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P16A1




DTC P16A0-P16A2

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC P16A0
- Sensor Communication Circuit Low Voltage

DTC P16A1
- Sensor Communication Circuit High Voltage

DTC P16A2
- Sensor Communication Circuit Performance

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The throttle body is a normally open valve and is only operated during a DPF regeneration. The throttle body contains a digital position sensor. The position sensor is mounted within the throttle body and is not serviceable. The position sensor provides a signal voltage that changes relative to throttle body valve angle. The engine control module (ECM) supplies the throttle body with a 5 V reference circuit , a low reference circuit, and a serial data circuit or position sensor signal. The position sensor information is transmitted between the throttle body and the ECM on the serial data circuit.

Conditions for Running the DTCs

* The engine is operating for greater than 10 s.
* The engine speed is greater than 600 RPM.
* DTCs P16A0, P16A1, and P16A2 run continuously once the above conditions are met.

Conditions for Setting the DTC

P16A0

The ECM detects the position sensor signal voltage is less than 1.45 V for greater than 5 s.

P16A1

The ECM detects the position sensor signal voltage is greater than 3 V for greater than 5 s.

P16A2

The ECM detects noise on the position sensor signal circuit for greater than 8 s.

Action Taken When the DTC Sets

DTCs P16A0, P16A1, and P16A2 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P16A0, P16A1, and P16A2 are Type B DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Control Module References) for scan tool information

Circuit/System Verification

1. Ignition ON, verify that DTC P0697 is not set.

• If a DTC is set, refer to DTC P0641, P0651, P0697, P06A3, P06D2, or P06D6 (P0641) for further diagnosis.

2. Engine idling, observe the scan tool IAF Valve Pos. Sensor voltage parameter. The reading should be between 3.7-4.7 V.
3. Observe the DTC information with a scan tool. Verify DTC P16A0, P16A1, or P16A2 are not set.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: Disconnecting the throttle body harness connector causes additional DTCs to set.

1. Ignition OFF, disconnect the harness connector at the throttle body.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the low reference circuit terminal 4 or D and ground.

• If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 5 or E and ground.

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Test for 3.1-4.1 V between the signal circuit terminal 3 or C and ground.

• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuits tests normal, replace the K20 ECM.

5. If all circuits test normal, test or replace the throttle body.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

* Throttle Body Assembly Replacement (Service and Repair)
* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable (Diesel Particulate Filter (DPF) Regeneration Enable) procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration) procedure.
* Control Module References (Control Module References) for ECM replacement, programming, and setup

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