Solenoid Supply/Watchdog

(P0702) SOLENOID SUPPLY/WATCHDOG





When Monitored and Set Condition
- When Monitored: Always monitored with system active at each ignition cycle.
- Set Condition: During the power up of the TOM, it tests the ability of the external watchdog to shut down the Solenoid Supply Voltage driver.

POSSIBLE CAUSES
- SOLENOID DTCS PRESENT
- SOLENOID SUPPLY CIRCUIT SHORTED TO ANOTHER CIRCUIT
- 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. SOLENOID DTCS PRESENT





With the ignition on.
With the DRB III*, read DTCs.
Are any Solenoid DTCs present?
Yes>>Repair all Solenoid DTCs before proceeding with test.
Perform NAG1 TRANSMISSION VERIFICATION TEST. Verification Tests
No>>Go To 3

3. SOLENOID SUPPLY VOLTAGE CIRCUIT SHORTED TO ANOTHER CIRCUIT





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

Note: Check connectors - Clean/repair as necessary. Check the resistance from the Solenoid Supply Voltage circuit to all other circuits at the Transmission Solenoid Assembly harness connector.

Is the resistance below 100 ohms between the Solenoid Supply Voltage circuit and any other circuit?
Yes>>Repair the Solenoid Supply Voltage circuit for a short to another circuit.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No>>Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST.