2010 Cadillac Truck SRX FWD V6-3.0L Page 1858
Typical Scan Tool Data
Circuit/System Description
Shift solenoid valve 1 is installed on the middle valve body. The solenoid turns ON and OFF in response to signals output from the TCM.
According to the ON or OFF status of shift solenoid valve 1 or shift solenoid valve 2, the 1st gear engine brake operates or the gear shifts into
change. As a fail-safe function, if any shift solenoid abnormality occurs, the transmission control module (TCM) will disable the current to the
solenoids.
Conditions for Running the DTC
P0985
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* 10 ms after solenoid output changed.
P0986
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* 10 ms after solenoid output changed.
Conditions for Setting the DTC
P0985
The TCM detects an ON signal (12 V) of the shift solenoid valve 1 circuit when the shift solenoid valve 1 is commanded OFF (0 V) for 100 ms
continuously after 5 times.
P0986
The TCM detects an OFF signal (0 V) of the shift solenoid valve 1 circuit when the shift solenoid valve 1 is commanded ON (12 V) for 100 ms
continuously after 5 times.
Action Taken When the DTC Sets
* DTCs P0985 and P0986 are Type A DTCs.
* The TCM freezes transmission adaptive functions.
* The TCM turns OFF all solenoids.
* The TCM allows the vehicle to operate only in the second gear and "R" range after a stop.
Conditions for Clearing the DTC
* DTCs P0985 and P0986 are Type A DTCs.
* The TCM detects an ON signal (12 V) of the shift solenoid valve 1 circuit when the shift solenoid valve 1 is commanded ON (12 V) for 1 s
continuously.
* The TCM detects an OFF signal (0 V) of the 1 circuit when the shift solenoid valve 1 is commanded OFF (0 V) for 1 s continuously.
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the control solenoid valve assembly is warmed up and the transmission is operated long
enough to ensure a 3掳C (5掳F) increase in temperature. This will place the TCM in the optimal conditions to test solenoid electrical DTCs.
