Mechanics

ACURA TL FUSE PROBLEM

2000 Acura TL

2000 Acura TL 6 cyl Front Wheel Drive Automatic 168000 miles

My car was driving good and it sat for a day and all of a sudden I went out to start it and it wouldn't turn over. The key light is blinking.
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Leceydee
December 20, 2008.



Hi leceydee,

Seems the immobilizer has been triggered resulting in the vehicle not starting.

DESCRIPTION & OPERATION

Immobilizer system is designed to disable vehicle when an incorrect ignition key is used. Immobilizer system consists of a transponder located in ignition key, immobilizer receiver, immobilizer indicator light and Powertrain Control Module (PCM).


http://www.2carpros.com/forum/automotive_pictures/192750_Immo00Acura3_1.jpg



When key is inserted into ignition switch and turned to ON (II) position, immobilizer receiver sends power to transponder in ignition key. Transponder sends a coded signal back through immobilizer receiver to the PCM. If the proper key was used, immobilizer indicator light will illuminate for 2 seconds, then go off. If key with an incorrect code or code was not received or recognized by the immobilizer receiver, indicator light will illuminate for 2 seconds, then blink until ignition switch is turned off. If ignition switch is turned off, indicator will blink for about 5 seconds to signal that immobilizer receiver has been set correctly, and then go off.

SYSTEM TESTS
NOTE: Program PCM using Honda PGM Tester. If vehicle does not start after programming PCM, perform the following tests.

IMMOBILIZER SYSTEM FUNCTION TEST
NOTE: On vehicles equipped with immobilizer system, engine start time will be slightly longer than on vehicles without immobilizer system.

1. Ensure transmission selector is in Park position and brake pedal is depressed. Insert key into ignition switch and turn to START position. System indicator light will illuminate for 2 seconds and go out. Engine should start.

2. If system indicator light begins to flash after 2 seconds or engine does not start, remove key and repeat starting procedure. If engine still does not start, perform IMMOBILIZER SYSTEM TEST .

IMMOBILIZER SYSTEM TEST
1. Using a scan tool, check for DTCs. If DTC D1607: MALFUNCTION IN PCM INTERNAL CIRCUIT is indicated, substitute a known-good PCM and retest system operation. If DTC D1607 is not indicated, go to next step.

2. Turn ignition switch to ON position. Verify if immobilizer indicator light illuminates. Indicator light should illuminate, then begin to blink. If indicator light operates correctly, go to next step. If indicator light does not operate correctly, check for open in Pink wire between immobilizer indicator light and PCM, a faulty immobilizer indicator light, or a blown fuse No. 13 (7.5-amp) located in passenger's under dash fuse/relay box.

3. Disconnect immobilizer receiver 5-pin connector. Turn ignition switch to ON position. Using DVOM, check voltage between immobilizer receiver connector terminal No. 1 and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check for blown fuse No. 1 (15-amp) located in driver's under dash fuse/relay box, blown fuse No. 46 (15-amp) located in underhood fuse/relay box, or an open in Yellow/Black wire between PGM-FI main relay and immobilizer receiver. Also check for a faulty PGM-FI main relay. PGM-FI relay is located under left side of instrument panel, between brake switch and top of parking brake pedal.

4. Check for continuity between ground and immobilizer receiver 5-pin connector terminal No. 4 (Brown/Black wire). If continuity exists, go to next step. If continuity does not exist, repair open in Brown/Black wire between immobilizer receiver and ground connector G101. Ground connector G101 is located on left side of engine, below intake air duct, next to radiator hose clamp.

5. Backprobing at PCM, check for continuity in Red wire between 20-pin PCM connector "E" terminal No. 2 and immobilizer receiver 5-pin connector terminal No. 2. If continuity exists, go to next step. If continuity does not exist, repair open in Red wire between PCM and immobilizer receiver.

6. Backprobing at PCM, check for continuity in Blue wire between 20-pin PCM connector "E" terminal No. 12 and immobilizer receiver 5-pin connector terminal No. 3. If continuity exists, replace immobilizer receiver. If continuity does not exist, repair open in Blue wire between PCM and immobilizer receiver.


KHLow2008
Dec 21, 2008.