P0B09
DTC P0B09
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 P0B09
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Auxiliary Transmission Fluid Pump Supply Voltage Relay Control Circuit
Diagnostic Fault Information
Circuit/System Description
The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.
The transmission fluid pump - auxiliary is used to maintain transmission fluid line pressure to the transmission during Autostop mode. The transmission fluid pump - auxiliary is externally mounted to the transmission case assembly. The hybrid powertrain control module controls the auxiliary pump by providing the ground path to the transmission pump relay - auxiliary coil control circuit.
Conditions for Running the DTC
Ignition voltage is greater than 9 V.
Conditions for Setting the DTC
The generator control module detects an invalid voltage on the auxiliary transmission fluid pump relay control circuit for greater than 1 second.
Action Taken When the DTC Sets
* DTC P0B09 is a type B DTC.
* Autostop is disabled.
Conditions for Clearing the DTC
DTC P0B09 is a type B DTC.
Diagnostic Aids
Reference Information
Schematic Reference
Hybrid Controls Schematics Hybrid Controls Schematics
Description and Operation
* Generator Control Module Description and Operation Generator Control Module Description and Operation
* Hybrid Modes of Operation Description Hybrid Modes of Operation Description
* Starter Generator Description and Operation Starter Generator Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Electrical Center Identification Views Application and ID
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the auxiliary transmission fluid pump relay turns on and off/clicks when commanding the auxiliary transmission fluid pump relay ON and OFF with a scan tool.
• If the relay does not click
Refer to Circuit/System Testing.
• If the relay clicks
All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the KR86 Transmission Fluid Pump Relay - Auxiliary, Ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 86 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, test or replace the KR86 Transmission Fluid Pump Relay - Auxiliary.
• If the test lamp illuminates
3. Connect a test lamp between the ignition circuit terminal 86 and the control circuit terminal 85.
4. Verify the test lamp turns ON and OFF when commanding the Auxiliary Transmission Pump Relay ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the X2 harness connector at the K59 starter generator control module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Ignition OFF.
4. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K59 starter generator control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K59 starter generator control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K59 starter generator control module.
• If the test lamp turns ON and OFF
5. Replace the K59 starter generator control module.
Component Testing
1. Ignition OFF, disconnect the KR86 Transmission Fluid Pump Relay - Auxiliary.
2. Test for 85-130 ohms between terminals 85 and 86.
• If less than 85 ohms or greater than 130 ohms
Replace the relay.
• If between 85-130 ohms
3. Test for infinite resistance between the terminals listed below:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If less than infinite resistance
Replace the relay.
• If infinite resistance
4. Install a 3 A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground.
5. Test for less than 2 ohms between terminals 30 and 87.
• If 2 ohms or greater
Replace the relay.
• If less than 2 ohms
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness) for Transmission Fluid Pump Relay - Auxiliary replacement, Within an Electrical Center
* Control Module References Programming and Relearning for Generator Control Module, also called the Starter Generator Control Module, replacement, programming and setup.