P0222-THROTTLE POSITION SENSOR 2 CIRCUIT LOW





For a complete Engine wiring diagram Refer to Section 8W.



Possible Causes
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K122) TP SIGNAL 2 CIRCUIT SHORTED TO GROUND
(K122) TP SIGNAL 2 CIRCUIT SHORTED TO THE (K922) TP RETURN CIRCUIT
THROTTLE POSITION SENSOR/THROTTLE BODY
THROTTLE PLATE JAMMED AGAINST THE MAXIMUM STOP
PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. TP SENSOR NO.2 BELOW 0.35 OF A VOLT

NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode.

NOTE: If a 5-Volt supply DTC has also set, diagnose the 5-Volt DTC before continuing.

NOTE: Make sure the throttle moves freely and does not hang up at Wide Open Throttle, by performing the Throttle Follower Test

NOTE: If P2101 is also set, then make sure that the blade moves freely and does not hang up near Wide Open Throttle before trying to repair P0222.


Ignition on, engine not running.
With the scan tool, read the TP Sensor voltage.

Is the voltage below 0.35 of a volt?

Yes


No

2. P0122 ALSO SET


Was the P0122-TP SENSOR NO.1 VOLTAGE LOW DTC set along with the P0222?

Yes


No

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 4.5 to 5.2 volts?

Yes


No

4. THROTTLE POSITION SENSOR



Connect a jumper wire between the (F855) 5-volt Supply circuit and the (K122) TP Signal 2 circuit in the Throttle Body harness connector.
With the scan tool, monitor the TP Sensor No.2 voltage.

Is the voltage between 4.8 and 5.2 volts with the jumper wire installed?

Yes


No

5. (K122) TP SIGNAL 2 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 diagnosis.


Measure the resistance of the (K122) TP Signal 2 circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes


No

6. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO GROUND



Measure the resistance between ground and the (K122) TP Signal 2 circuit at the Throttle Body harness connector.

Is the resistance below 100 ohms?

Yes


No

7. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO THE (K922) TP RETURN CIRCUIT



Measure the resistance between the (K122) TP Signal 2 circuit and the (K922) TP Return circuit at the Throttle Body harness connector.

Is the resistance below 100 ohms?

Yes


No

8. (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 diagnosis.


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


No

9. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND



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

Is the resistance below 100 ohms?

Yes


No

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.

Were there any problems found?

Yes


No

11. THROTTLE FOLLOWER TEST

Ignition on, engine not running.
With the scan tool, perform the Throttle Follower Test.
Monitor the TP Sensor No.2 voltage while slowly pressing the Throttle pedal down.

Is there a smooth voltage change from high to low?

Yes


No