Buick Regal: DTC P16D7-P16D9
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 P16D7
Sensor Bus Relay Control Circuit
DTC P16D8
Sensor Bus Relay Control Circuit Low
DTC P16D9
Sensor Bus Relay Control Circuit High
Diagnostic Fault Information
Engine Controls Ignition Relay
Circuit/System Description
There is 1 Sensor Supply Voltage Relay Feedback circuit supplied to the K111
Fuel Pump Driver
Control Module from the K20 Engine Control Module.
Conditions for Running the DTC
P16D7
- The sensor bus relay is commanded ON.
- Battery supply signal voltage is less than 11 V.
- The DTC runs continuously when the above conditions are met.
P16D8
- The sensor bus relay is commanded ON.
- Battery supply signal voltage is less than 11 V.
- The DTC runs continuously when the above conditions are met.
P16D9
- The sensor bus relay is commanded OFF.
- Battery supply signal voltage is greater than 11 V.
- The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
Control Circuit=Commanded state does not match the actual state for greater
than 1 s
Action Taken When the DTC Sets
DTCs P16D7, P16D8 and P16D9 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P16D7, P16D8 and P16D9 are Type B DTCs.
Diagnostic Aids
The sensor bus relay may also be labeled the sensor supply voltage relay,
sensor bus relay control
circuit, or sensor supply voltage feedback circuit.
Reference Information
Schematic Reference
- Engine Controls Wiring Schematics (LGX)
- Power Distribution Wiring Schematics
Connector End View Reference
Component Connector End View Index
Component View Reference
Powertrain Component Views
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Electrical Center Identification Views
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool DTC information. Verify DTC P16D7,
P16D8, or P16D9 is not
set.
- If any of the DTCs are set
Refer to Circuit/System Testing.
- Go to next step: If none of the DTCs are set
2. Operate the vehicle within the Conditions for Running the DTC. You may
also operate the vehicle
within the conditions that you observed from the Freeze Frame/Failure Records
data.
Refer to Circuit/System Testing.
- Go to next step: If the DTC does not set
3. All OK.
Circuit/System Testing
1. Ignition/Vehicle & All vehicle systems - Off.
2. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module.
3. Verify a test lamp does not turn On between the test points:Control circuit
terminal 2 & B+
terminal 7.
- If the test lamp turns On
- Remove - Test Lamp
- Disconnect the electrical connector:X3@
Verify a test lamp does not turn On between the test points: Control circuit
terminal 2 & B+
terminal 7
- If the test lamp turns On - Repair the short to ground on the
circuit.
- Replace the component: - K20 Engine Control Module
- Go to next step: If the test lamp does not turn On
4. Ignition - On / Vehicle - In Service Mode.
5. Verify a test lamp does not turn On between the test points: Control circuit
terminal 2 & Ground
terminal 22.
- If the test lamp turns On
- Remove - Test Lamp
- Disconnect the electrical connector:X3@K20 Engine Control Module
- Verify a test lamp does not turn On between the test points:Control
circuit terminal 2 &
Ground terminal 22
- If the test lamp turns On - Repair the short to voltage on the
circuit.
- If the test lamp does not turn On - Replace the component:K20 Engine
Control
Module
- Go to next step: If the test lamp does not turn On
6. Verify a test lamp turns On between the test points: Control circuit
terminal 2 & B+ terminal 7
- If the test lamp does not turn On
- Disconnect the electrical connector:X3@K20 Engine Control Module
- Test for less than 2 ohms between the test points:Control circuit
terminal 2@K111 Fuel
Pump Driver Control Module & Control circuit terminal 3 X3@K20 Engine
Control
Module
- If 2 ohms or greater - Repair the open/high resistance in the
circuit.
- If less than 2 ohms - Replace the component:K20 Engine Control
Module
- Go to next step: If the test lamp turns On
7. Replace the component: - K111 Fuel Pump Driver Control Module
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Engine Wiring Harness Junction Block Replacement (LTG) or Engine Wiring
Harness Junction Block Replacement (LGX).
- Relay Replacement (Attached to Wire Harness) or Relay Replacement
(Within an Electrical
Center)
- Control Module References for engine control module replacement,
programming, and setup.
READ NEXT:
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.
Diag
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.
Diagnosti
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.
Diag
SEE MORE:
According to accident statistics,
children and infants are safer when
properly restrained in an appropriate
child restraint secured in a rear
seating position.
Whenever possible, children aged
12 and under should be secured in
a rear seating position.
Never put a rear-facing child
restraint in the
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Diagnostic
System Check - Vehicle
Review the description of Strategy Based Diagnosis:Strategy Based
Diagnosis
An overview of each diagnostic category can be found here: Diagnostic
Procedu