Pinpoint Test C: Speed Sensors

Pinpoint Tests





Any time an electrical connector is disconnected, inspect the connector for terminal condition, corrosion and contamination. Also inspect the connector seal for damage. Clean, repair or install new as necessary.

Pinpoint Tests

Refer to Wiring Diagrams for schematic and connector information. Diagrams By Number

PINPOINT TEST C: SPEED SENSORS

NOTE: Perform speed sensor test prior to beginning speed sensor pinpoint tests. For additional information, refer to Transmission Adaptive Learning Transmission Adaptive Learning.

NOTE: Refer to the transaxle connector illustrations Transaxle Connector Layouts Transaxle Connector Layouts.

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C1 CHECK THE TRANSAXLE WIRING HARNESS FOR AN OPEN CIRCUIT

- Ignition OFF.
- Disconnect: Transmission Control Module (TCM) C1750B.
- Inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
- Disconnect: Input Shaft Speed Sensor 1 C143.
- Inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
- Disconnect: Input Shaft Speed Sensor 2 C164.
- Inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
- Disconnect: Output Shaft Speed (OSS) sensor C193.
- Inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
- If diagnosing an input shaft speed sensor 1 concern, measure the resistance between TCM C1750B-21, harness side and input shaft speed sensor 1 C143-2.




- If diagnosing an input shaft speed sensor 1 concern, measure the resistance between TCM C1750B-10, harness side and input shaft speed sensor 1 C143-1.




- If diagnosing an input shaft speed sensor 2 concern, measure the resistance between TCM C1750B-8, harness side and input shaft speed sensor 2 C164-2.




- If diagnosing an input shaft speed sensor 2 concern, measure the resistance between TCM C1750B-12, harness side and input shaft speed sensor 2 C164-1.




- If diagnosing an OSS sensor concern, measure the resistance between TCM C1750B-9, harness side and OSS sensor C193-2.




- If diagnosing an OSS sensor concern, measure the resistance between TCM C1750B-37, harness side and OSS sensor C193-1.




- Is the resistance less than 5 ohms?

Yes
GO to C2.

No
REPAIR the circuit(s) for an open. RECONNECT all components. TEST the system for normal operation.

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C2 CHECK THE TRANSAXLE WIRING HARNESS FOR A SHORT TO GROUND

- If diagnosing an input shaft speed sensor 1 concern, measure the resistance between TCM C1750B, harness side and ground using the following chart.





- If diagnosing an input shaft speed sensor 2 concern, measure the resistance between TCM C1750B, harness side and ground using the following chart.





- If diagnosing an OSS sensor concern, measure the resistance between TCM C1750B, harness side and ground using the following chart.





- Is the resistance greater than 10,000 ohms?

Yes
Inspect the transaxle wiring harness for signs of physical damage and repair or install a new transaxle wiring harness as necessary. TEST the system for normal operation. If the transaxle wiring harness is not damaged, GO to C3.

No
REPAIR the circuit(s) for a short to ground. RECONNECT all components. TEST the system for normal operation.

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C3 CHECK THE TCM

- Connect: TCM C1750B.
- Ignition ON.
- If diagnosing an input shaft speed sensor 1 concern, measure the voltage between input shaft speed sensor 1 C143-2, harness side and ground.




- If diagnosing an input shaft speed sensor 2 concern, measure the voltage between input shaft speed sensor 2 C164-2, harness side and ground.




- If diagnosing an OSS sensor concern, measure the voltage between OSS sensor C193-1, harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new speed sensor. RECONNECT all components. TEST the system for normal operation.

No
INSTALL a new TCM. RECONNECT all components. TEST the system for normal operation.

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