Dodge Ram Truck 1500-2500-3500. Manual — part 801
P0122-THROTTLE POSITION SENSOR 1 CIRCUIT LOW (5.7L) (CONTINUED)
3.
(F855) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the Throttle Body harness connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit in the Throttle
Body harness connector.
Is the voltage between 4.8 to 5.2 volts?
Yes
>> Go To 4
No
>> Go To 7
4.
THROTTLE POSITION SENSOR
With a scan tool, monitor the TP Sensor No.1 voltage with the Sensor harness connector disconnected.
Is the voltage above 4.5 volts?
Yes
>> Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assem-
bly. 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 5
5.
(K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K22) TP Sensor
No.1 Signal circuit in the Throttle Body harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K22) TP Sensor No.1
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
9 - 126
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0122-THROTTLE POSITION SENSOR 1 CIRCUIT LOW (5.7L) (CONTINUED)
6.
(K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO THE (K922) SENSOR RETURN CIRCUIT
Measure the resistance between the (K22) TP Sensor No.1 Signal cir-
cuit and the (K922) Sensor Return circuit in the Throttle Body harness
connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K922) Sensor Return circuit
and the (K22) TP Sensor No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 9
7.
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
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 diagnostics.
Measure the resistance of the (F855) 5-volt Supply 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 8
No
>> Repair the open in the (F855) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 127
P0122-THROTTLE POSITION SENSOR 1 CIRCUIT LOW (5.7L) (CONTINUED)
8.
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (F855) 5-volt Supply
circuit in the Throttle Body 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 9
9.
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)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
10.
THROTTLE FOLLOWER TEST
With a scan tool, perform the Throttle Follower Test.
Monitor the TP Sensor No.1 voltage.
Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth transition?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assem-
bly. After installation is complete, using a scan tool select ETC RELEARN function.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 128
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0123-THROTTLE POSITION SENSOR 1 CIRCUIT HIGH (3.7L, 4.7L)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 129
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