P2135-THROTTLE POSITION SENSOR 1/2 CORRELATION

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on and no other DTCs present for TP Sensor No.1 or No.2.
Set Condition:
PCM recognizes TP Sensors No.1 and No.2 are not coherent. One trip fault and the code will set within 5 seconds. ETC light is illuminated.

Possible Causes

(K22) TP SIGNAL 1 SHORTED TO BATTERY VOLTAGE

(K122) TP SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE

RESISTANCE IN THE (K22) TP SIGNAL 1 CIRCUIT

RESISTANCE IN THE (K122) TP SIGNAL 2 CIRCUIT

(K22) TP SIGNAL 1 CIRCUIT SHORTED TO GROUND

(K122) TP SIGNAL 2 CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (K922) SENSOR GROUND CIRCUIT

(K22) TP SIGNAL 1 CIRCUIT SHORTED TO THE (K122) TP SIGNAL 2 CIRCUIT

THROTTLE POSITION SENSOR

PCM

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

Diagnostic Test

1. ACTIVE DTC

NOTE: The throttle plate and linkage should be free from binding and carbon build up.

NOTE: Make sure the throttle plate is at the idle position.

Ignition on, engine not running.

NOTE: Inspect the engine for vacuum leaks.

With a scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

Go To 2

Go To 14

2. (K22) TP SIGNAL 1 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 (K22) TP Signal 1 circuit in the Throttle Body harness connector.

Is the voltage above 0 volts?

Yes

Repair the short to battery voltage in the (K22) TP Signal 1 circuit.

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

Go To 3

3. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE

Measure the voltage on the (K122) TP Signal 2 circuit in the Throttle Body harness connector.

Is the voltage above 0 volts?

Yes

Repair the short to battery voltage in the (K122) TP Signal 2 circuit.

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

Go To 4

4. THROTTLE POSITION SENSOR

Turn the ignition off.
Connect the C2 PCM harness connector.
Ignition on, engine not running.
With a scan tool, monitor the TP Signal 1 and Signal 2 voltage.
Connect a jumper wire between the (K922) Sensor Return circuit and the (K22) TP Signal 1 circuit.
TP Sensor No.1 voltage should change from approximately 4.5 volts to 0.5 of a volt?
For TP Sensor No.2, connect a jumper wire between (F855) 5-volt supply circuit and the (K122) TP Signal 2 circuit.
TP Sensor No.2 voltage should change from approximately 0 volts to 5.0 volts?

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

Yes

Replace the Throttle Body Assembly.

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

Go To 5
NOTE: Remove the jumper wire before continuing.

5. EXCESSIVE RESISTANCE IN THE (K22) TP SIGNAL 1 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 Signal 1 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 6

Repair the excessive resistance in the (K22) TP Signal 1 circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

6. EXCESSIVE RESISTANCE IN THE (K122) TP SIGNAL 2 CIRCUIT

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 for each circuit?

Yes

Go To 7

Repair the excessive resistance in the (K122) TP Signal 2 circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

7. (K22) TP SIGNAL 1 CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K22) TP Signal 1 circuit at the Throttle Body harness connector.

Is the resistance below 100 ohms for each circuit?

Yes

Repair the short to ground in the (K22) TP Signal 1 circuit.

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

Go To 8

8. (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 for each circuit?

Yes

Repair the short to ground in the (K122) TP Signal 2 circuit.

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

Go To 9

9. EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT

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 10

Repair the excessive resistance in the (F855) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

10. (F855) 5-VOLT SUPPLY 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

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

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

Go To 11

11. EXCESSIVE RESISTANCE IN THE (K922) SENSOR RETURN CIRCUIT

Measure the resistance of the (K922) Sensor Return 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 12

Repair the excessive resistance in the (K922) Sensor Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

12. (K22) TP SIGNAL 1 SHORTED TO (K122) TP SIGNAL 2

Measure the resistance between the (K22) TP Signal 1 circuit and the (K122) TP Signal 2 circuit at the Throttle Body harness connector.

Is the resistance below 5.0 ohms?

Yes

Repair the short between the (K122) TP Signal 2 circuit and the (K22) TP Signal 1 circuit.

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

Go To 13

13. 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)

14. THROTTLE FOLLOWER TEST

Ignition on, engine not running.
With a scan tool, perform the Throttle Follower Test and monitor the TP Sensor No.1 or No.2 voltage.
Slowly press the throttle pedal down.
The voltage for TP Sensor No.1 should start at approximately 0.8 of a volt and increase to above 4.2 volts.
The voltage for TP Sensor No.2 should start at approximately 4.2 volts and decrease to approximately 0.8 of a volt.

Is the voltage within the range of the listed specification for the appropriate Sensor?

Yes

Refer to the INTERMITTENT CONDITION Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Disconnect the Battery when replacing the Throttle Body Assembly. Replace 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)