Dodge Ram Truck 1500-2500-3500. Manual — part 1027

*NO RESPONSE WITH A NO START CONDITION (CONTINUED)

2.

(F202), (F1), (T751) PCM FUSED IGNITION SWITCH CIRCUITS

Using a 12-volt test light connected to ground, probe the PCM Fused
Ignition Switch Output circuit in the appropriate terminals of special
tool #8815.

Does the test light illuminate brightly?

Yes

>> Go To 3

No

>> Repair the (F202) (F924) Ignition Switch Output circuit.

Inspect and replace fuses as necessary.

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

3.

(Z130) AND (Z131) PCM GROUND CIRCUITS

Using a 12-volt test light connected to battery voltage, probe the
(Z130) (Z131) PCM ground circuits in the appropriate terminals of spe-
cial tool #8815.

Does the test light illuminate brightly?

Yes

>> Go To 4

No

>> Repair the PCM ground circuits.

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

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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

DR/DH

*NO RESPONSE WITH A NO START CONDITION (CONTINUED)

4.

(F855) 5-VOLT SUPPLY CIRCUIT

Turn the ignition off.

Connect the PCM harness connectors.

Disconnect the Crankshaft Position Sensor harness connector.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit.

Is the voltage between 4.5 and 5.2 volts?

Yes

>> Go To 5

No

>> Go To 6

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

9 - 1031

*NO RESPONSE WITH A NO START CONDITION (CONTINUED)

5.

CKP SENSOR

Turn the ignition off.

Disconnect the TP Sensor harness connector on 3.7L and 4.7L vehi-
cles.

Disconnect the Throttle Body Harness connector on 5.7L vehicles.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit in the TP Sen-
sor or Throttle Body harness connector.

Is the voltage between 4.5 and 5.2 volts?

Yes

>> If communication is available with a PCM on a like vehicle,

replace and program the Powertrain Control Module per
Service Information.

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

No

>> Replace the Crankshaft Position Sensor.

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

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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

DR/DH

*NO RESPONSE WITH A NO START CONDITION (CONTINUED)

6.

(F855) 5-VOLT SENSOR OPEN/SHORTED

Turn the ignition off.

Disconnect the TP Sensor/Throttle Body harness connector.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit.

Disconnect all the sensors that use the (F855) 5-volt Supply circuit.

Did the voltage return to 4.5 to 5.2 volts when disconnecting
any of the sensors.

Yes

>> Replace the sensor that is pulling down the (F855) 5-volt

supply.

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

No

>> Go To 7

7.

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Disconnect C2 PCM harness connector.

Disconnect all the sensors that share the (F855) 5-volt Supply circuit.

Measure the resistance between ground and the (F855) 5-volt Supply circuit at one of the sensor harness connec-
tors.

Is the resistance below 100 ohms?

Yes

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

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

No

>> Go To 8

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

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