Having a problem when applied shader to TMX tiled map

I’m having a problem when applied shader to TMX tiled map.
It won’t display the tiled map. But I also use the same shader for the sprite but it works fine.
Is there something wrong with my shader cause I’m very new to the shader.

This is a basic shader, It will darken the texture.

#if OPENGL
	#define SV_POSITION POSITION
	#define VS_SHADERMODEL vs_3_0
	#define PS_SHADERMODEL ps_3_0
#else
	#define VS_SHADERMODEL vs_4_0_level_9_1
	#define PS_SHADERMODEL ps_4_0_level_9_1
#endif

texture SpriteTexture;
sampler s0;
float ambient;

sampler2D SpriteTextureSampler = sampler_state
{
	Texture = <SpriteTexture>;
};

struct VertexShaderOutput
{
	float4 Position : SV_POSITION;
	float4 Color : COLOR0;
	float2 TextureCoordinates : TEXCOORD0;
};

float4 MainPS(VertexShaderOutput input) : COLOR
{
    float4 color = tex2D(s0, input.TextureCoordinates);
    color.r = color.r * ambient;
    color.g = color.g * ambient;
    color.b = color.b * ambient;
    return color;
}

technique SpriteDrawing
{
	pass P0
	{
		PixelShader = compile PS_SHADERMODEL MainPS();
	}
};

This is how I render Tiled map with shader.

mapRenderer.Draw(SceneManager.allScene[sceneController.ChoosingScene].map, cam.GetViewMatrix(), null, TestEffect);