Dodge Ram Truck 1500-2500-3500. Manual - part 986

P2118-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT (CONTINUED)

THROTTLE PLATE INSPECTION

Turn the ignition off.

Remove the Air Cleaner Assembly from the Throttle Body.

Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate
to stick.

Were any signs of foreign material or scoring of the throttle plate or bore found?

Yes

>> Remove the debris if possible or replace the Throttle Body Assembly. Disconnect the Battery when

replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC
RELEARN function.

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

>> Go To 3

(K447) ETC POSITIVE CIRCUIT SHORTED TO BATTERY VOLTAGE

Turn the ignition off.

Disconnect the Throttle Body harness connector.

Disconnect the C2 PCM harness connector.

Ignition on, engine not running.

CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
With a 12-volt test light connected to ground, probe the (K447) ETC
Positive circuit at the appropriate terminal of special tool #8815.

Does the test light illuminate brightly?

Yes

>> Repair the short to battery voltage on the (K447) ETC

Positive circuit.

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

>> Go To 4

(K448) ETC NEGATIVE CIRCUIT SHORTED TO BATTERY VOLTAGE

Using a 12-volt test light connected to ground, probe the (K448) ETC
Negative circuit at the appropriate terminal of special tool #8815.

Does the test light illuminate brightly?

Yes

>> Repair the short to battery voltage in the (K448) ETC Neg-

ative circuit.

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

>> Go To 5

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

DR/DH

P2118-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT (CONTINUED)

(K447) ETC POSITIVE CIRCUIT SHORTED TO THE (K448) ETC NEGATIVE CIRCUIT

Measure the resistance between the (K447) ETC Positive circuit and
the (K448) ETC Negative circuit at the appropriate terminals of special
tool #8815.

Is the resistance below 100 ohms?

Yes

>> Repair the short to between the (K447) ETC Positive cir-

cuit and the (K448) ETC Negative circuit.

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

>> Go To 6

(K447) ETC POSITIVE CIRCUIT OPEN

Turn the ignition off.

Measure the resistance of the (K447) ETC Positive circuit from the
Throttle Body harness connector to the appropriate terminal of special
tool #8815.

Is the resistance below 5.0 ohms?

Yes

>> Go To 7

>> Repair the open in the (K447) ETC Positive circuit.

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

DR/DH

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

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P2118-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT (CONTINUED)

(K447) ETC POSITIVE CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K447) ETC Positive
circuit between the appropriate terminals of special tool #8815.

Is the resistance below 100 ohms?

Yes

>> Repair the short to ground in the (K447) ETC Positive cir-

cuit.

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

>> Go To 8

(K448) ETC NEGATIVE CIRCUIT OPEN

Measure the resistance of the (K448) ETC Negative circuit from the
Throttle Body harness connector to the appropriate terminal of special
tool #8815.

Is the resistance below 5.0 ohms?

Yes

>> Go To 9

>> Repair the open in the (K448) ETC Negative circuit.

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

P2118-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT (CONTINUED)

(K448) ETC NEGATIVE CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K448) ETC Negative
circuit between the appropriate terminals of special tool #8815.

Is the resistance below 100 ohms?

Yes

>> Repair the short to ground in the (K448) ETC Negative cir-

cuit.

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

>> Go To 10

10.

ETC MOTOR

NOTE: Take the following measurement using special tool #8815
to avoid possible damage to the Throttle Body harness connec-
tor.
Measure the resistance of the ETC Motor between the (K447) ETC
Positive circuit and the (K448) ETC Negative circuit at the appropriate
terminals of special tool #8815.

Is the resistance between 2.5 and 25 ohms at closed throttle?

Yes

>> Go To 11

>> Replace the Throttle Body Assembly. Disconnect the Bat-

tery when replacing the Throttle Body Assembly. After
installation is complete, use a scan tool and select the
ETC RELEARN function.

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

11.

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.

Were there any problems found?

Yes

>> Repair as necessary.

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

>> Replace and program the Powertrain Control Module per Service Information.

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

DR/DH

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

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