P163C

DTC P163C

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 P163C
- Glow Plug Module Primary Circuit

Diagnostic Fault Information





Circuit/System Description

The glow plug control module has the ability to perform internal diagnostics for voltage and output state of the glow plugs. The glow plug control module monitors the battery voltage of the module's main voltage supply circuit, the Ignition 1 Signal circuit and the engine control module (ECM) Control Module Voltage circuit. If the glow plug control module detects a difference between the glow plug control module main battery supply circuit and the Ignition 1 Signal circuit greater than 5 V the DTC will set or if the module detects a difference of 3 V between the glow plug control module main battery supply circuit and the ECM Control Module Voltage circuit. The glow plug control module will send a message to the ECM to set this DTC.

Conditions for Running the DTC

* The ignition is ON.
* DTC P163C runs continuously.

Conditions for Setting the DTC

The glow plug control module detects a variation between the battery positive voltage circuit to the glow plug control module, Ignition 1 signal circuit, and/or the ECM voltage circuit for 130 ms. The following conditions will set the DTC:

* Glow plug control module battery positive voltage circuit is greater than 16.5 V, and ignition 1 signal circuit is between 9-14 V.
* Glow plug control module battery positive voltage circuit is less than 6 V, and ignition 1 signal circuit is between 9-16 V.
* The difference between the glow plug control module battery positive voltage circuit, and ignition 1 signal circuit is greater than 5 V during glow plug operation.
* The difference between the glow plug control module battery positive voltage circuit and the ECM voltage circuit is greater than 3 V during glow plug operation.

Action Taken When the DTC Sets

DTC P163C is a Type B DTC.

Conditions for Clearing the DTC

DTC P163C is a Type B DTC.

Diagnostic Aids

Intermittent or poor connection of the B+ cable at the glow plug control module terminal X1 may cause this DTC to set.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15 V.

• If not within the specified range, refer to Charging System Test (Charging System Test).

2. Verify the scan tool ECM Voltage parameter reading is between 12.6-15 V.
3. Verify the scan tool glow plug control module Ignition 1 Signal parameter reading is between 12.6-15 V.
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

1. Ignition OFF, disconnect the X1 harness connector at the K34 glow plug control module.
2. Measure and record the voltage between the battery positive voltage circuit terminal 1 of the X1 harness connector and ground. The voltage should be B+.

• If voltage is not B+, repair the open or high resistance in the battery positive voltage circuit.

3. Disconnect the X2 harness connector at the K34 glow plug control module.
4. Ignition ON, measure and record the voltage between the Run/Crank Ignition 1 Voltage circuit terminal 33 of the X1 harness connector and ground. The voltage should be B+.

• If voltage is not B+, repair the open or high resistance in the Run/Crank ignition 1 voltage circuit.

5. Measure and record the voltage between the B+ and the signal ground circuit terminal 10. The voltage should be B+.

• If voltage is not B+, repair the open or high resistance in the signal ground circuit.
• If all circuits test normal, replace the K34 glow plug control module.

Repair Instructions

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

Control Module References (Programming and Relearning)for glow plug control module replacement, programming, and setup.