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 Diagram Set 29 for schematic and connector information Electrical Diagrams.

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.

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 (Transmission Control Module) 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 (Transmission Control Module) 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 (Transmission Control Module) 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 (Transmission Control Module) C1750B-12, harness side and input shaft speed sensor 2 C164-1.





- If diagnosing an OSS (Output Shaft Speed) sensor concern, measure the resistance between TCM (Transmission Control Module) C1750B-9, harness side and OSS (Output Shaft Speed) sensor C193-2.





- If diagnosing an OSS (Output Shaft Speed) sensor concern, measure the resistance between TCM (Transmission Control Module) C1750B-37, harness side and OSS (Output Shaft Speed) 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.

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 (Transmission Control Module) C1750B, harness side and ground using the following chart.

TCM Ground C1750B-21 Ground C1750B-10 Ground

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

TCM Ground C1750B-12 Ground C1750B-8 Ground

- If diagnosing an OSS (Output Shaft Speed) sensor concern, measure the resistance between TCM (Transmission Control Module) C1750B, harness side and ground using the following chart.

TCM Ground C1750B-37 Ground C1750B-9 Ground

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.

C3 CHECK THE TCM (Transmission Control Module)

- Connect: TCM (Transmission Control Module) 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 (Output Shaft Speed) sensor concern, measure the voltage between OSS (Output Shaft Speed) 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. Refer to ISS or OSS (Output Shaft Speed) Test in Transmission Adaptive Learning Transmission Adaptive Learning.

No
INSTALL a new TCM (Transmission Control Module). RECONNECT all components. TEST the system for normal operation.