Engine Controls/Fuel Sys - Hard Start/Long Crank Time
06-013October 22, 2011
Applies To:
2004 TL - From VIN19UUA6...4A000001 thru 19UUA6...4A058862
Long Crank Time or Hard Starting
(Supersedes 06-013, dated July 23, 2011, to update the information marked by the black bars and asterisks)
REVISION SUMMARY
*Under WARRANTY CLAIM INFORMATION, a flat rate time was changed.*
SYMPTOM
There is excessive cranking or the engine is hard to start.
PROBABLE CAUSE
There are two possible causes:
1. Contamination in the fuel pressure regulator causes the regulator to stick or intermittently stick, which causes a delay in fuel pressure at start-up.
2. Exhaust gas backflow into the intake manifold at engine shutdown may cause a poor mixture of intake air and fuel at the next engine start-up.
CORRECTIVE ACTION
*Replace the fuel pressure regulator, if needed, and use the HDS to update the PGM-FI software in the ECM/PCM.*
NOTE:
Vehicles with VIN 19UUA6...4A041208 thru 19UUA6...4A058862 already have an improved fuel pressure regulator. For these vehicles, skip DIAGNOSIS, and go to step 10 of REPAIR PROCEDURE to update the PGM-FI software in the ECM/PCM.
PARTS INFORMATION
Fuel Pressure Regulator Kit: P/N 17052-SEP-A00
(The kit includes the regulator, the gasket, and the locknut.)
TOOL INFORMATION
Fuel Sender Wrench: P/N 07AAA-S0XA100
SOFTWARE INFORMATION
HDS Software Version: 2.004.004 or later
PGM-FI Software Versions or Later:
WARRANTY CLAIM INFORMATION
In warranty:
The normal warranty applies.
Failed Part: P/N 16015-53V-A50
Defect Code: 08103
Symptom Code: 09001
Skill Level: Repair Technician
DIAGNOSIS
1. Install the fuel pressure gauge:
^ Refer to steps 1 and 2 on page 11-437 of the 2004-06 TL Service Manual, or
^ Online, enter keyword FUEL PRESSURE, and select Fuel Pressure Test from the list.
2. Start the engine and let it idle for 2 minutes.
3. Turn off the engine. Check the fuel pressure gauge. (Pressure should be 380 to 430 kpa [55 to 63 psi].)
4. Monitor the fuel pressure reading. If the fuel pressure bleeds down quickly after the engine is turned off, go to REPAIR PROCEDURE. If the fuel pressure does not drop quickly, follow normal troubleshooting procedures for hard starting problems.
NOTE:
There is no specification for fuel pressure bleed rate. Many variables can affect fuel line pressure, such as the fuel pump and fuel injectors. A bad regulator will lose most of the fuel pressure in the first few minutes after shutting off the engine.
REPAIR PROCEDURE
1. Relieve the fuel pressure.
^ Refer to page 11-435 of the 2004-06 TL Service Manual, or
^ Online, enter keyword PRES RELIEVING, and select Fuel Pressure Relieving from the list.
2. Remove the fuel tank unit.
^ Refer to page 11-447 of the service manual, or
^ Online, enter keyword FUEL PUMP REP, and select Fuel Pump/Fuel Gauge Sending Unit Replacement from the list.
3. Remove the fuel tank unit from the case.
^ Disconnect the fuel tank sending unit connector.
^ Release the three clips, and then pull out the fuel tank unit from the case.
4. Release the clips, then remove the fuel pressure regulator mount from the fuel tank unit.
5. Remove the clip, then remove the fuel pressure regulator. Install the new regulator with new 0-rings. Reassemble the fuel tank unit.
6. Place the new gasket onto the tank body.
7. Align the marks on the fuel tank unit and the fuel tank. (See page 11-447, step 8 of the service manual.) Install the fuel tank unit into the tank without dislodging the gasket. Using hand pressure only, slide the fuel tank unit into the tank until it is seated properly.
8. Using the fuel sender wrench, torque the fuel tank locknut to 93 N.m (69 lb-ft).
NOTE:
Do not use the locknut to force the pump into the tank.
9. Reinstall all removed parts.
*10. Update the PGM-FI software in the ECM/PCM, using software version 2.004.004 or later. To update the PGM-FI software, refer to Service Bulletin 01-026, Updating Control Units/Modules.*
11. Do the idle learn procedure:
^ Make sure all electrical items (A/C, audio unit, defogger, lights, etc.) are off.
^ Start the engine, and let it warm up to its normal operating temperature (the cooling fans cycle twice).
^ Let the engine idle (throttle closed and all electrical items off) for 10 minutes.
12. Do the low-rpm CKP pattern learn procedure:
^ Test-drive the vehicle on a level road. With the A/T in the Sequential Sportshift mode and in second or third gear, or the M/T in second or third gear, decelerate (with the throttle fully closed) from an engine speed of 2,500 rpm down to 1,000 rpm.
^ Stop the vehicle, and put the transmission into Park or neutral. Set the parking brake. Do not turn the ignition off.
13. Connect the HDS to the DLC, and check the status of PULSER F/B LEARN:
^ On the Selection Menu, select PGM-FI.
^ On the Mode Menu, select Data List.
^ Check the value of PULSER F/B LEARN.
^ If the value is Completed, go to step 14.
^ If the value is Not Completed, be sure the engine is at normal operating temperature (the ECT SENSOR (1) value is 176 or higher), and repeat step 12.
14. Do the high-rpm CKP pattern learn:
NOTE:
The low-rpm CKP pattern learn must be completed before you do the high-rpm CKP pattern learn.
^ Test-drive the vehicle on a level road. With the the A/T in low gear, or the M/T in first gear, decelerate (with the throttle fully closed) from an engine speed of 5,000 rpm down to 3,000 rpm.
^ Stop the vehicle, and put the transmission into Park or neutral. Set the parking brake. Do not turn the ignition off.
15. Connect the HDS to the DLC (if not already connected), and check the status of PULSER FIB LEARN (HIGH RPM):
^ On the Selection Menu, select PGM-FI.
^ On the Mode Menu, select Data List.
^ Check the value of PULSER FIB LEARN (HIGH RPM).
^ If the value is Completed, you've completed the CKP pattern learn procedure.
^ If the value is Not Completed, be sure the engine is at normal operating temperature (the ECT SENSOR (1) value is 176 or higher), and repeat step 14.
16. Start the vehicle a couple times to make sure the symptom is repaired. If it is not, continue with normal troubleshooting procedures for hard starting problems.
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