ICD-U40 download error with OSC board

[FUMIO]

Hello.
I have used PIC about 5 years with using CCS compiler, and
I have had this problem and tried to solve many times, but still can not.
So, would you give me advice?

<Problem is>
When I use crystal input hardware board (OSC1 & OSC2),
always ICD can download correctly, and it works well.
But, when I use CMOS OSC input hardware board (just use OSC1, open OSC2),
always CCS software shows the download error (can not find target device!!!).

This is not Hardware board issue, because my colleague develop the software with using ASM, and download it correctly with PIC writer. (http://akizukidenshi.com/catalog/g/gK-02018/)

Here, I inform you the test condition as below,

<Condition is>
ICD version:ICD-U40
CCS version:3.249

setting is as below,
#include <16F873A.h>
#fuses HS, NOWDT, NOPROTECT, PUT, BROWNOUT, NOLVP
#use delay (clock = 12000000)
...

[PCM programmer]

I don't have the ICD-U40, so I can't test this problem.

But let's think about it. What is the difference between a crystal and
an external oscillator ?

1. Is the oscillator running at +3.3v, but the PIC is running at +5v ?
That could cause a problem. The oscillator's high level output voltage
would not be within specification to work with the PIC.

2. Is the oscillator running at +5v, but is it only specified for TTL level
output levels ? (not CMOS). This could cause a problem. The oscillator
needs to be have +5v CMOS output levels. Sometimes oscillators
are called "TTL/CMOS compatible". That type will work.

3. The external oscillator has a "startup time" delay. In this ECS
data sheet, it shows the startup time for 12 MHz oscillator is 5 ms,
maximum:
http://www.ecsxtal.com/store/pdf/ecs-200x.pdf

The 16F873A data sheet says, in this section, that the typical duration
of the Oscillator Startup Timer (OST) is 1024 Tosc. For a 12 MHz crystal,
this is 85 usec.