P16AE

DTC P16AD or P16AE

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 Descriptor

DTC P16AD
- Glow Plug Control Module Temperature Sensor Circuit Low Voltage

DTC P16AE
- Glow Plug Control Module Temperature Sensor Circuit High Voltage

Circuit/System Description

The glow plug control module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. The GPCM monitors the internal temperature sensor voltage and If the voltage is less than 0.21 V or greater than 4.94 V. The GPCM will send a message to the engine control module (ECM) to set the appropriate DTC.

Conditions for Running the DTC

* Engine running.

* The DTC runs continuous when the above condition exists.

Conditions for Setting the DTC

A fault is detected when the GPCM temperature sensor voltage falls outside the calibrated threshold for greater than 1.81 seconds.

Action Taken When the DTC Sets

DTCs P16AD and P16AE are Type B DTCs.

Conditions for Clearing the DTC

DTCs P16AD and P16AE are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Glow Plug System Description Description and Operation

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.

2. Observe the DTC information with a scan tool. Verify there are no other DTCs set.

• If another DTC is set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

• If another DTC is not set

3. Replace the K34 Glow Plug Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for glow plug control module replacement, programming, and setup.