P163D
DTC P163D
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 P163D
- Glow Plug Control Module Secondary Circuit
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The glow plug control module has the ability to perform internal diagnostics for voltage and output state of the glow plugs. If the glow plug control module receives a command to turn on the glow plugs and Ign 1 voltage is low this code will set. If the glow plug control module detects voltage on the glow plug circuits while glow plugs are not commanded on this code will set. If the glow plug control module detects a ground offset of 1.5 volts between the glow plug control module ground and the glow plug ground circuit this code will set. 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 P163D runs continuously.
Conditions for Setting the DTC
DTC will set when any of the following conditions exists:
* Glow plug control module detects 0 volts on the Ignition 1 Signal circuit while glow plugs are commanded ON for greater than 1000 ms.
* Glow plug control module detects voltage on the glow plug supply voltage circuit when glow plugs are commanded OFF for greater than 60 ms.
* Glow plug control module detects a ground offset greater than 1.5 volts between the glow plug control module Signal Ground circuit and glow plug ground circuits while the glow plugs are commanded ON for greater than 200 ms.
Action Taken When the DTC Sets
DTC P163D is a Type B DTC.
Conditions for Clearing the DTC
DTC P163D is a Type B DTC.
Diagnostic Aids
* Poor or improper connection of the glow plug control module Signal Ground circuit may cause this DTC to set.
* An open or high resistance in the Ignition 1 Signal circuit may cause the DTC to set.
* Poor connections at the battery voltage supply circuit of the glow plug control module may cause the DTC to set.
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 Glow Plug System Description
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. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 V.
• If not within the specified range, refer to Charging System Test Testing and Inspection.
2. Verify the scan tool glow plug control module Ignition 1 Signal parameter is between 12.6-15.0 V.
3. Glow plugs not commanded ON, verify the scan tool Glow Plug parameter voltage is 0.0 volts.
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. Measure and record the voltage between the Battery Positive Voltage circuit terminal X1 and ground.
• If voltage is not B+, repair the open or high resistance in the Battery Positive Voltage circuit.
2. Ignition ON, glow plugs OFF, test for 0 volts on the Glow Plug Supply Voltage 1-8 circuits.
• If greater than the specified value, disconnect the glow plug control module X1 connector and retest the Glow Plug Supply Voltage 1-8 circuits for 0 volts.
Note: If a short to voltage is indicated the appropriate glow plug(s) must be inspected for damage.
* If greater than the specified value, repair the short to voltage on the appropriate Glow Plug Supply Voltage circuit.
* If the Glow Plug Supply Voltage circuits test normal, replace the K34 glow plug control module.
3. Ignition ON, with a scan tool, verify the following scan tool parameters are less than 0.70 ohm:
* Glow Plug 1
* Glow Plug 2
* Glow Plug 3
* Glow Plug 4
* Glow Plug 5
* Glow Plug 6
* Glow Plug 7
* Glow Plug 8
• If greater than the specified value, test the appropriate Glow Plug Supply Voltage circuit for high resistance. If the circuit tests normal replace the appropriate E12 glow plug.
4. Ignition OFF, disconnect the X2 harness connector at the K34 glow plug control module.
5. Ignition ON, test for B+ between the Run/Crank Ignition 1 Voltage circuit terminal 33 and ground.
• If less than the specified value, repair the open, short to ground or high resistance in the Run/Crank Ignition 1 Voltage circuit.
6. Test for B+ between the Run/Crank Ignition 1 Voltage circuit terminal 33 and Signal Ground circuit terminal 10.
• If less than the specified value, repair the open or high resistance in the Signal Ground circuit.
7. Test for B+ between the Run/Crank Ignition 1 Voltage circuit terminal 33 and Ground circuit terminal 8.
• If less than the specified value, repair the open or high resistance in the Ground circuit.
8. 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.
* Glow Plug Replacement - Bank 1 Glow Plug Replacement - Bank 1
* Glow Plug Replacement - Bank 2 Glow Plug Replacement - Bank 2
* Control Module References Control Module References for glow plug control module replacement, setup, and programming