Dodge Ram Truck 1500-2500-3500. Manual — part 842

P0221-THROTTLE POSITION SENSOR 2 PERFORMANCE (CONTINUED)

2.

(K122) TP SENSOR NO.2 SIGNAL CIRCUIT OR (K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO
BATTERY VOLTAGE

Turn the ignition off.

Disconnect the C2 PCM harness connector.

Disconnect the Throttle Body harness connector.

Ignition on, engine not running.

Measure the voltage on the (K122) TP No.2 Signal circuit in the Throt-
tle Body harness connector.

Measure the voltage on the (K22) TP No.1 Signal circuit in the Throttle
Body harness connector.

Is the voltage above 5.2 volts for each reading?

Yes

>> Repair the short to battery voltage in the (K122) TP Sen-

sor No.2 Signal circuit or the (K22) TP Sensor No.2 Signal
circuit.

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

No

>> Go To 3

9 - 290

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

DR/DH

P0221-THROTTLE POSITION SENSOR 2 PERFORMANCE (CONTINUED)

3.

THROTTLE POSITION SENSOR

Turn the ignition off.

Connect the C2 PCM harness connector.

Ignition on, engine not running.

With the scan tool, monitor the TP Sensor No.1 and No.2 voltage.

Connect a jumper wire between the (K922) Sensor Return circuit and
the (K22) TP Sensor No.1 Signal circuit.

NOTE: TP Sensor No.1 voltage should change from approxi-
mately 4.7 volts to 0.3 of a volt.
For TP Sensor No.2, connect a jumper wire between (F855) 5-volt
supply circuit and the (K122) TP Sensor No.2 Signal circuit.

NOTE: TP Sensor No.2 voltage should change from approxi-
mately 0 volts to 5.0 volts.

Is the voltage reading within the listed specification with the
jumper wire installed?

Yes

>> Disconnect the Battery when replacing the Throttle Body

Assembly. Replace the Throttle Body Assembly. After
installation is complete, using a scan tool, select the ETC
RELEARN function.

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

No

>> Go To 4

NOTE: Remove the jumper wire before continuing.

DR/DH

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

9 - 291

P0221-THROTTLE POSITION SENSOR 2 PERFORMANCE (CONTINUED)

4.

EXCESSIVE RESISTANCE IN THE (K22) TP SENSOR NO.1 OR (K122) TP SENSOR NO.2 SIGNAL CIRCUIT

Turn the ignition off.

Disconnect the C2 PCM harness connector.

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.
Measure the resistance of the (K22) TP Sensor No.1 Signal circuit
from the Throttle Body harness connector to the appropriate terminal
of special tool #8815. Measure the resistance of the (K122) TP Sensor
No.2 Signal circuit from the Throttle Body harness connector to the
appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms for each circuit?

Yes

>> Go To 5

No

>> Repair the excessive resistance in the (K22) TP Sensor

No.1 or (K122) TP Sensor No.2 Signal circuit.

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

9 - 292

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

DR/DH

P0221-THROTTLE POSITION SENSOR 2 PERFORMANCE (CONTINUED)

5.

(K22) TP SENSOR NO.1 OR (K122) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K122) TP Sensor
No.2 Signal circuit at the Throttle Body harness connector.

Measure the resistance between ground and the (K22) TP Sensor
No.1 Signal circuit at the Throttle Body harness connector.

Is the resistance below 100 ohms for each circuit?

Yes

>> Go To 6

No

>> Repair the short to ground in the (K122), (K22) TP Sensor

Signal circuit.

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

DR/DH

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

9 - 293