Dodge Ram Truck 1500-2500-3500. Manual — part 1256

P1297-NO CHANGE IN MAP FROM START TO RUN (CONTINUED)

6.

(K1) MAP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Disconnect the PCM harness connectors.

Measure the resistance between ground and the (K1) MAP Sensor
Signal circuit at the MAP Sensor harness connector.

Is the resistance below 100 ohms?

Yes

>> Repair the short to ground in the (K1) MAP Sensor Signal

circuit.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

No

>> Go To 7

7.

(K1) MAP SENSOR SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT

Measure the resistance between the (K1) MAP Sensor Signal circuit
and the (K900) Sensor ground circuit at the MAP Sensor harness con-
nector.

Is the resistance below 100 ohms?

Yes

>> Repair the short between the (K900) Sensor ground and

the (K1) MAP Sensor Signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

>> Go To 10

9 - 1946

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P1297-NO CHANGE IN MAP FROM START TO RUN (CONTINUED)

8.

(F855) 5-VOLT SUPPLY CIRCUIT OPEN

Turn the ignition off.

Disconnect the PCM harness connectors.

Measure the resistance of the (F855) 5-volt Supply circuit from the
MAP Sensor harness connector to the PCM harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 9

No

>> Repair the open in the (F855) 5-volt Supply circuit.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

9.

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (F855) 5-volt Supply
circuit at the MAP Sensor harness connector.

Is the resistance below 100 ohms?

Yes

>> Repair the short to ground in the (F855) 5-volt Supply cir-

cuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 10

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

9 - 1947

P1297-NO CHANGE IN MAP FROM START TO RUN (CONTINUED)

10.

PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.

If there are no possible causes remaining, view repair.

Repair

Replace and program the Powertrain Control Module per Service Information.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

9 - 1948

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P1388-AUTO SHUTDOWN RELAY CONTROL CIRCUIT

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

9 - 1949