Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- Ignition OFF, disconnect PIM X1 connector.
- Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as indicated. Use the specifications for the drive motor generator that set the DTC. Also test each circuit for a short to ground.
- 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.
- Disconnect the transmission X176 24-way connector.
- Connect the DT-48493 to the X176 24-way connector at the transmission. See Special Tools .
- Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits as indicated. Use the specifications for the drive motor generator that set the DTC. Also test each circuit for a short to ground.
- 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.
- Disconnect DT-48493 from the transmission X176 24-way connector. See Special Tools .
- Connect DT-48493 to the transmission X176 24-way connector at the vehicle harness. See Special Tools .
- Disconnect PIM X1 connector.
- Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and transmission X176. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently grounded to the PIM assembly.
- 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.
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.
Drive Motor 1 Position Sensor Specification
| 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. See Special Tools . | |||
| 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 | - |
Drive Motor Position Sensor 1 PIM to Transmission Terminal Reference
| 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 |
Drive Motor 2 Position Sensor Specification
| 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. See Special Tools . | |||
| 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 | - |
Drive Motor 2 Position Sensor PIM to Transmission Terminal Reference
| 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 |