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P0C5C




DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03

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 P0A3F

-
Drive Motor Position Sensor Circuit

DTC P0A40

-
Drive Motor Position Sensor Performance

DTC P0C52

-
Drive Motor Position Sensor Circuit 1 Low Voltage

DTC P0C53

-
Drive Motor Position Sensor Circuit 1 High Voltage

DTC P0C5C

-
Drive Motor Position Sensor Circuit 2 Low Voltage

DTC P0C5D

-
Drive Motor Position Sensor Circuit 2 High Voltage

DTC P1B03

-
Drive Motor Position Sensor Circuit Tracking Lost

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 generator control module monitors the angular position, speed and direction of the starter generator rotor based upon the signals of the resolver-type motor 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 starter generator.

At ignition ON, an AC voltage, 10 kHz excitation signal is output to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The generator 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 generator control module to determine the exact position, speed and direction of the starter generator rotor. The position sensor is a non-serviceable part of the starter generator.

Conditions for Running the DTC

* Ignition voltage is greater than 9.5V.

* The drive motor control module and hybrid powertrain control module are awake.

Conditions for Setting the DTC

P0A3F

Sin or Cos signal is less than 2.3V.

P0A40

Sin or Cos signal is greater than 4V.

P0C52

Drive Motor Position Sensor Circuit 1 reference voltage is less than 0.5 V.

P0C53

Drive Motor Position Sensor Circuit 1 reference voltage is greater than 4.5 V.

P0C5C

Drive Motor Position Sensor Circuit 2 reference voltage is less than 0.5 V.

P0C5D

Drive Motor Position Sensor Circuit 2 reference voltage is greater than 4.5 V.

P1B03

The generator control module tracking error is greater than 5 degrees.

Action Taken When the DTC Sets

* DTCs P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, and P1B03 are Type B DTCs.

* Starter generator operation is disabled.

* Autostop operation is disabled.

* Autostart operation is disabled.

* APM remains active until hybrid battery power is depleted, or APM power limits are exceeded, after which the high voltage contactor's relay is opened.

Conditions for Clearing the DTC

DTCs P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, and P1B03 are Type B DTCs.

Diagnostic Aids

* The starter generator position sensor circuits operate at very low current. These circuits are susceptible to moisture intrusion, coolant contamination, corrosion, and terminal damage. Extreme care must be taken when removing the starter generator, probing terminals and manipulating harnesses. Poor terminal connections can result in intermittent operation.

* If the customer comments that the problem occurs only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the sensor wiring and seals for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:

1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons (12 g) of salt to 8 fl oz (237 ml) of water and wait 10 minutes.

2. Test drive the vehicle at various speeds over various road surfaces such as bumps and turns.

3. Rinse the area thoroughly when completed.

* The sensor circuit loops are a twisted pair with each pair covered in a grounded foil shield.

* The starter generator position sensor harness circuits are shielded. Improperly grounded shield circuits may cause inaccurate sensor signals.

Reference Information

Schematic Reference

Hybrid Controls Schematics Hybrid Controls Schematics

Connector End View Reference

* Component Connector End Views Connector End Views By Name

* Inline Harness Connector End Views Connector End Views By Number

Description and Operation

* Starter Generator Description and Operation Starter Generator 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

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 Testing

Note:
You must perform the Component Testing before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the X1 harness connector at the A15 starter generator.

2. Ignition ON, test for 1.7-3.2 V between the harness terminals listed below and ground:

* Terminal 1

* Terminal 2

* Terminal 5

* Terminal 6

• If not within the specified range

Test the signal circuits for a short to voltage, short to ground or an open/high resistance. If all circuits test normal replace the K59 starter generator control module.

• If the test passed

3. Ignition ON, test for 6.5-8.5 V between the harness terminals listed below and ground:

* Terminal 3

* Terminal 4

• If not within the specified range

Test the signal circuits for a short to voltage, short to ground or an open/high resistance. If all circuits test normal replace the K59 starter generator control module.

Component Testing

Note:
If moist environmental conditions: rain, snow, vehicle wash, etc. are present please refer to the appropriate Diagnostic Aids section above before doing component tests.

1. Ignition OFF, disconnect the X1 harness connector at the A15 starter generator.

2. At the A15 starter generator, test for 10-35 ohms between the A15 starter generator AC terminal 3 and the AC terminal 4.

• If not within the specified range

Replace the A15 starter generator.

• If the test passed

3. Test for 30-60 ohms between the signal terminal 1 and the signal terminal 5.

• If not within the specified range

Replace the A15 starter generator.

• If the test passed

4. Test for 30-60 ohms between the signal terminal 2 and the signal terminal 6.

• If not within the specified range

Replace the A15 starter generator.

• If the test passed

5. Test for greater than 10,000 ohms between the terminals listed below and A15 starter generator case:

* X1 Terminal 1

* X1 Terminal 2

* X1 Terminal 3

* X1 Terminal 4

* X1 Terminal 5

* X1 Terminal 6

• If less that the specified value

Replace the A15 starter generator.

• If the test passed

6. Test for infinite resistance between the terminals listed below:

* X1 Terminals 1 and 3

* X1 Terminals 1 and 2

* X1 Terminals 4 and 6

• If less that the specified value

Replace the A15 starter generator.

• If infinite

Refer to Circuit/System Testing.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Starter Generator Replacement Starter Generator Replacement

* Control Module References Programming and Relearning for Generator Control Module, also called the Starter Generator Control Module, replacement, programming and setup.

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