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P0850

(P0850) TRANS TEMP SENSOR - P/N SWITCH CIRCUIT





When Monitored and Set Condition
- When Monitored: Always monitored with system active at each ignition cycle.
- Set Condition: Temp sensor is open while in forward gears (1-5), temp sensor, open Temp Sensor- P/N Switch circuit, P/N Switch.

POSSIBLE CAUSES
- SHIFT LEVER ASSEMBLY ADJUSTMENT
- SENSOR GROUND CIRCUIT OPEN
- TEMP SENSOR - P/N SWITCH CIRCUIT OPEN
- TEMP SENSOR - P/N SWITCH CIRCUIT SHORTED TO GROUND
- SENSOR GROUND CIRCUIT SHORTED TO ANOTHER CIRCUIT
- TEMP SENSOR- P/N SWITCH CIRCUIT SHORTED TO ANOTHER CIRCUIT
- TEMP SENSOR - P/N SWITCH
- TRANSMISSION CONTROL MODULE

Diagnostic Test
1. PRE-DIAGNOSTIC CHECK OUT





Note: Low fluid level can be the cause of many transmission problems. If the fluid level is low, locate and repair the leak then check and adjust the fluid level in accordance with the Service Information.

Note: Always perform diagnostics with a fully charged battery to avoid false symptoms.
With the DRB III*, read the engine DTCs. Check and repair all engine DTCs prior to performing transmission symptom diagnostics.
With the DRB III*, read and record all Transmission DTCs.

Note: Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Repair as necessary.
Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run.

Note: Verify flash level of transmission controller. Some problems are corrected by software upgrades to the transmission controller.

Note: Check for any Technical Service Bulletins that may apply.

Perform this procedure prior to Symptom diagnosis.
Continue
Go To 2

2. CHECK FOR CURRENT DTC





Note: If the TCM detects and stores a DTC, the TCM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRB III* at the same time the DTC is displayed.

Note: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB III*, erase TCM DTCs.

Note: It maybe necessary to road test the vehicle for this DTC to set. With the DRB III*, read the TCM DTCs.

Did this DTC set again?
Yes>>Go To 3
No>>Go To 9

3. SENSOR GROUND CIRCUIT OPEN





Turn the ignition off.
Disconnect the TCM C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector.

Note: Check connectors - Clean/repair as necessary.

Measure the resistance of the Sensor Ground circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector.
Is the resistance above 5.0 ohms?
Yes>>Repair the Sensor Ground circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No>>Go To 4

4. TEMP SENSOR - P/N SWITCH CIRCUIT OPEN





With the ignition off.
Measure the resistance of the Temp Sensor - P/N Switch circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector.
Is the resistance below 5.0 ohms?
Yes>>Go To 5
No>>Repair the Temp Sensor - P/N Switch circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST. Verification Tests

5. TEMP SENSOR - P/N SWITCH CIRCUIT SHORT TO GROUND





With the ignition off.
Measure the resistance between ground and the Temp Sensor - P/N Switch circuit.
Is the resistance below 100 kohms?
Yes>>Repair the Temp Sensor - P/N Switch circuit for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No>>Go To 6

6. SENSOR GROUND CIRCUIT SHORT TO OTHER CIRCUITS





With the ignition off.
Disconnect the TCM C1 harness connector.

Note: Check connectors - Clean/repair as necessary. Measure the resistance from the Sensor Ground circuit to all other circuits at the TCM C1 and C2 harness connectors.

Is the resistance below 100 kohms on any of the circuits?
Yes>>Repair the Sensor Ground circuit for a short to other circuit(s).
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No>>Go To 7

7. TEMP SENSOR - P/N SWITCH CIRCUIT SHORT TO OTHER CIRCUITS





With the ignition off.
Measure the resistance from the Temp Sensor - P/N Switch circuit to all other circuits at the TCM C1 and C2 harness connectors.
Is the resistance below 100 kohms on any circuit?
Yes>>Repair the Temp Sensor - P/N Switch circuit for a short to other circuit(s).
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No>>Go To 8

8. TEMP SENSOR - P/N SWITCH





With the ignition off.
Reconnect the Transmission Solenoid Assembly harness connector.
Reconnect the TCM C1 harness connector.
With the brakes firmly applied, place the gear selector in Drive.
Measure the resistance between the Temp Sensor - P/N Switch circuit and the Sensor Ground circuit in the TCM C2 harness connector.
Is the resistance between 500 and 2500 ohms?
Yes>>Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No>>Replace the Temp Sensor - P/N Switch.
Perform NAG1 TRANSMISSION VERIFICATION TEST.

9. INTERMITTENT WIRING AND CONNECTORS
The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorts and open circuits.

Note: Check for any Technical Service Bulletins that may apply.

Were any problems found?
Yes>>Repair as necessary.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No>>Test Complete.
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