Canada - Engine Controls - MIL ON/DTC P1151
Bulletin
TSB2244
Issue Date
2005-05-19
Market
Canada
Title
M.I.L. "ON" DTC P1151
Component
ENGINE ELECTRICAL
Models
'04 - '05 Prius
INTRODUCTION:
Under certain circumstances, 2004 or 2005 model year Prius vehicles may experience a M.I.L. "ON" condition with Diagnostic Trouble Code P1151, Coolant Heat Storage Tank. The Engine Control Module (ECM) (SAE term: Power Control Module/PCM) logic has been modified to prevent this condition.
NOTE:
- Updating the HV ECU as part of Special Service Campaign (SSC) 403 is a required prerequisite to fully correct the P1151 condition. Verify that SSC 403 has been performed and the HV ECU calibration is 899834708601 or higher prior to reprogramming of the Engine Control Module (ECM/PCM).
- HV ECU reprogramming is necessary only in the event that the HV ECU calibration has not been updated. The P1151 code logic is repaired when the Engine Control Module (ECM/PCM) is reprogrammed.
APPLICABLE VEHICLES:
- All 2004 model year Prius vehicles.
- 2005 model year Prius vehicles produced BEFORE the Production Change Effective VIN shown below.
PRODUCTION CHANGE INFORMATION:
WARRANTY INFORMATION:
PARTS INFORMATION:
CALIBRATION INFORMATION:
REQUIRED SSTs:
CALIBRATION CONFIRMATION:
CAUTION:
USING ANY VERSION OF THE TOYOTA DIAGNOSTIC TESTER SOFTWARE PRIOR TO VERSION 12.01a FOR REPROGRAMMING MAY RESULT IN IRREPARABLE DAMAGE TO THE ENGINE ECU (ECM/PCM) - You MUST use R040, dated 11/19/04 release, or newer! Please refer to the verification procedure in step 6 below.
Confirm the Current Engine ECU (ECM/PCM) Calibration
1. Confirm that the vehicle has undergone Pre-Delivery Service (PDS).
2. Connect the Midtronics Tester and check the condition of the 12 volt auxiliary battery. Charge if necessary before proceeding.
3. Attach the 12 volt AGM Battery Charger (P/N CXC-2815).
4. Connect the Diagnostic Tester with the CAN Interface Module to the DLC3 connector.
5. Turn on the Diagnostic Tester.
6. Press the "YES" button on the Diagnostic Tester. The number "040," or greater, should appear in the upper right-hand corner.
CAUTION:
Confirm that the correct version of the software (12.01a) and calibration update is loaded into the Diagnostic Tester, otherwise,
IRREPARABLE DAMAGE WILL OCCUR TO THE ENGINE ECU (ECM/PCM).
The date shown under "Version 12.01a" MUST be "11/19/04" or more recent.
IF NOT: STOP!!!
Update Diagnostic Tester with the newest version of software - 12.01a.
The date shown must be "11/19/04" or newer.
7. Insert key into key slot.
8. Push the "POWER" switch twice without depressing the brake pedal and confirm that the hybrid system is "IG-ON."
NOTE:
- Do NOT start the hybrid system.
- If the "READY" light is on, turn off and repeat step 7.
- Confirm that the "POWER" switch indicator is amber in colour.
9. Press the "ENTER" key on the Diagnostic Tester (after the screen is displayed and the newest version of software, 12.01a, is confirmed, as shown in step 6).
10. Select "3: ECU REPROGRAM" from the "APPLICATION SELECT" menu.
11. Select "1. ENGINE AND ECT" from the "ECU REPROGRAM SELECT SYSTEM TYPE" menu.
12. Select "2. CURRENT ECU CAL" from the "ECU REPROGRAM MAIN MENU."
13. Press the "YES "key.
14. The Diagnostic Tester is currently confirming that the CAN Interface Module has been updated. If not, the next three screens will be displayed. If the CAN Interface Module has been updated, proceed to Step 18.
15. Press the "ENTER" key.
16. The CAN Interface Module update takes approximately 3 minutes.
17. Press the "EXIT" key.
18. Confirm that the Diagnostic Tester displays one of the following calibration IDs:
- 34702200, 34702100, 34702000, or 34705000.
NOTE:
If the display shows a calibration ID of 34705100 or later, then the ENGINE ECU (ECM/PCM) has already been reprogrammed. Press the "EXIT" key and turn off the Diagnostic Tester. Proceed to Recalibration Label Installation.
