P1B10

DTC P1B0F or P1B10

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 Descriptors
DTC P1B0F
- Drive Motor 1 Position Learn Incorrect

DTC P1B10
- Drive Motor 2 Position Learn Incorrect

Circuit/System Description

The drive motor generator position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed and direction of the drive motor generator rotor based upon the signals of the resolver-type position sensor. The position sensor contains a drive coil, two driven coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At ignition ON, the motor control module outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The motor control module then monitors the two driven coil circuits for a return signal. The position of the irregular metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coils signals allows the motor control module to determine the exact position, speed and direction of the drive motor generator rotor. The position sensor is a non-serviceable part of the drive motor generator.

A measurement called offset is needed for accurate determination of the motor position. Offset is the relationship between the position sensor and the drive motor generator output shaft. Whenever the ignition is cycled to OFF, the motor control module attempts to learn the offset of the drive motor position sensor by rapidly oscillating the motor and observing the position sensor signals.

Conditions for Running the DTC

Condition 1, 2, 3 and 4
* Hybrid wake-up signal is not active because the ignition has been transitioned from RUN to OFF.
* The motor control module has learned a valid drive motor position sensor offset value at least once.

Condition 2

Motor speed is less than 20 RPM.

Conditions for Setting the DTC

Condition 1

Position sensor offset value not learned because drive motor speed is greater than 50 RPM.

Condition 2

Position sensor offset value not learned because hybrid battery voltage as observed at the motor control module is less than 192V.

Condition 3

Position sensor offset value not learned because drive motor phase to phase current difference is less than 15 A.

Condition 4

Position sensor offset value not learned because the offset learn value is greater than the maximum allowed offset of 25 degrees.

Action Taken When the DTC Sets

* DTCs P1B10 and P1B0F are Type C DTCs.
* The motor control module operates the drive motor generator using the last valid learned offset.

Conditions for Clearing the DTC

* DTCs P1B10 and P1B0F are Type C DTCs.
* High voltage remains enabled immediately following an ignition key transition from RUN to OFF.

Reference Information
Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, verify that DTCs P0A40, P0A45, P0A46, P0A78, P0A79, P0A3F, P0C05, P0C08, P0C0B, P0C0E, P0C4E, P0C4F, P0C52, P0C53, P0C57, P0C58, P0C61, P0C62, P0C5C, P0C5D, P1B03, P1B04 or P1B0D is not set.

• If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Ignition ON, engine OFF, observe the scan tool battery energy control module contactor system status parameter. The status should display closed.

• If not the specified value, refer to Symptoms - Hybrid Controls Symptoms - Hybrid Controls.

3. Cycle the ignition OFF for 2 minutes, ON for 2 minutes then OFF for at least 10 seconds.
4. Ignition ON, Verify that DTCs P1B10 or P1B0F is not set.

• If the DTC is set, program the T6 drive motor generator power inverter module. If the DTC resets, replace the appropriate M15 drive motor with generator assembly.

Repair Instructions

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

* Drive Motor with Generator Assembly Removal - 1st Position 8. Drive Motor with Generator Assembly Removal - 1st Position
* Drive Motor with Generator Assembly Removal - 2nd Position 13. Drive Motor with Generator Assembly Removal - 2nd Position
* Control Module References Control Module References for Drive Motor Generator Power Inverter Module replacement, setup and programming.