• | 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. |
The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM monitors the angular position, speed and direction of the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor, or resolver, 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 MCM 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 MCM then monitors the two driven coil circuits for a return signal. The position of the irregular shaped metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coil signals allows the MCM to determine the exact position, speed and direction of the drive motor generator.
Offset is the relationship between the position sensor and the drive motor generator output shaft. When the ignition turned OFF, the MCM attempts to learn the offset of the drive motor position sensor.
• | The ignition is cycled OFF. |
• | Drive motor generator speed is less than 20 RPM. |
The position sensor offset exceeds 25 degrees during the learning process.
• | DTCs P0C4E and P0C4F are Type C DTCs. |
• | The MCM uses the last learned valid position sensor offset. |
DTCs P0C4E and P0C4F are Type C DTCs.
• | The drive motor generator position sensor circuits operate at very low current. Extreme care must be taken when probing terminals and manipulating harnesses. |
• | The sensor circuit loops are twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are grounded to a stud on the drive motor generator power inverter module (PIM) assembly. |
• | Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing. |
DT-48493 Jumper Harness
Note: The drive motor generator position sensor circuits require proper circuit integrity for correct system operation. Just a few ohms of additional circuit resistance may cause position sensor signal degradation.
• Always inspect position sensor signal connectors for proper terminal contact. • All diagnostic connections must be made with the approved test probes to prevent the creation of poor terminal contact. • Connectors that contain position sensor signal circuits must always be clean and dry prior to mating. Foreign material or moisture within the connector may cause sensor signal degradation.
⇒ | If any of the circuits are not within specification, continue with testing. |
⇒ | If all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, replace the applicable drive motor generator assembly. |
⇒ | If all circuits test normal, continue with testing. |
⇒ | If any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission harness tests OK, replace the applicable drive motor generator. |
⇒ | If any of the circuits are not within the specified range, repair or replace the wiring harness. |
⇒ | If all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK, inspect the harness for an intermittent concern. |
When Testing at PIM X1 56-way Connector/Terminal | When Testing at Transmission X176 24-way Connector/Terminal | Minimum Resistance | Maximum Resistance |
---|---|---|---|
Use the DT-48493 when testing at X176 | |||
55-56 | 8-9 | 7 ohms | 9 ohms |
53-54 | 10-11 | 23 ohms | 26 ohms |
51-52 | 12-14 | 20 ohms | 23 ohms |
52-56 | 8-12 | Over 1 M ohm | -- |
54-56 | 8-10 | Over 1 M ohm | -- |
52-54 | 10-12 | Over 1 M ohm | -- |
PIM Connector X1 56-Way Connector/Terminal | Transmission X176 24-Way Connector/Terminal | Minimum Resistance | Maximum Resistance |
---|---|---|---|
Harness Continuity Test | |||
56 | 8 | -- | less than 1 ohm |
55 | 9 | -- | less than 1 ohm |
54 | 10 | -- | less than 1 ohm |
53 | 11 | -- | less than 1 ohm |
52 | 12 | -- | less than 1 ohm |
51 | 14 | -- | less than 1 ohm |
When Testing at PIM X1 56-way Connector/Terminal | When Testing at Transmission X176 24-way Connector/Terminal | Minimum Resistance | Maximum Resistance |
---|---|---|---|
Test at DT-48493 connected to transmission | |||
48-49 | 15-16 | 7 ohms | 9 ohms |
46-47 | 17-18 | 23 ohms | 26 ohms |
44-45 | 20-21 | 20 ohms | 23 ohms |
45-49 | 15-20 | Over 1 M ohm | -- |
47-49 | 15-17 | Over 1 M ohm | -- |
45-47 | 17-20 | Over 1 M ohm | -- |
PIM X1 56-way Connector/Terminal | Transmission X176 24-way Connector/Terminal | Minimum Resistance | Maximum Resistance |
---|---|---|---|
Harness Continuity Test | |||
49 | 15 | -- | less than 1 ohm |
48 | 16 | -- | less than 1 ohm |
47 | 17 | -- | less than 1 ohm |
46 | 18 | -- | less than 1 ohm |
45 | 20 | -- | less than 1 ohm |
44 | 21 | -- | less than 1 ohm |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.