19. Press the "ENTER" key to return the main menu.
REPAIR PROCEDURE:
Reprogram the Engine ECU (ECM/PCM)
1. Confirm that the auxiliary battery is fully charged using the Midtronics Battery Tester before proceeding. The Prius Automatic Charger MUST be connected during reprogramming.
CAUTION:
Do not use a jumper battery in place of the Prius Automatic Charger or IRREPARABLE DAMAGE TO THE ENGINE ECU (ECM/PCM) MAY RESULT.
2. Select "3. UPDATE ECU CAL" from the "ECU REPROGRAM MAIN MENU."
3. Select "1: IN-SERVICE ECU" from "UPDATE ECU CAL SELECT ECU TYPE" menu.
4. Confirm the following before proceeding:
- IG is "OFF." Push the "POWER" switch once without depressing brake pedal until the indicator lamp turns off.
- Engine hood is open.
- All electrical accessories are OFF (i.e., audio systems, dome lamp, navigation system, air conditioner, etc.).
- The parking brake is applied.
5. Press the "YES" key.
6. Confirm that the Diagnostic Tester displays the appropriate vehicle type. If it is not the correct vehicle, please refer to TSB 0941 "ECU Flash Reprogramming Process" to update the Diagnostic Tester.
7. Press the "ENTER" key.
8. Confirm that the Diagnostic Tester displays "34705100" or later.
NOTE:
If the Diagnostic Tester displays "YES" instead of �NO," the Engine ECU (ECM/PCM) has been reprogrammed already. Press the "EXIT" key and turn off the Diagnostic Tester. Proceed to Recalibration Label Installation.
9. Press the "ENTER" key.
10. Select the current matching calibration ID that is currently on the vehicle.
11. Press the "ENTER" key.
NOTE:
If you select the wrong calibration ID, the Diagnostic Tester will display the screen shown to the right. Please select the correct calibration ID again after pressing the "ENTER" key.
12. Push the "POWER" switch twice without depressing the brake pedal and confirm that the hybrid system is "IG-ON."
NOTE:
- Do not start the hybrid system if the "READY" light is on. You will need to turn the vehicle OFF and repeat step 12.
- Confirm that the power switch indicator is amber in colour.
13. Press the "YES" key.
NOTE:
Do not do anything that will increase an electrical load to the vehicle after pressing the "YES" key.
CAUTION:
- The progress bar will display after approximately one minute.
- It will take approximately 24 minutes to complete the reprogramming.
- During the reprogramming, do not touch the Diagnostic Tester and the cable in order to avoid reprogramming failures.
- After reprogramming, warning lights may be displayed on the dash and multi-display. DTCs may be set in the memory of various ECUs (ECMs/PCMs). This is normal and the codes must be cleared prior to release of the vehicle.
14. After approximately 24 minutes, the Diagnostic Tester will display the screen shown at right.
15. Push the "POWER" switch until the indicator lamp turns off without depressing the brake pedal.
16. Press the "ENTER" key.
17. Confirm that the Diagnostic Tester displays "34705100" (or a newer calibration) and "YES."
18. Press the "EXIT" key.
19. Push the "POWER" switch twice without the brake pedal depressed and confirm that the hybrid system is "IG-ON."
NOTE:
- Do not start the hybrid system in "READY" mode.
- Power switch indicator must be amber in colour.
20. Press the "YES" key.
21. The Diagnostic Tester is establishing communication with the Engine ECU (ECM/PCM).
22. Select "2. CURRENT ECU CAL" from the "ECU REPROGRAM MAIN MENU."
23. Confirm that the Diagnostic Tester displays the correct calibration ID:
- 34705100 (or a newer calibration).
24. Press the "ENTER" key.
25. Turn off the Diagnostic Tester.
26. Push the "POWER" switch once without depressing the brake pedal to turn ignition off.
27. Clear any DTC codes that have been set.
RECALIBRATION LABEL INSTALLATION:
1. Install the Recalibration (Authorized Modifications) Label.
A. Using a permanent marker, write the following information on the recalibration label:
- ECM (PCM) part number 89661-47101 (or newer part number).
- Calibration number 34705100 (or newer calibration).
- Dealer code.
- Repair date.
B. Install the Recalibration Label on the underside of the hood in front of the driver (see illustration).
NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.