Description and Troubleshooting of Electronic Throttle

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Description and Troubleshooting of Electronic Throttle:

Does anyone know exactly where the cable that leads from the gas pedal terminates? I'm guessing that it's one of the connectors on top of the engine, but which one exactly? Then I can check for a wire fault.

The accelerator pedal goes directly to the PCM module.

Conn-C1	PCM Conn/Pin	Color	Circuit
44	C29-A12	PP	APP2 Ground (722)
53	C29-B1	BR	APP1 Ground (719)
17	C29-B2	DB	APP1 Signal (718)
32	C27-C5	LB	APP2 SIgnal (721)
60	C27-D6	GY	APP3 Ground (725)
15	C27-D4	DG	APP3 Signal (724)
14	C27-D2	YL	APP3 +5V Reference (723)
20	C27-D12	WH	PP1 +5V Reference (717)
22	C28-C2	TN	APP2 +5V Reference (720)

As you can see, they are spread across three connectors (failsafe!) and each has a dedicated ground, and +5V reference.

DO the following tests:

1. Check on the accelerator unit:

PIN
D, G & E - Should all have +5V
A, B & J - Should have a ground
C, F & K - Should vary voltage from ground, to +5V reference.

The signals are also routed through connector C1, as shown above.

This information is for MY 2000 Turbo Diesel Hummers.

Peter H.

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