Source reference 2003-05-51

Manufacturer communication — 2003 GMC FULL-SIZE UTILITIES (YUKON)

Reporter type: Manufacturer

Vehicles as recorded

2003 GMC FULL-SIZE UTILITIES (YUKON XL) This vehicle's overview →
2003 GMC FULL-SIZE UTILITIES (YUKON) This vehicle's overview →

What the manufacturer’s document says

03-06-03-001 ・ normal characteristic (no repair) ・ names no model (for full-size utilities)

Applies to

Applies to 2003 Silverado and Sierra pickups or full-size utilities with the 5.3L engine (VIN Z, RPO L59): owners may comment that the starter continues to run after the key is released.
the passage
Owners of some 2003 Silverado and Sierra pickups or full-size utilities with the 5.3L Engine (VIN Z -- RPO L59) may comment that the engine starter continues to run after the key is released.
The article gives the highlights of bulletin 03-06-03-001.
the passage
Refer to bulletin 03-06-03-001. These are the highlights.

Finding the cause

Possible causes

On these vehicles the PCM controls the starter relay, with input from the key switch; after 0.4 seconds of cranking a timer is activated in the PCM.
the passage
On these vehicles, the starter relay is controlled by the PCM, with input from the key switch. After 0.4 seconds of cranking, a timer is activated in the PCM.
Once the timer is active, the PCM continues to crank the starter even though the key is released, until the engine starts or a no-start time limit is reached.
the passage
Once this happens, even though the key is released, the PCM will continue to crank the starter until the engine starts or a no-start time limit is reached.
The fuel pump module may take several seconds to build fuel pressure, particularly after sitting overnight; the automatic crank feature ensures sufficient crank time even if the customer releases the ignition switch prematurely.
the passage
The fuel pump module may take several seconds to build fuel pressure, particularly after sitting overnight. The automatic crank feature ensures sufficient crank time even if the customer releases the ignition switch prematurely.

Correction

Caution

This is a normal condition and no repairs should be attempted for it.
the passage
This is a normal condition and no repairs should be attempted for this condition.

What is needed

Parts and materials: Not stated
Labor time: Not stated
Special tools: Not stated
Scan tool: Not stated

Only what the technical documents state. "Not stated" does not mean not needed.

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

Communication summary
キーを離した後もスターターが回る 5.3L エンジン（VIN Z -- RPO L59）を搭載した一部の 2003 Silverado および Sierra pickup またはフルサイズ utility の所有者から、キーを離した後もエンジンのスターターが回り続けるとの指摘があることがある。これは正常な状態であり、この状態に対して修理を試みてはならない。これらの車両では、スターターリレーは、キースイッチからの入力を受けて PCM が制御している。クランキングが 0.4 秒続くと、PCM 内のタイマーが作動する。いったんこうなると、キーを離しても、エンジンが始動するか、始動不能の制限時間に達するまで、PCM はスターターを回し続ける。燃料ポンプモジュールは、特に一晩置いた後は、燃圧が上がるまでに数秒かかることがある。自動クランキング機能は、ユーザーがイグニッションスイッチを早く離してしまっても、十分なクランキング時間を確保する。通知 03-06-03-001 を参照する。以上がその要点である。 Machine translation (unreviewed)
Starter Cranks After Key is Released Owners of some 2003 Silverado and Sierra pickups or full-size utilities with the 5.3L Engine (VIN Z -- RPO L59) may comment that the engine starter continues to run after the key is released. This is a normal condition and no repairs should be attempted for this condition. On these vehicles, the starter relay is controlled by the PCM, with input from the key switch. After 0.4 seconds of cranking, a timer is activated in the PCM. Once this happens, even though the key is released, the PCM will continue to crank the starter until the engine starts or a no-start time limit is reached. The fuel pump module may take several seconds to build fuel pressure, particularly after sitting overnight. The automatic crank feature ensures sufficient crank time even if the customer releases the ignition switch prematurely. Refer to bulletin 03-06-03-001. These are the highlights.
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Source

Source: GM TechLink
Source reference: 2003-05-51
Received by source: 2003-05-01
Incident date: Unknown

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