DTC Advanced Diagnostics: P0989
DTC P0989:Transmission Fluid Pressure Switch E (6th Clutch) Circuit Low

General Description


Transmission fluid pressure switch E (6th clutch) is installed in the hydraulic pressure circuit to the 6th clutch. When hydraulic pressure is supplied to the 6th clutch, the switch is turned on. When hydraulic pressure is not supplied to the 6th clutch, the switch is turned off. The signal from transmission fluid pressure switch E (6th clutch) is input to the powertrain control module (PCM). The PCM detects the hydraulic pressure supply conditions at the gear change to 6th gear (5th ? 6th) to reduce the shock that occurs at the gear change. If transmission fluid pressure switch E (6th clutch) is on while driving the vehicle with the rotation speed ratio of the input/output pulses is other than the 6th gear ratio (the ratio is Neutral or 5th), the PCM detects a transmission fluid pressure switch E (6th clutch) failure and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
Depending on the driving conditions
DTC Type
Two drive cycles, MIL on, A/T gear position indicator blinks
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
Minimum
Maximum
Battery voltage
[BATTERY VOLTAGE]
11 V
–
No active DTCs set (prevents monitor from running)
P0122, P0123, P0222, P0223, P0705, P0716, P0717, P0718, P0721, P0722, P0723, P0746, P0747, P0751, P0752, P0756, P0757, P0761, P0762, P0776, P0777, P0796, P0797, P0842, P0843, P0847, P0848, P0872, P0873, P0877, P0878, P0962, P0963, P0966, P0967, P0970, P0971, P0973, P0974, P0976, P0977, P0979, P0980, P0990, P1658, P1659, P1683, P1684, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176, P2714, P2720, P2721
[ ]: HDS Parameter

Malfunction Threshold
One of these conditions occurs:
The input signal from transmission fluid pressure switch E (6th clutch) [6th Pressure Switch] to the PCM is low for at least 4 seconds when the shift lever is in P, R, or N.
The input signal from transmission fluid pressure switch E (6th clutch) [6th Pressure Switch] to the PCM is low for at least 4 seconds when driving in 1st, 2nd, or 3rd gear.
The input signal from transmission fluid pressure switch E (6th clutch) [6th Pressure Switch] to the PCM is low for at least 4 seconds when the 3rd gear shift is commanded or when the shift lever is in P, R, or N, after the signal is low for at least 2 seconds when driving in 4th or 5th gear.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Transmission fluid pressure switch E (6th clutch) OP6SW line short to ground
Transmission fluid pressure switch E (6th clutch) stuck on
PCM internal circuit failure

Confirmation Procedure
Operating Condition
1.
Start the engine.
2.
Drive the vehicle in D until the transmission shifts into 6th gear.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on, the A/T gear position indicator blinks, and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The A/T gear position indicator comes off by pressing the engine start/stop button to select the OFF mode. The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.