.

Set Condition:

The MAP sensor signal voltage goes below 2.35 volts with the key off for

5 seconds.

POSSIBLE CAUSES

5 VOLT SUPPLY CIRCUIT

MAP SENSOR

MAP SENSOR WIRING HARNESS INTERMITTENT PROBLEM

MAP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

PCM (5-VOLT SUPPLY)

TEST

ACTION

APPLICABILITY

1

Note: If the PO107 - MAP Sensor Voltage Too Low is also set, diagnose it first
before continuing with P1296 - No 5 Volts To MAP Sensor.
Turn the igntion on.
With the DRBIII

t in Sensors, read the MAP sensor voltage..

Is the voltage below 2.35 volts?

All

Yes

→

Go To

2

No

→

Go To

6

2

Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Measure the voltage of the 5 Volt Supply circuit at the MAP Sensor harness
connector.
Is the voltage above 4.5 volts?

All

Yes

→

Go To

3

No

→

Repair the 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

3

Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Turn the ignition on.
With the DRBIII

t in Sensors, read the MAP Sensor voltage.

Is the voltage above 4.5?

All

Yes

→

Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→

Go To

4

160

DRIVEABILITY - GAS

TEST

ACTION

APPLICABILITY

4

Turn the ignition off.
Disconnect the MAP Sensor Electrical harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the MAP Sensor 5-volt Supply Circuit for resistance to ground.
Is the resistance below 5.0 ohms?

All

Yes

→

Repair the 5-volt Supply Circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→

Go To

5

5

If there are no possible causes remaining, view repair.

All

Repair

Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

6

Start the engine.
With the DRBIII

t in Sensors, read the MAP Sensor voltage.

Wiggle MAP Sensor harness connector & wiring harness.
Monitor the DRBIII

t display.

Was there any MAP Sensor voltage change?

All

Yes

→

Repair the Harness or Connector that caused the voltage change.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→

Test Complete.

161

DRIVEABILITY - GAS

P1296-NO 5 VOLTS TO MAP SENSOR —

Continued

Symptom:

P1297-NO CHANGE IN MAP FROM START TO RUN

When Monitored and Set Condition:

P1297-NO CHANGE IN MAP FROM START TO RUN

When Monitored:

With engine RPM +/- 64 of target idle and the throttle blade at closed

throttle.

Set Condition:

Too small of a difference is seen between barometric pressure with ignition

on (engine running) and manifold vacuum for 8.80 seconds.

POSSIBLE CAUSES

MAP SENSOR TOO LOW CODE SET

MAP SENSOR WIRING HARNESS INTERMITTENT PROBLEM

VACUUM PORTS RESTRICTED

MAP SENSOR 5-VOLT SUPPLY CIRCUIT OPEN

MAP SENSOR (NO PRESS CHANGE)

MAP SENSOR (PRESS CHANGE)

MAP SENSOR RESTRICTED

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRBIII

t, read DTCs.

Is the MAP Sensor Voltage Too Low code set?

All

Yes

→

Refer to symptom P0107 MAP SENSOR VOLTS TOO LOW in the
DRIVEABILITY category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→

Go To

2

2

Turn the ignition on.
With the DRBIII

t, erase DTCs.

Start engine and allow engine to idle for 30 seconds.
With the DRBIII

t, read DTCs.

Does the DRBIII

t display No Change In MAP From Start To Run?

All

Yes

→

Go To

3

No

→

Go To

6

162

DRIVEABILITY - GAS

TEST

ACTION

APPLICABILITY

3

Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the MAP Sensor 5-Volt Supply Circuit between the MAP
Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→

Go To

4

No

→

Repair the 5-volt supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

4

Turn the ignition off.
Remove the MAP Sensor and inspect condition of vacuum port.
Inspect condition of Intake Manifold or Throttle Body vacuum port.
Was there a restriction?

All

Yes

→

Remove the restriction and reinstall the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→

Go To

5

5

If there are no possible causes remaining, view repair.

All

Repair

Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

6

Start the engine.
With the DRBIII

t, set the engine speed to 1500 RPM.

With the engine RPM at 1500, read MAP Sensor voltage.
While monitoring the voltage, wiggle the wiring from the MAP Sensor to PCM.
Did the engine stall or voltage become erratic?

All

Yes

→

Repair the Wiring or Connector defect between the MAP Sensor
and the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→

Go To

7

7

Start the engine.
While monitoring engine vacuum on the DRBIII

t display, quickly open and close

throttle several times.
Did the Vacuum drop below 1.0

9?

All

Yes

→

Test Complete.

No

→

Go To

8

8

Turn the ignition off.
Remove the MAP Sensor and inspect condition of vacuum port.
Inspect condition of Intake Manifold or Throttle Body Vacuum Port.
Is there a restriction or defect in the vacuum ports?

All

Yes

→

Repair the restricted vacuum ports.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→

Go To

9

163

DRIVEABILITY - GAS

P1297-NO CHANGE IN MAP FROM START TO RUN —

Continued