Diagnostic Instructions

DTC Descriptors

DTC P02E8: Intake Air (IA) Flow Valve Position Sensor Circuit Low Voltage

DTC P02E9: Intake Air (IA) Flow Valve Position Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open	Short to Voltage
Intake Throttle Position Sensor 5-Volt Reference	P0652	P02E8	--
Intake Throttle Position Sensor Signal	P02E8	P02E8	P02E9
Intake Throttle Position Sensor GND	--	P02E9	--

Circuit/System Description

The intake throttle position sensor is installed on the intake throttle valve body together with the control solenoid. The intake throttle position sensor changes output voltage according to intake throttle valve position. The sensor has the following circuits:

The intake throttle position sensor provides a signal to the ECM on the signal circuit, which is relative to the position changes of the intake throttle valve.

Conditions for Running the DTC

P02E8

P02E9

Conditions for Setting the DTC

P02E8

The ECM detects that the intake throttle position sensor signal voltage is less than 0.1 volt.

P02E9

The ECM detects that the intake throttle position sensor signal voltage is more than 4.9 volts.

Action Taken When the DTC Sets

DTCs P02E8 and P02E9 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P02E8 and P02E9 are Type A DTCs.

Diagnostic Aids

Inspect for any recent engine mechanical repairs. An incorrectly installed intake throttle valve will cause this DTC to set.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Circuit/System Verification

Verify the integrity of the intake throttle system by inspecting for the following conditions:

Circuit/System Testing

1. With the ignition OFF, disconnect the harness connector at the intake throttle position sensor. Allow at least 60 seconds for the ECM to power down. Test for less than 3 ohms of resistance between the applicable low reference circuit and ground.

⇒	If greater than 3 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the control module.

2. With the ignition ON, test for 4.8-5.2 volts between the applicable intake throttle position sensor 5-volt reference circuit and ground.

⇒	If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.

⇒	If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.

3. Using a DMM, measure the voltage between the 5-volt reference circuit and a low reference circuit.

⇒	If less than 4.8 volts, test the low reference circuit for an open circuit.

Important: If a short to voltage is found, the position sensor will also need to be replaced.

4. Install a 3-amp fused jumper wire between the applicable signal circuit and the applicable 5-volt reference circuit. Verify that the scan tool intake throttle position sensor parameter is less than 60 percent.

⇒	If more than 80 percent, test the applicable signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.

⇒	If less than 30 percent, test the applicable signal circuit for a short to voltage and replace the intake throttle valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.