STOP AND START STOP AND START SYSTEM P0C2B11 Auxiliary Transmission Fluid Pump Control Module Feedback Signal Circuit Short to Ground
DESCRIPTION
The oil pump of the continuously variable transaxle assembly stops operating when the engine is stopped by stop and start control. While the engine is stopped by stop and start control, the oil pump with motor assembly is operated continuously ensuring optimal continuously variable transaxle oil pressure and smooth start-off when the engine is restarted.
The engine stop and start ECU supplies power to the oil pump with motor assembly via terminal OP21 and operates the oil pump with motor assembly in accordance with signals sent from terminal OPM1. The oil pump with motor assembly sends operating speed signals to the engine stop and start ECU via the NOPM signal line.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Note |
|---|---|---|---|---|---|
| P0C2B11 | Auxiliary Transmission Fluid Pump Control Module Feedback Signal Circuit Short to Ground | Both of the following conditions are met for 2 seconds or more (1 trip detection logic):
·
Oil pump motor relay circuit in the engine stop and start ECU is off ·
Oil pump with motor assembly power supply malfunction (Oil pump motor relay circuit in the engine stop and start ECU stuck on or shorted) or a short to ground in the NOPM circuit |
·
Wire harness or connector ·
Oil pump with motor assembly ·
Engine stop and start ECU |
Blinks | SAE Code: P0C2D |
CONFIRMATION DRIVING PATTERN
CONFIRMATION AFTER TROUBLESHOOTING
- HINT:
- ·
If the cable is disconnected from the auxiliary battery terminal, stop and start control is prohibited until refresh charge is completed.
In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the auxiliary battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)
·If the GTS is not available and the Data List item Status of Battery Charge Control cannot be checked, charge the auxiliary battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.
If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.
·After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.
·Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.
Clear the DTCs.
- Powertrain > Stop and Start > Clear DTCs
- 50002 392
Start the engine and warm it up.
Drive the vehicle at 7 km/h (4.3 mph) or more.
- CAUTION:
-
When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.
Depress the brake pedal and stop the vehicle.
Keep the engine stopped by stop and start control. (Keep the shift lever in D.)
Release the brake pedal with the shift lever in D to start the engine.
Check that no DTCs are output.
- Powertrain > Stop and Start > Trouble Codes
- 50001 392
STOP AND START SYSTEM OPERATION CHECK
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.
·After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).
·After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.
·Bleed the oil pump with motor assembly after replacing the continuously variable transaxle assembly or replacing the CVT fluid.
- HINT:
- ·
Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.
·DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.
PROCEDURE
Disconnect the A168 and A169 engine stop and start ECU connectors.
Disconnect the C134 oil pump with motor assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition A169-27 (NOPM) - C134-2 (OPST) Always Below 1 Ω A168-6 (OP21) - C134-4 (+B) Always Below 1 Ω A169-27 (NOPM) - Body ground and other terminals Always 10 kΩ or higher C134-2 (OPST) - Body ground and other terminals Always 10 kΩ or higher A168-6 (OP21) - Body ground and other terminals Always 10 kΩ or higher C134-4 (+B) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
| *a | Component with harness connected
(Engine Stop and Start ECU) |
- | - |
Disconnect the oil pump with motor assembly connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition A169-27 (NOPM) - A169-6 (DGND) Ignition switch ON 10 to 14 V
- Result:
Proceed to OK NG
OK
When Not Using the Engine Support Bridge:
When Using the Engine Support Bridge:
NG