Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P02E8: Intake Air (IA) Flow Valve Position Sensor Circuit Low VoltageDTC 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 5-volt reference circuit |
| • | The low reference circuit |
| • | The intake throttle position sensor signal circuit |
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
| • | The battery voltage is between 10-16 volts. |
| • | The ignition switch is ON for longer than 2 seconds. |
| • | DTCs P02E9, P0652 and P0653 are not set. |
P02E9
| • | The battery voltage is between 10-16 volts. |
| • | The ignition switch is ON for longer than 2 seconds. |
| • | DTCs P02E8, P0652, and P0653 are not set. |
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
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| • | Damaged components |
| • | Loose or improper installation |
Circuit/System Testing
- 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 between the applicable low reference circuit and ground.
- With the ignition ON, test for 4.8-5.2 volts between the applicable intake throttle position sensor 5-volt reference circuit and ground.
- Using a DMM, measure the voltage between the 5-volt reference circuit and a low reference circuit.
- 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 greater than 3 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the control module. |
| ⇒ | 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. |
| ⇒ | 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.
| ⇒ | 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.
| • | Intake Throttle Replacement |
| • | Control Module References for ECM replacement, setup, and programming |
