DTC P2798 / P2799
Precautions: Precautions for Diagnosing Trouble · Precautions for Disassembly and Reassembly · Precautions for Transmission / Transaxle · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P2798: Auxiliary Transmission Fluid Pump Control Circuit Low Electro magnetic oil pump solenoid valve drive circuit is shorted to ground. (1 D/C detection logic) |
•Electro magnetic oil pump solenoid valve
•Solenoid harness with ATF temperature sensor •TCM |
|
P2799: Auxiliary Transmission Fluid Pump Control Circuit High Electro magnetic oil pump solenoid valve drive circuit is open or shorted to power supply. (1 D/C detection logic) |
Circuit Diagram
| [A]: | Solenoid harness connector (View: [a]) | A2: | Electro magnetic oil pump solenoid valve ground circuit | 3. | A/T |
| [A]: | Electro magnetic oil pump solenoid valve connector (View: [a]) | 1. | TCM | 4. | Electro magnetic oil pump solenoid valve |
| A1: | Electro magnetic oil pump solenoid valve drive circuit | 2. | CPU |
DTC Confirmation Procedure
P2798
WARNING:
If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.
•Select a level road with no traffic to minimize the risk of accident.
•Perform the test extremely carefully.
•Perform the road test using 2 persons, a driver and a tester.
•Perform the test extremely carefully.
•Perform the road test using 2 persons, a driver and a tester.
NOTE:
Check that the following condition is met in this “DTC Confirmation Procedure”.
•DTC U0073 or U0100 is not detected.
1)Execute engine auto stop control.
P2799
1)Set ignition “ON” for 10 sec.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “A/T Control System Check” performed?
|
Go to Step 2.
|
Go to A/T Control System Check.
|
| 2 |
Electro magnetic oil pump solenoid valve and solenoid harness check
1)Check electro magnetic oil pump solenoid valve and solenoid harness.
Is check result OK?
|
Check for intermittent trouble.
|
Go to Step 3.
|
| 3 |
Solenoid harness check
1)Remove transaxle side oil pan.
2)Disconnect electro magnetic oil pump solenoid valve connector.
3)Check for proper terminal connections to solenoid connector and electro magnetic oil pump solenoid valve connector.
4)If connections are OK, check the following points.
•Resistance of “A1” and “A2” circuits: less than 1 Ω
•Resistance between each of “A1” and “A2” circuits and ground: infinity •Resistance between “A1” circuit terminal and other terminal at solenoid connector: infinity •Resistance between “A2” circuit terminal and other terminal at solenoid connector: infinity •Voltage of “A1” and “A2” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 4.
|
Replace solenoid harness with ATF temperature sensor.
|
| 4 |
Electro magnetic oil pump solenoid valve check
1)Check electro magnetic oil pump solenoid valve.
Is check result OK?
|
Substitute a known-good TCM and recheck DTC.
|
Replace valve body assembly.
|